SNLS422D July   2012  – August 2017 DS90UB926Q-Q1

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  DC Electrical Characteristics
    6. 7.6  AC Electrical Characteristics
    7. 7.7  DC and AC Serial Control Bus Characteristics
    8. 7.8  Timing Requirements
    9. 7.9  Timing Requirements for the Serial Control Bus
    10. 7.10 Switching Characteristics
    11. 7.11 Timing Diagrams
    12. 7.12 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  High-Speed Forward Channel Data Transfer
      2. 8.3.2  Low-Speed Back Channel Data Transfer
      3. 8.3.3  Backward-Compatible Mode
      4. 8.3.4  Input Equalization Gain
      5. 8.3.5  Common-Mode Filter Pin (CMF)
      6. 8.3.6  Video Control Signal Filter
      7. 8.3.7  EMI Reduction Features
        1. 8.3.7.1 Spread Spectrum Clock Generation (SSCG)
      8. 8.3.8  Enhanced Progressive Turnon (EPTO)
      9. 8.3.9  LVCMOS VDDIO Option
      10. 8.3.10 Power Down (PDB)
      11. 8.3.11 Stop Stream Sleep
      12. 8.3.12 Serial Link Fault Detect
      13. 8.3.13 Oscillator Output
      14. 8.3.14 Pixel Clock Edge Select (RFB)
      15. 8.3.15 Image Enhancement Features
        1. 8.3.15.1 White Balance
          1. 8.3.15.1.1 LUT Contents
          2. 8.3.15.1.2 Enabling White Balance
        2. 8.3.15.2 Adaptive HI-FRC Dithering
      16. 8.3.16 Internal Pattern Generation
      17. 8.3.17 Built-In Self Test (BIST)
        1. 8.3.17.1 BIST Configuration and Status
          1. 8.3.17.1.1 Sample BIST Sequence
        2. 8.3.17.2 Forward Channel And Back Channel Error Checking
      18. 8.3.18 I2S Receiving
        1. 8.3.18.1 I2S Jitter Cleaning
        2. 8.3.18.2 Secondary I2S Channel
          1. 8.3.18.2.1 MCLK
      19. 8.3.19 Interrupt Pin — Functional Description and Usage (INTB)
      20. 8.3.20 GPIO[3:0] and GPO_REG[8:4]
        1. 8.3.20.1 GPO_REG[8:4] Enable Sequence
    4. 8.4 Device Functional Modes
      1. 8.4.1 Clock-Data Recovery Status Flag (LOCK), Output Enable (OEN) and Output State Select (OSS_SEL)
      2. 8.4.2 Low Frequency Optimization (LFMODE)
      3. 8.4.3 Configuration Select (MODE_SEL)
      4. 8.4.4 Repeater Application
        1. 8.4.4.1 Repeater Connections
    5. 8.5 Programming
      1. 8.5.1 Serial Control Bus
    6. 8.6 Register Maps
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Display Application
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Transmission Media
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Up Requirements and PDB Pin
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 CML Interconnect Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Detailed Description

Overview

The DS90UB926Q-Q1 deserializer receives 35 bits of data over a single serial FPD-Link III pair operating up to 2.975-Gbps application payload. The serial stream contains an embedded clock, video control signals, and the DC-balanced video data and audio data which enhance signal quality to support AC coupling.

The DS90UB926Q-Q1 deserializer attains lock to a data stream without the use of a separate reference clock source, which greatly simplifies system complexity and overall cost. The deserializer also synchronizes to the serializer regardless of the data pattern, delivering true automatic plug and lock performance. It can lock to the incoming serial stream without the need of special training patterns or sync characters. The deserializer recovers the clock and data by extracting the embedded clock information, validating then deserializing the incoming data stream. The recovered parallel LVCMOS video bus is then provided to the display. The deserializer is intended for use with the DS90UB925Q-Q1 serializer, but is also backward-compatible with DS90UR905Q or DS90UR907Q FPD-Link II serializer.

Functional Block Diagram

DS90UB926Q-Q1 30143428.gif

Feature Description

High-Speed Forward Channel Data Transfer

The High-Speed Forward Channel (HS_FC) is composed of 35 bits of data containing DIN[23:0] or RGB[7:0] or YUV data, sync signals, I2C, and I2S audio transmitted from Serializer to Deserializer. Figure 12 shows the serial stream per PCLK cycle. This data payload is optimized for signal transmission over an AC-coupled link. Data is randomized, balanced, and scrambled.

DS90UB926Q-Q1 30143437.gif Figure 12. FPD-Link III Serial Stream

The device supports clocks in the range of 5 MHz to 85 MHz. The application payload rate is 2.975 Gbps maximum (175 Mbps minimum) with the actual line rate of 2.975 Gbps maximum and 525 Mbps minimum.

Low-Speed Back Channel Data Transfer

The low-speed backward channel (LS_BC) of the DS90UB926Q-Q1 provides bidirectional communication between the display and host processor. The information is carried back from the Deserializer to the Serializer per serial symbol. The back channel control data is transferred over the single serial link along with the high-speed forward data, DC balance coding and embedded clock information. This architecture provides a backward path across the serial link together with a high-speed forward channel. The back channel contains the I2C, CRC, and 4 bits of standard GPIO information with 10-Mbps line rate.

Backward-Compatible Mode

The DS90UB926Q-Q1 is also backward-compatible to DS90UR905Q and DS90UR907Q FPD Link II serializers at 15- to 65-MHz pixel clock frequencies. It receives 28 bits of data over a single serial FPD-Link II pair operating at the line rate of 420 Mbps to 1.82 Gbps. This backward-compatible mode is provided through the MODE_SEL pin (Table 9) or the configuration register (Table 11). In this mode, the minimum PCLK frequency is 15 MHz.

Input Equalization Gain

FPD-Link III input adaptive equalizer provides compensation for transmission medium losses and reduces the medium-induced deterministic jitter. It equalizes up to 10 meter STP cables with 3 connection breaks at maximum serialized stream payload rate of 2.975 Gbps.

Common-Mode Filter Pin (CMF)

The deserializer provides access to the center tap of the internal termination. A capacitor must be placed on this pin for additional common-mode filtering of the differential pair. This can be useful in high noise environments for additional noise rejection capability. A 0.1-μF capacitor has to be connected to this pin to Ground.

Video Control Signal Filter

When operating the devices in Normal Mode, the Video Control Signals (DE, HS, VS) have the following restrictions:

  • Normal Mode with Control Signal Filter Enabled: DE and HS — Only 2 transitions per 130 clock cycles are transmitted, the transition pulse must be 3 PCLK or longer.
  • Normal Mode with Control Signal Filter Disabled: DE and HS — Only 2 transitions per 130 clock cycles are transmitted, no restriction on minimum transition pulse.
  • VS — Only 1 transition per 130 clock cycles are transmitted, minimum pulse width is 130 clock cycles.

Video Control Signals are defined as low frequency signals with limited transitions. Glitches of a control signal can cause a visual display error. This feature allows for the chipset to validate and filter out any high-frequency noise on the control signals. See Figure 13.

DS90UB926Q-Q1 30143402.gif Figure 13. Video Control Signal Filter Waveform

EMI Reduction Features

Spread Spectrum Clock Generation (SSCG)

The DS90UB926Q-Q1 provides an internally generated spread-spectrum clock (SSCG) to modulate its outputs. Both clock and data outputs are modulated. This will aid to lower system EMI. Output SSCG deviations to ±2.5% (5% total) at up to 100-kHz modulations are available. This feature may be controlled by register. See Table 1, Table 2, and Table 11. Do not enable the SSCG feature if the source PCLK into the SER has a clock with spread spectrum already.

DS90UB926Q-Q1 30143465.gif Figure 14. SSCG Waveform

Table 1. SSCG Configuration
LFMODE = L (15 to 85 MHz)

SSCG CONFIGURATION (0x2C) LFMODE = L (15 to 85 MHz) SPREAD SPECTRUM OUTPUT
SSC[2] SSC[1] SSC[0] Fdev (%) Fmod (kHz)
L L L ±0.9 PCLK / 2168
L L H ±1.2
L H L ±1.9
L H H ±2.5
H L L ±0.7 PCLK / 1300
H L H ±1.3
H H L ±2
H H H ±2.5

Table 2. SSCG Configuration
LFMODE = H (5 to <15 MHz)

SSCG CONFIGURATION (0x2C) LFMODE = H (5 to <15 MHz) SPREAD SPECTRUM OUTPUT
SSC[2] SSC[1] SSC[0] Fdev (%) Fmod (kHz)
L L L ±0.5 PCLK / 628
L L H ±1.3
L H L ±1.8
L H H ±2.5
H L L ±0.7 PCLK / 388
H L H ±1.2
H H L ±2
H H H ±2.5

Enhanced Progressive Turnon (EPTO)

The deserializer LVCMOS parallel outputs timing are delayed. Groups of 8-bit R, G and B outputs switch in a different time. This minimizes the number of outputs switching simultaneously and helps to reduce supply noise. In addition, it spreads the noise spectrum out reducing overall EMI.

LVCMOS VDDIO Option

The deserializer parallel bus can operate with 1.8-V or 3.3-V levels (VDDIO) for target (display) compatibility. The 1.8-V levels offers a lower noise (EMI) and also a system power savings.

Power Down (PDB)

The Serializer has a PDB input pin to ENABLE or POWER DOWN the device. This pin can be controlled by the host or through the VDDIO, where VDDIO = 3 V to 3.6 V or VDD33. To save power disable the link when the display is not needed (PDB = LOW). When the pin is driven by the host, make sure to release it after VDD33 and VDDIO have reached final levels; no external components are required. In the case of driven by the VDDIO = 3 V to 3.6 V or VDD33 directly, a 10-kΩ resistor to the VDDIO = 3 V to 3.6 V or VDD33 , and a > 10-µF capacitor to the ground are required (see Figure 24).

Stop Stream Sleep

The deserializer enters a low power SLEEP state when the input serial stream is stopped. A STOP condition is detected when the embedded clock bits are not present. When the serial stream starts again, the deserializer then locks to the incoming signal and recover the data.

NOTE

In STOP STREAM SLEEP, the Serial Control Bus Registers values are retained.

Serial Link Fault Detect

The serial link fault detection is able to detect any of following 7 conditions

  1. cable open
  2. + to – short
  3. + short to GND
  4. - short to GND
  5. + short to battery
  6. - short to battery
  7. cable is linked incorrectly

If any one of the fault conditions occurs, The Link Detect Status is 0 (cable is not detected) on the Serial Control Bus Register bit 0 of address 0x1C Table 11. The link errors can be monitored though Link Error Count of the Serial Control Bus Register bit [4:0] of address 0x41 Table 11.

Oscillator Output

The deserializer provides an optional PCLK output when the input clock (serial stream) has been lost. This is based on an internal oscillator. The frequency of the oscillator may be selected. This feature is controlled by register Address 0x02, bit 5 (OSC Clock Enable). See Table 11.

Pixel Clock Edge Select (RFB)

The RFB determines the edge that the data is strobed on. If RFB is High (1), output data is strobed on the Rising edge of the PCLK. If RFB is Low (‘0’), data is strobed on the Falling edge of the PCLK. This allows for inter-operability with downstream devices. The deserializer output does not need to use the same edge as the Ser input. This feature may be controlled by register. See Table 11.

Image Enhancement Features

Several image enhancement features are provided. White balance LUTs allow the user to define and target the color temperature of the display. Adaptive Hi-FRC dithering enables the presentation of “true-color” images on an 18–bit color display.

White Balance

The white balance feature enables similar display appearance when using LCDs from different vendors. It compensates for native color temperature of the display, and adjusts relative intensities of R, G, and B to maintain specified color temperature. Programmable control registers are used to define the contents of three LUTs (8-bit color value for red, green and blue) for the white balance feature. The LUTs map input RGB values to new output RGB values. There are three LUTs, one LUT for each color. Each LUT contains 256 entries, 8 bits per entry with a total size of 6144 bits (3 x 256 x 8). All entries are readable and writable. Calibrated values are loaded into registers through the I2C interface (deserializer is a slave device). This feature may also be applied to lower color depth applications such as 18-bit (666) and 16-bit (565). White balance is enabled and configured through the serial control bus register.

LUT Contents

The user must define and load the contents of the LUT for each color (R,G, and B). Regardless of the color depth being driven (888, 666, 656), the user must always provide contents for 3 complete LUTs - 256 colors × 8 bits × 3 tables. Unused bits - LSBs -shall be set to 0 by the user.

When 24-bit (888) input data is being driven to a 24-bit display, each LUT (R, G and B) must contain 256 unique 8-bit entries. The 8-bit white balanced data is then available at the output of the DS90UB926Q-Q1 deserializer, and driven to the display.

When 18-bit (666) input data is being driven to an 18-bit display, the white balance feature may be used in one of two ways. First, simply load each LUT with 256, 8-bit entries. Each 8-bit entry is a 6-bit value (6 MSBs) with the 2 LSBs set to 00. Thus as total of 64 unique 6-bit white balance output values are available for each color (R, G, and B). The 6-bit white balanced data is available at the output of the DS90UB926Q-Q1 deserializer, and driven directly to the display.

Alternatively, with 6-bit input data the user may choose to load complete 8-bit values into each LUT. This mode of operation provides the user with finer resolution at the LUT output to more closely achieve the desired white point of the calibrated display. Although 8-bit data is loaded, only 64 unique 8-bit white balance output values are available for each color (R, G, and B). The result is 8-bit white balanced data. Before driving to the output of the deserializer, the 8-bit data must be reduced to 6-bit with an FRC dithering function. To operate in this mode, the user must configure the DS90UB926Q-Q1 to enable the FRC2 function.

Examples of the three types of LUT configurations described are shown in Figure 15

Enabling White Balance

The user must load all 3 LUTs prior to enabling the white balance feature. The following sequence must be followed by the user.

To initialize white balance after power-on (Table 3):

  1. Load contents of all 3 LUTs . This requires a sequential loading of LUTs - first RED, second GREEN, third BLUE. 256, 8-bit entries must be loaded to each LUT. Page registers must be set to select each LUT.
  2. Enable white balance

By default, the LUT data may not be reloaded after initialization at power-on.

An option does exist to allow LUT reloading after power-on and initial LUT loading (as described above). This option may only be used after enabling the white balance reload feature through the associated serial control bus register. In this mode the LUTs may be reloaded by the master controller through the I2C. This provides the user with the flexibility to refresh LUTs periodically , or upon system requirements to change to a new set of LUT values. The host controller loads the updated LUT values through the serial bus interface. There is no need to disable the white balance feature while reloading the LUT data. Refreshing the white balance to the new set of LUT data will be seamless - no interruption of displayed data.

It is important to note that initial loading of LUT values requires that all 3 LUTs be loaded sequentially. When reloading, partial LUT updates may be made.

DS90UB926Q-Q1 30143472.gif Figure 15. White Balance LUT Configurations

Table 3. White Balance Register Table

PAGE ADD (dec) ADD (hex) REGISTER NAME BIT(s) ACCESS DEFAULT (hex) FUNCTION DESCRIPTION
0 42 0x2A White Balance Control 7:6 RW 0x00 Page Setting 00: Configuration Registers
01: Red LUT
10: Green LUT
11: Blue LUT
5 RW White Balance Enable 0: White Balance Disable
1: White Balance Enable
4 RW 0: Reload Disable
1: Reload Enable
3:0 Reserved
1 0 – 255 00 – FF White Balance Red LUT FF:0 RW N/A Red LUT 256 8–bit entries to be applied to the Red subpixel data
2 0 – 255 00 – FF White Balance Green LUT FF:0 RW N/A Green LUT 256 8–bit entries to be applied to the Green subpixel data
3 0 – 255 00 – FF White Balance Blue LUT FF:0 RW N/A Blue LUT 256 8–bit entries to be applied to the Blue subpixel data

Adaptive HI-FRC Dithering

The adaptive FRC dithering feature delivers product-differentiating image quality. It reduces 24-bit RGB (8 bits per subpixel) to 18-bit RGB (6 bits per sub-pixel), smoothing color gradients, and allowing the flexibility to use lower cost 18-bit displays. Frame Rate Control (FRC) dithering is a method to emulate “missing” colors on a lower color depth LCD display by changing the pixel color slightly with every frame. FRC is achieved by controlling on and off pixels over multiple frames (Temporal). Static dithering regulates the number of on and off pixels in a small defined pixel group (Spatial). The FRC module includes both Temporal and Spatial methods and also Hi-FRC. Conventional FRC can display only 16,194,277 colors with 6-bit RGB source. “Hi-FRC” enables full (16,777,216) color on an 18-bit LCD panel. The “adaptive” FRC module also includes input pixel detection to apply specific Spatial dithering methods for smoother gray level transitions. When enabled, the lower LSBs of each RGB output are not active; only 18-bit data (6 bits per R,G and B) are driven to the display. This feature is enabled through the serial control bus register.

Two FRC functional blocks are available, and may be independently enabled. FRC1 precedes the white balance LUT, and is intended to be used when 24-bit data is being driven to an 18-bit display with a white balance LUT that is calibrated for an 18-bit data source. The second FRC block, FRC2, follows the white balance block and is intended to be used when fine adjustment of color temperature is required on an 18-bit color display, or when a 24-bit source drives an 18-bit display with a white balance LUT calibrated for 24-bit source data.

For proper operation of the FRC dithering feature, the user must provide a description of the display timing control signals. The timing mode, “sync mode” (HS, VS) or “DE only” must be specified, along with the active polarity of the timing control signals. All this information is entered to DS90UB926Q-Q1 control registers through the serial bus interface.

Adaptive Hi-FRC dithering consists of several components. Initially, the incoming 8-bit data is expanded to 9-bit data. This allows the effective dithered result to support a total of 16.7 million colors. The incoming 9-bit data is evaluated, and one of four possible algorithms is selected. The majority of incoming data sequences are supported by the default dithering algorithm. Certain incoming data patterns (black/white pixel, full on/off sub-pixel) require special algorithms designed to eliminate visual artifacts associated with these specific gray level transitions. Three algorithms are defined to support these critical transitions.

An example of the default dithering algorithm is illustrated in Figure 16. The 1 or 0 value shown in the table describes whether the 6-bit value is increased by 1 (1) or left unchanged (0). In this case, the 3 truncated LSBs are 001.

DS90UB926Q-Q1 30143473.gif Figure 16. Default FRC Algorithm

See Table 4 for recommended FRC settings dependant on 18/24–bit source, 18/24–bit white balance LUT, and 18/24–bit display.

Table 4. Recommended FRC settings

SOURCE WHITE BALANCE LUT DISPLAY FRC1 FRC2
24–bit 24–bit 24–bit Disabled Disabled
24–bit 24–bit 18–bit Disabled Enabled
24–bit 18–bit 18–bit Enabled Disabled
18–bit 24–bit 24–bit Disabled Disabled
18–bit 24–bit 18–bit Disabled Enabled
18–bit 18–bit 18–bit Disabled Disabled

Internal Pattern Generation

The DS90UB926Q-Q1 serializer supports the internal pattern generation feature. It allows basic testing and debugging of an integrated panel. The test patterns are simple and repetitive and allow for a quick visual verification of panel operation. As long as the device is not in power-down mode, the test pattern will be displayed even if no parallel input is applied. If no PCLK is received, the test pattern can be configured to use a programmed oscillator frequency. For detailed information, refer to AN-2198 Exploring the Internal Test Pattern Generation Feature of 720p FPD-Link III Devices (SNLA132).

Built-In Self Test (BIST)

An optional at-speed built-in self test (BIST) feature supports the testing of the high speed serial link and the low-speed back channel. This is useful in the prototype stage, equipment production, in-system test, and also for system diagnostics.

NOTE

BIST is not available in backward-compatible mode.

BIST Configuration and Status

The BIST mode is enabled at the deserializer by the pin select (Pin 44 BISTEN and Pin 16 BISTC) or configuration register (Table 11) through the deserializer. When LFMODE = 0, the pin-based configuration defaults to external PCLK or 33-MHz internal oscillator clock (OSC) frequency. In the absence of PCLK, the user can select the desired OSC frequency (default 33 MHz or 25 MHz) through the register bit. When LFMODE = 1, the pin based configuration defaults to external PCLK or 12.5MHz MHz internal oscillator clock (OSC) frequency.

When BISTEN of the deserializer is high, the BIST mode enable information is sent to the serializer through the Back Channel. The serializer outputs a test pattern and drives the link at speed. The deserializer detects the test pattern and monitors it for errors. The PASS output pin toggles to flag any payloads that are received with 1 to 35 bit errors.

The BIST status is monitored real time on PASS pin. The result of the test is held on the PASS output until reset (new BIST test or Power Down). A high on PASS indicates NO ERRORS were detected. A Low on PASS indicates one or more errors were detected. The duration of the test is controlled by the pulse width applied to the deserializer BISTEN pin. This BIST feature also contains a Link Error Count and a Lock Status. If the connection of the serial link is broken, then the link error count is shown in the register. When the PLL of the deserializer is locked or unlocked, the lock status can be read in the register. See Table 11.

Sample BIST Sequence

See Figure 17 for the BIST mode flow diagram.

  1. For the DS90UB925Q-Q1 and DS90UB926Q-Q1 FPD-Link III chipset, BIST Mode is enabled through the BISTEN pin of DS90UB926Q-Q1 FPD-Link III deserializer. The desired clock source is selected through BISTC pin.
  2. The DS90UB925Q-Q1 serializer is woken up through the back channel if it is not already on. The all zero pattern on the data pins is sent through the FPD-Link III to the deserializer. Once the serializer and the deserializer are in BIST mode and the deserializer acquires Lock, the PASS pin of the deserializer goes high and BIST starts checking the data stream. If an error in the payload (1 to 35) is detected, the PASS pin will switch low for one half of the clock period. During the BIST test, the PASS output can be monitored and counted to determine the payload error rate.
  3. To Stop the BIST mode, the deserializer BISTEN pin is set Low. The deserializer stops checking the data. The final test result is held on the PASS pin. If the test ran error free, the PASS output will be High. If there was one or more errors detected, the PASS output will be Low. The PASS output state is held until a new BIST is run, the device is RESET, or Powered Down. The BIST duration is user controlled by the duration of the BISTEN signal.
  4. The Link returns to normal operation after the deserializer BISTEN pin is low. Figure 18 shows the waveform diagram of a typical BIST test for two cases. Case 1 is error free, and Case 2 shows one with multiple errors. In most cases it is difficult to generate errors due to the robustness of the link (differential data transmission etc.), thus they may be introduced by greatly extending the cable length, faulting the interconnect, reducing signal condition enhancements ( Rx Equalization).
DS90UB926Q-Q1 30143343.gif Figure 17. BIST Mode Flow Diagram

Forward Channel And Back Channel Error Checking

While in BIST mode, the serializer stops sampling RGB input pins and switches over to an internal all-zero pattern. The internal all-zeroes pattern goes through scrambler, DC-balancing, and so forth, and goes over the serial link to the deserializer. The deserializer on locking to the serial stream compares the recovered serial stream with all-zeroes and records any errors in status registers and dynamically indicates the status on PASS pin. The deserializer then outputs a SSO pattern on the RGB output pins.

The back-channel data is checked for CRC errors once the serializer locks onto back-channel serial stream as indicated by link detect status (register bit 0x0C[0]). The CRC errors are recorded in an 8-bit register. The register is cleared when the serializer enters the BIST mode. As soon as the serializer exits BIST mode, the functional mode CRC register starts recording the CRC errors. The BIST mode CRC error register is active in BIST mode only and keeps the record of last BIST run until cleared or enters BIST mode again.

DS90UB926Q-Q1 30143364.gif Figure 18. Bist Waveforms

I2S Receiving

In normal 24-bit RGB operation mode, the DS90UB926Q-Q1 provides up to 3-bit of I2S. They are I2S_CLK, I2S_WC and I2S_DA, as well as the Master I2S Clock (MCLK). The audio is received through the forward video frame, or can be configured to receive during video blanking periods. A jitter cleaning feature reduces I2S_CLK output jitter to +/- 2ns.

I2S Jitter Cleaning

The DS90UB926Q-Q1 features a standalone PLL to clean the I2S data jitter supporting high end car audio systems. If I2S CLK frequency is less than 1MHz, this feature has to be disabled through the register bit I2S Control (0x2B) in Table 10

Secondary I2S Channel

In 18-bit RGB operation mode, the secondary I2S data (I2S_DB) can be used as the additional I2S audio channel in additional to the 3–bit of I2S. The I2S_DB is synchronized to the I2S_CLK. To enable this synchronization feature on this bit, set the MODE_SEL (Table 9) or program through the register bit (Table 11).

MCLK

The deserializer has an I2S Master Clock Output. It supports x1, x2, or x4 of I2S CLK Frequency. When the I2S PLL is disabled, the MCLK output is off. Table 5 below covers the range of I2S sample rates and MCLK frequencies. By default, all the MCLK output frequencies are x2 of the I2S CLK frequencies. The MCLK frequencies can also be enabled through the register bit [7:4] (I2S MCLK Output) of 0x3A shown in Table 11. To select desired MCLK frequency, write bit 7 (0x3A) = 1, then write to bit [6:4] accordingly.

Table 5. Audio Interface Frequencies

SAMPLE RATE
(kHz)
I2S DATA WORD SIZE
(BITS)
I2S CLK
(MHz)
MCLK OUTPUT
(MHz)
REGISTER 0x3A[6:4]'b
32 16 1.024 I2S_CLK x1 000
I2S_CLK x2 001
I2S_CLK x4 010
44.1 1.4112 I2S_CLK x1 000
I2S_CLK x2 001
I2S_CLK x4 010
48 1.536 I2S_CLK x1 000
I2S_CLK x2 001
I2S_CLK x4 010
96 3.072 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
192 6.144 I2S_CLK x1 010
I2S_CLK x2 011
I2S_CLK x4 100
32 24 1.536 I2S_CLK x1 000
I2S_CLK x2 001
I2S_CLK x4 010
44.1 2.117 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
48 2.304 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
96 4.608 I2S_CLK x1 010
I2S_CLK x2 011
I2S_CLK x4 100
192 9.216 I2S_CLK x1 011
I2S_CLK x2 100
I2S_CLK x4 101
32 32 2.048 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
44.1 2.8224 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
48 3.072 I2S_CLK x1 001
I2S_CLK x2 010
I2S_CLK x4 011
96 6.144 I2S_CLK x1 010
I2S_CLK x2 011
I2S_CLK x4 100
192 12.288 I2S_CLK x1 011
I2S_CLK x2 100
I2S_CLK x4 110

Interrupt Pin — Functional Description and Usage (INTB)

  1. On DS90UB925Q-Q1, set register 0xC6[5] = 1 and 0xC6[0] = 1
  2. DS90UB926Q-Q1 deserializer INTB_IN (pin 16) is set LOW by some downstream device.
  3. DS90UB925Q-Q1 serializer pulls INTB (pin 31) LOW. The signal is active low, so a LOW indicates an interrupt condition.
  4. External controller detects INTB = LOW; to determine interrupt source, read ISR register .
  5. A read to ISR will clear the interrupt at the DS90UB925Q-Q1, releasing INTB.
  6. The external controller typically must then access the remote device to determine downstream interrupt source and clear the interrupt driving INTB_IN. This would be when the downstream device releases the INTB_IN (pin 16) on the DS90UB926Q-Q1. The system is now ready to return to step (1) at next falling edge of INTB_IN.

GPIO[3:0] and GPO_REG[8:4]

In 18-bit RGB operation mode, the optional R[1:0] and G[1:0] of the DS90UB926Q-Q1 can be used as the general purpose IOs GPIO[3:0] in either forward channel (Outputs) or back channel (Inputs) application.

GPIO[3:0] Enable Sequence

See Table 6 for the GPIO enable sequencing.

  1. Enable the 18-bit mode either through the configuration register bit Table 11 on DS90UB925Q-Q1 only. DS90UB926Q-Q1 is automatically configured as in the 18-bit mode.
  2. To enable GPIO3 forward channel, write 0x03 to address 0x0F on DS90UB925Q-Q1, then write 0x05 to address 0x1F on DS90UB926Q-Q1.

Table 6. GPIO Enable Sequencing Table

NO. DESCRIPTION DEVICE FORWARD CHANNEL BACK CHANNEL
1 Enable 18-bit mode DS90UB925Q-Q1 0x12 = 0x04 0x12 = 0x04
DS90UB926Q-Q1 Auto Load from DS90UB925Q-Q1 Auto Load from DS90UB925Q-Q1
2 GPIO3 DS90UB925Q-Q1 0x0F = 0x03 0x0F = 0x05
DS90UB926Q-Q1 0x1F = 0x05 0x1F = 0x03
3 GPIO2 DS90UB925Q-Q1 0x0E = 0x30 0x0E = 0x50
DS90UB926Q-Q1 0x1E = 0x50 0x1E = 0x30
4 GPIO1 DS90UB925Q-Q1 0x0E = 0x03 0x0E = 0x05
DS90UB926Q-Q1 0x1E = 0x05 0x0E = 0x05
5 GPIO0 DS90UB925Q-Q1 0x0D = 0x93 0x0D = 0x95
DS90UB926Q-Q1 0x1D = 0x95 0x1D = 0x93

GPO_REG[8:4] Enable Sequence

GPO_REG[8:4] are the outputs only pins. They must be programmed through the local register bits. See Table 7 for the GPO_REG enable sequencing.

  1. Enable the 18-bit mode either through the configuration register bit Table 11 on DS90UB925Q-Q1 only. DS90UB926Q-Q1 is automatically configured as in the 18-bit mode.
  2. To enable GPO_REG8 outputs a 1 , write 0x90 to address 0x21 on DS90UB926Q-Q1.

Table 7. GPO_REG Enable Sequencing Table

NO. DESCRIPTION DEVICE LOCAL ACCESS LOCAL OUTPUT VALUE
1 Enable 18-bit mode DS90UB926Q-Q1 0x12 = 0x04
(on DS90UB925Q-Q1)
2 GPO_REG8 DS90UB926Q-Q1 0x21 = 0x90 1
0x21 = 0x10 0
3 GPO_REG7 DS90UB926Q-Q1 0x21 = 0x09 1
0x21 = 0x01 1
4 GPO_REG6 DS90UB926Q-Q1 0x20 = 0x90 0
0x20 = 0x10 1
5 GPO_REG5 DS90UB926Q-Q1 0x20 = 0x09 1
0x20 = 0x01 0
6 GPO_REG4 DS90UB926Q-Q1 0x1F = 0x90 1
0x1F = 0x10 0

Device Functional Modes

Clock-Data Recovery Status Flag (LOCK), Output Enable (OEN) and Output State Select (OSS_SEL)

When PDB is driven HIGH, the CDR PLL begins locking to the serial input and LOCK is TRI-STATE or LOW (depending on the value of the OEN setting). After the DS90UB926Q-Q1 completes its lock sequence to the input serial data, the LOCK output is driven HIGH, indicating valid data and clock recovered from the serial input is available on the parallel bus and PCLK outputs. The State of the outputs are based on the OEN and OSS_SEL setting (Table 8) or register bit (Table 11). See Figure 7.

Table 8. Output States

INPUTS OUTPUTS
SERIAL INPUT PDB OEN OSS_SEL LOCK PASS DATA, GPIO, I2S CLK
X 0 X X Z Z Z Z
X 1 0 0 L or H L L L
X 1 0 1 L or H Z Z Z
Static 1 1 0 L L L L/OSC (Register bit enable)
Static 1 1 1 L Previous Status L L
Active 1 1 0 H L L L
Active 1 1 1 H Valid Valid Valid

Low Frequency Optimization (LFMODE)

The LFMODE is set through the register (Table 11) or MODE_SEL Pin 24 (Table 9). It controls the operating frequency of the deserializer. If LFMODE is Low (default), the PCLK frequency is between 15 MHz and 85 MHz. If LFMODE is High, the PCLK frequency is between 5 MHz and <15 MHz. Please note when the device LFMODE is changed, a PDB reset is required.

Configuration Select (MODE_SEL)

Configuration of the device may be done through the MODE_SEL input pin, or through the configuration register bit. A pullup resistor and a pulldown resistor of suggested values may be used to set the voltage ratio of the MODE_SEL input (VR4) and VDD33 to select one of the other 10 possible selected modes. See Figure 19 and Table 9.

DS90UB926Q-Q1 30143441.gif Figure 19. MODE_SEL Connection Diagram

Table 9. Configuration Select (MODE_SEL)

NO. IDEAL RATIO
VR4/VDD33
IDEAL VR4
(V)
SUGGESTED RESISTOR R3 kΩ (1% tolerance) SUGGESTED RESISTOR R4 kΩ (1% tolerance) LFMODE(1) Repeater(2) BACKWARD
COMPATIBLE(3)
I2S CHANNEL B
(18–bit Mode)(4)
1 0 0 Open 40.2 L L L L
2 0.123 0.407 115 16.2 L L L H
3 0.167 0.552 121 24.3 L H L L
4 0.227 0.748 162 47.5 L H L H
5 0.291 0.960 137 56.2 H L L L
6 0.366 1.209 107 61.9 H L L H
7 0.458 1.510 113 95.3 H H L L
8 0.542 1.790 95.3 113 H H L H
9 0.611 2.016 73.2 115 L L H L
LFMODE: L = 15 to 85 MHz (Default); H = 5 to <15 MHz
Repeater: L = Repeater Off (Default); H = Repeater On
Backward Compatible: L = Backward Compatible Off (Default); H = Backward Compatible On to 905/907 (15 to 65 MHz)
I2S Channel B: L = I2S Channel B Off, Normal 24-bit RGB Mode (Default); H = I2S Channel B On, 18-bit RGB Mode with I2S_DB Enabled.

Repeater Application

The DS90UB925Q-Q1 and DS90UB926Q-Q1 can be configured to extend data transmission over multiple links to multiple display devices. Setting the devices into repeater mode provides a mechanism for transmitting to all receivers in the system.

In a repeater application, in this document, the DS90UB925Q-Q1 is referred to as the Transmitter or transmit port (TX), and the DS90UB926Q-Q1 is referred to as the Receiver (RX). Figure 20 shows the maximum configuration supported for Repeater implementations using the DS90UB925Q-Q1 (TX) and DS90UB926Q-Q1 (RX). Two levels of Repeaters are supported with a maximum of three Transmitters per Receiver.

DS90UB926Q-Q1 30143410.gif Figure 20. Maximum Repeater Application
DS90UB926Q-Q1 30143432.gif Figure 21. 1:2 Repeater Configuration

In a repeater application, the I2C interface at each TX and RX may be configured to transparently pass I2C communications upstream or downstream to any I2C device within the system. This includes a mechanism for assigning alternate IDs (Slave Aliases) to downstream devices in the case of duplicate addresses.

At each repeater node, the parallel LVCMOS interface fans out to up to three serializer devices, providing parallel RGB video data, HS/VS/DE control signals and, optionally, packetized audio data (transported during video blanking intervals). Alternatively, the I2S audio interface may be used to transport digital audio data between receiver and transmitters in place of packetized audio. All audio and video data is transmitted at the output of the Receiver and is received by the Transmitter..

Figure 21 provides more detailed block diagram of a 1:2 repeater configuration.

Repeater Connections

The Repeater requires the following connections between the Receiver and each Transmitter for Figure 22:

  1. Video Data – Connect PCLK, RGB and control signals (DE, VS, HS).
  2. I2C – Connect SCL and SDA signals. Both signals should be pulled up to VDD33 with 4.7-kΩ resistors.
  3. Audio – Connect I2S_CLK, I2S_WC, and I2S_DA signals.
  4. IDx pin – Each Transmitter and Receiver must have an unique I2C address.
  5. MODE_SEL pin – All Transmitter and Receiver must be set into the Repeater Mode.
  6. Interrupt pin– Connect DS90UB926Q-Q1 INTB_IN pin to DS90UB925Q-Q1 INTB pin. The signal must be pulled up to VDDIO.

DS90UB926Q-Q1 30143442.gif Figure 22. Repeater Connection Diagram

Programming

Serial Control Bus

The DS90UB926Q-Q1 is configured by the use of a serial control bus that is I2C protocol compatible. . Multiple deserializer devices may share the serial control bus since 16 device addresses are supported. Device address is set through the R1 and R2 values on IDx pin. See Figure 23.

The serial control bus consists of two signals and a configuration pin. The SCL is a Serial Bus Clock Input / Output. The SDA is the Serial Bus Data Input / Output signal. Both SCL and SDA signals require an external pullup resistor to VDD33. For most applications a 4.7-kΩ pullup resistor to VDD33 may be used. The resistor value may be adjusted for capacitive loading and data rate requirements. The signals are either pulled High, or driven Low.

DS90UB926Q-Q1 30143401.gif Figure 23. Serial Control Bus Connection

The configuration pin is the IDx pin. This pin sets one of 16 possible device addresses. A pullup resistor and a pulldown resistor of suggested values may be used to set the voltage ratio of the IDx input (VR2) and VDD33 to select one of the other 16 possible addresses. See Table 10.

Table 10. Serial Control Bus Addresses for IDx

NO. IDEAL RATIO
VR2 / VDD33
IDEAL VR2
(V)
SUGGESTED RESISTOR R1 kΩ (1% tol) SUGGESTED RESISTOR R2 kΩ (1% tol) ADDRESS 7'b ADDRESS 8'b APPENDED
1 0 0 Open 40.2 0x2C 0x58
2 0.123 0.406 124 17.4 0x2D 0x5A
3 0.151 0.500 107 19.1 0x2E 0x5C
4 0.181 0.597 133 29.4 0x2F 0x5E
5 0.210 0.694 113 30.1 0x30 0x60
6 0.240 0.791 137 43.2 0x31 0x62
7 0.268 0.885 102 37.4 0x32 0x64
8 0.303 0.999 115 49.9 0x33 0x66
9 0.344 1.137 102 53.6 0x34 0x68
10 0.389 1.284 115 73.2 0x35 0x6A
11 0.430 1.418 115 86.6 0x36 0x6C
12 0.476 1.572 56.2 51.1 0x37 0x6E
13 0.523 1.725 93.1 102 0x38 0x70
14 0.565 1.863 82.5 107 0x39 0x72
15 0.611 2.016 73.2 115 0x3A 0x74
16 0.677 2.236 57.6 121 0x3B 0x76

Register Maps

Table 11. Serial Control Bus Registers

ADD
(dec)
ADD
(hex)
Register Name Bit(s) Register
Type
Default
(hex)
Function Descriptions
0 0x00 I2C Device ID 7:1 RW Device ID 7–bit address of Deserializer
See Table 9
0 RW ID Setting I2C ID Setting
1: Register I2C Device ID (Overrides IDx pin)
0: Device ID is from IDx pin
1 0x01 Reset 7 RW 0x04 Remote Auto Power Down Remote Auto Power Down
1: Power down when no forward channel link is detected
0: Do not power down when no forward channel link is detected
6:3 Reserved
2 RW BC Enable Back channel enable
1: Enable
0: Disable
1 RW Digital RESET1 Reset the entire digital block including registers
This bit is self-clearing.
1: Reset
0: Normal operation
0 RW Digital RESET0 Reset the entire digital block except registers
This bit is self-clearing
1: Reset
0: Normal operation
2 0x02 Configuration [0] 7 RW 0x00 Output Enable LVCMOS Output Enable.
1: Enable
0: Disable. Tri-state Outputs
6 RW OEN and OSS_SEL Override Overrides Output Enable Pin and Output State pin
1: Enable override
0: Disable - no override
5 RW OSC Clock Enable OSC Clock Output Enable
If loss of lock OSC clock is output onto PCLK
0: Disable
1: Enable
4 RW Output Sleep State Select (OSS_SEL) OSS Select to Control Output State during Lock Low Period
1: Enable
0: Disable
3 RW Backward Compatible Mode Override Mode_Sel Backward compatible Mode Override Enable.
1: Use register bit "reg_02[2]" to set BC Mode
0: Use MODE_SEL option.
2 RW Backward Compatible Mode Select Backward Compatible Mode Select to DS90UR905Q and DS90UR907Q. If Reg_02[3] = 1
1: Backward Compatible is on
0: Backward Compatible is off
1 RW LFMODE Pin Override LFMODE Pin Override Enable
1: Use register bit "reg_02[0]" to set LFMODE
0: Use LFMODE Pin
0 RW LFMODE Low Frequency Mode Select
1: PCLK = 5 to <15 MHz
0: PCLK = 15 to 85 MHz
3 0x03 Configuration [1] 7 0xF0 Reserved
6 RW CRC Generator Enable CRC Generator Enable (Back Channel)
1: Enable
0: Disable
5 Reserved
4 RW Filter Enable HS, VS, DE two clock filter When enabled, pulses less than two full PCLK cycles on the DE, HS, and VS inputs will be rejected
1: Filtering enable
0: Filtering disable
3 RW I2C Pass-through I2C Pass-Through Mode
1: Pass-Through Enabled
0: Pass-Through Disabled
2 RW Auto ACK ACK Select
1: Auto ACK enable
0: Self ACK
1 Reserved
0 RW RRFB Pixel Clock Edge Select
1: Parallel Interface Data is strobed on the Rising Clock Edge.
0: Parallel Interface Data is strobed on the Falling Clock Edge.
4 0x04 BCC Watchdog Control 7:1 RW 0xFE BCC Watchdog Timer The watchdog timer allows termination of a control channel transaction, if it fails to complete within a programmed amount of time. This field sets the Bidirectional Control Channel Watchdog Timeout value in units of 2 milliseconds.
This field should not be set to 0
0 RW BCC Watchdog Timer Disable Disable Bidirectional Control Channel Watchdog Timer
1: Disables BCC Watchdog Timer operation
0: Enables BCC Watchdog Timer operation"
5 0x05 I2C Control [1] 7 RW 0x2E I2C Pass Through All I2C Pass-Through All Transactions
1: Enabled
0: Disabled
6:4 RW I2C SDA Hold Time Internal I2C SDA Hold Time
It configures the amount of internal hold time provided for the SDA input relative to the SCL input. Units are 50 ns.
3:0 RW I2C Filter Depth I2C Glitch Filter Depth
It configures the maximum width of glitch pulses on the SCL and SDA inputs that will be rejected. Units are 5 ns.
6 0x06 I2C Control [2] 7 R 0x00 Forward Channel Sequence Error Control Channel Sequence Error Detected It indicates a sequence error has been detected in forward control channel. It this bit is set, an error may have occurred in the control channel operation.
6 RW Clear Sequence Error It clears the Sequence Error Detect bit
This bit is not self-clearing.
5 Reserved
4:3 RW SDA Output Delay SDA Output Delay
This field configures output delay on the SDA output. Setting this value will increase output delay in units of 50 ns. Nominal output delay values for SCL to SDA are:
00 : 250 ns
01: 300 ns
10: 350 ns
11: 400 ns
2 RW Local Write Disable Remote Writes to Local Registers through Serializer (Does not affect remote access to I2C slaves at Deserializer)
1: Stop remote write to local device registers
0: remote write to local device registers
1 RW I2C Bus Timer Speed Speed up I2C Bus Watchdog Timer
1: Timer expires after approximately 50 ms
0: Timer expires after approximately 1 s
0 RW I2C Bus Timer Disable Disable I2C Bus Timer When the I2C Timer may be used to detect when the I2C bus is free or hung up following an invalid termination of a transaction. If SDA is high and no signalling occurs for approximately 1 s, the I2C bus is assumed to be free. If SDA is low and no signaling occurs, the device will try to clear the bus by driving 9 clocks on SCL
7 0x07 Remote Device ID 7:1 RW 0x18 Remote ID Remote ID
Configures the I2C Slave ID of the remote Serializer. A value of 0 in this field disables I2C access to remote Serializer. This field is automatically configured through the Serializer Forward Channel. Software may overwrite this value, but should also set the FREEZE DEVICE ID bit to prevent overwriting by the Forward Channel.
0 RW Freeze Device ID Freeze Serializer Device ID
1: Prevent auto-loading of the Serializer Device ID from the Forward Channel. The ID will be frozen at the value written.
0: Update
8 0x08 SlaveID[0] 7:1 RW 0x00 Target Slave Device ID0 7-bit Remote Slave Device ID 0
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID0, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
9 0x09 SlaveID[1] 7:1 RW 0x00 Target Slave Device ID1 7-bit Remote Slave Device ID 1
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID1, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
10 0x0A SlaveID[2] 7:1 RW 0x00 Target Slave Device ID2 7-bit Remote Slave Device ID 2
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID2, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
11 0x0B SlaveID[3] 7:1 RW 0x00 Target Slave Device ID3 7-bit Remote Slave Device ID 3
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID3, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
12 0x0C SlaveID[4] 7:1 RW 0x00 Target Slave Device ID4 7-bit Remote Slave Device ID 4
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID4, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
13 0x0D SlaveID[5] 7:1 RW 0x00 Target Slave Device ID5 7-bit Remote Slave Device ID 5
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID5, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
14 0x0E SlaveID[6] 7:1 RW 0x00 Target Slave Device ID6 7-bit Remote Slave Device ID 6
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID6, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
15 0x0F SlaveID[7] 7:1 RW 0x00 Target Slave Device ID7 7-bit Remote Slave Device ID 7
Configures the physical I2C address of the remote I2C Slave device attached to the remote Serializer. If an I2C transaction is addressed to the Slave Alias ID7, the transaction will be remapped to this address before passing the transaction across the Bidirectional Control Channel to the Serializer.
0 Reserved
16 0x10 SlaveAlias[0] 7:1 RW 0x00 ID[0] Match 7-bit Remote Slave Device Alias ID 0
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID0 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
17 0x11 SlaveAlias[1] 7:1 RW 0x00 ID[1] Match 7-bit Remote Slave Device Alias ID 1
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID1 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
18 0x12 SlaveAlias[2] 7:1 RW 0x00 ID[2] Match 7-bit Remote Slave Device Alias ID 2
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID2 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
19 0x13 SlaveAlias[3] 7:1 RW 0x10 ID[3] Match 7-bit Remote Slave Device Alias ID 3
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID3 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
20 0x14 SlaveAlias[4] 7:1 RW 0x00 ID[4] Match 7-bit Remote Slave Device Alias ID 4
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID4 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
21 0x15 SlaveAlias[5] 7:1 RW 0x00 ID[5] Match 7-bit Remote Slave Device Alias ID 5
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID5 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
22 0x16 SlaveAlias[6] 7:1 RW 0x00 ID[6] Match 7-bit Remote Slave Device Alias ID 6
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID6 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 RW Reserved
23 0x17 SlaveAlias[7] 7:1 RW 0x00 ID[7] Match 7-bit Remote Slave Device Alias ID 7
Configures the decoder for detecting transactions designated for an I2C Slave device attached to the remote Serializer. The transaction will be remapped to the address specified in the Slave ID7 register.
A value of 0 in this field disables access to the remote I2C Slave.
0 Reserved
28 0x1C General Status 7:4 RW 0x00 Reserved
3 R I2S Locked I2S Lock Status
0: I2S PLL controller not locked
1: I2S PLL controller locked to input I2S clock
2 Reserved
1 Reserved
0 R Lock Deserializer CDR, PLL's clock to recovered clock frequency
1: Deserializer locked to recovered clock
0: Deserializer not locked
29 0x1D GPIO0 Config 7:4 R 0xA0 Rev-ID Revision ID: 1010: Production Device
3 RW GPIO0 Output Value Local GPIO Output Value
This value is output on the GPIO pin when the GPIO function is enabled, the local GPIO direction is Output, and remote GPIO control is disabled.
2 RW GPIO0 Remote Enable Remote GPIO0 Control
1: Enable GPIO control from remote Serializer. The GPIO pin will be an output, and the value is received from the remote Deserializer.
0: Disable GPIO control from remote Serializer
1 RW GPIO0 Direction Local GPIO Direction
1: Input
0: Output
0 RW GPIO0 Enable GPIO Function Enable
1: Enable GPIO operation
0: Enable normal operation
30 0x1E GPIO2 and GPIO1 Config 7 RW 0x00 GPIO2 Output Value Local GPIO Output Value
This value is output on the GPIO when the GPIO function is enabled, the local GPIO direction is Output, and remote GPIO control is disabled.
6 RW GPIO2 Remote Enable Remote GPIO2 Control
1: Enable GPIO control from remote Serializer. The GPIO pin will be an output, and the value is received from the remote Deserializer.
0: Disable GPIO control from remote Serializer.
5 RW GPIO2 Direction Local GPIO Direction
1: Input
0: Output
4 RW GPIO2 Enable GPIO Function Enable
1: Enable GPIO operation
0: Enable normal operation
3 RW GPIO1 Output Value Local GPIO Output Value
This value is output on the GPIO when the GPIO function is enabled, the local GPIO direction is Output, and remote GPIO control is disabled.
2 RW GPIO1 Remote Enable Remote GPIO1 Control
1: Enable GPIO control from remote Serializer. The GPIO pin will be an output, and the value is received from the remote Deserializer.
0: Disable GPIO control from remote Serializer.
1 RW GPIO1 Direction Local GPIO Direction
1: Input
0: Output
0 RW GPIO1 Enable GPIO Function Enable
1: Enable GPIO operation
0: Enable normal operation
31 0x1F GPO_REG4 and GPO3 Config 7 RW 0x00 GPO_REG4 Output Value Local GPO_REG4 Output Value
This value is output on the GPO when the GPO function is enabled, the local GPO direction is Output, and remote GPO control is disabled.
6:5 Reserved
4 RW GPO_REG4 Enable GPO_REG4 Function Enable
1: Enable GPO operation
0: Enable normal operation
3 RW GPIO3 Output Value Local GPIO Output Value This value is output on the GPIO when the GPIO function is enabled, the local GPIO direction is Output, and remote GPIO control is disabled.
2 RW GPIO3 Remote Enable Remote GPIO3 Control
1: Enable GPIO control from remote Serializer. The GPIO pin will be an output, and the value is received from the remote Deserializer.
0: Disable GPIO control from remote Serializer.
1 RW GPIO3 Direction Local GPIO Direction
1: Input
0: Output
0 RW GPIO3 Enable GPIO Function Enable
1: Enable GPIO operation
0: Enable normal operation
32 0x20 GPO_REG6 and GPO_REG5 Config 7 RW 0x00 GPO_REG6 Output Value Local GPO_REG6 Output Value
This value is output on the GPO when the GPO function is enabled, the local GPO direction is Output, and remote GPO control is disabled.
6:5 Reserved
4 RW GPO_REG6 Enable GPO_REG6 Function Enable
1: Enable GPO operation
0: Enable normal operation
3 RW GPO_REG5 Output Value Local GPO_REG5 Output Value
This value is output on the GPO when the GPO function is enabled, the local GPO direction is Output, and remote GPO control is disabled.
2:1 Reserved
0 RW GPO_REG5 Enable GPO_REG5 Function Enable
1: Enable GPO operation
0: Enable normal operation
33 0x21 GPO8 and GPO7 Config 7 RW 0x00 GPO_REG8 Output Value Local GPO_REG8 Output Value
This value is output on the GPO when the GPO function is enabled, the local GPO direction is Output, and remote GPO control is disabled.
6:5 Reserved
4 RW GPO_REG8 Enable GPO_REG8 Function Enable
1: Enable GPO operation
0: Enable normal operation
3 RW GPO_REG7 Output Value Local GPO_REG7 Output Value
This value is output on the GPO when the GPO function is enabled, the local GPO direction is Output, and remote GPO control is disabled.
2:1 Reserved
0 RW GPO_REG7 Enable GPO_REG7 Function Enable
1: Enable GPO operation
0: Enable normal operation
34 0x22 Data Path Control 7 RW 0x00 Override FC Config 1: Disable loading of this register from the forward channel, keeping locally written values intact
0: Allow forward channel loading of this register
6 RW Pass RGB Setting this bit causes RGB data to be sent independent of DE. This allows operation in systems which may not use DE to frame video data or send other data when DE is deasserted. Note that setting this bit blocks packetized audio. This bit does not need to be set in DS90UB925 or in Backward Compatibility mode.
1: Pass RGB independent of DE
0: Normal operation
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
5 RW DE Polarity This bit indicates the polarity of the DE (Data Enable) signal.
1: DE is inverted (active low, idle high)
0: DE is positive (active high, idle low)
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
4 RW I2S_Gen This bit controls whether the Receiver outputs packetized Auxiliary/Audio data on the RGB video output pins.
1: Don't output packetized audio data on RGB video output pins
0: Output packetized audio on RGB video output pins.
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
3 RW I2S Channel B Enable Override 1: Set I2S Channel B Enable from reg_22[0]
0: Set I2S Channel B Enable from MODE_SEL pin
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
2 RW 18-bit Video Select 1: Select 18-bit video mode
0: Select 24-bit video mode
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
1 RW I2S Transport Select 1: Enable I2S Data Forward Channel Frame Transport
0: Enable I2S Data Island Transport
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
0 RW I2S Channel B Enable I2S Channel B Enable
1: Enable I2S Channel B on B1 output
0: I2S Channel B disabled
Note: this bit is automatically loaded from the remote serializer unless bit 7 of this register is set.
35 0x23 General Purpose Control 7 RW 0x10 Rx RGB Checksum RX RGB Checksum Enable Setting this bit enables the Receiver to validate a one-byte checksum following each video line. Checksum failures are reported in the STS register
6:5 Reserved
4 R Mode_Sel Mode Select is Done
3 R LFMODE Low Frequency Mode Status
2 R Repeater Repeater Mode Status
1 R Backward Backward Compatible Mode Status
0 R I2S Channel B I2S Channel B Status
36 0x24 BIST Control 7:4 0x08 Reserved
3 RW BIST Pin Config BIST Configured through Pin
1: BIST configured through pin
0: BIST configured through register bit
2:1 RW BIST Clock Source BIST Clock Source
00: External Pixel Clock
01: 33 MHz Oscillator
10: Reserved
11: 25 MHz Oscillator
0 RW BIST Enable BIST Control
1: Enabled
0: Disabled
37 0x25 BIST Error 7:0 R 0x00 BIST Error Count BIST Error Count
38 0x26 SCL High Time 7:0 RW 0x83 SCL High Time I2C Master SCL High Time
This field configures the high pulse width of the SCL output when the Deserializer is the Master on the local I2C bus. Units are 50 ns for the nominal oscillator clock frequency. The default value is set to provide a minimum 5us SCL high time with the internal oscillator clock running at 26 MHz rather than the nominal 20 MHz.
39 0x27 SCL Low Time 7:0 RW 0x84 SCL Low Time I2C SCL Low Time
This field configures the low pulse width of the SCL output when the De-Serializer is the Master on the local I2C bus. This value is also used as the SDA setup time by the I2C Slave for providing data prior to releasing SCL during accesses over the Bidirectional Control Channel. Units are 50 ns for the nominal oscillator clock frequency. The default value is set to provide a minimum 5us SCL low time with the internal oscillator clock running at 26 MHz rather than the nominal 20 MHz.
41 0x29 FRC Control 7 RW 0x00 Timing Mode Select Select display timing mode
0: DE only Mode
1: Sync Mode (VS,HS)
6 RW VS Polarity 0: Active High
1: Active Low
5 RW HS Polarity 0: Active High
1: Active Low
4 RW DE Polarity 0: Active High
1: Active Low
3 RW FRC2 Enable 0: FRC2 Disable
1: FRC2 Enable
2 RW FRC1 Enable 0: FRC1 Disable
1: FRC1 Enable
1 RW Hi-FRC 2 Disable 0: Hi-FRC2 Enable
1: Hi-FRC2 Disable
0 RW Hi-FRC 1 Disable 0: Hi-FRC1 Enable
1: Hi-FRC1 Disable
42 0x2A White Balance Control 7:6 RW 0x00 Page Setting 00: Configuration Registers
01: Red LUT
10: Green LUT
11: Blue LUT
5 RW White Balance Enable 0: White Balance Disable
1: White Balance Enable
4 RW LUT Reload Enable 0: Reload Disable
1: Reload Enable
3:0 Reserved
43 0x2B I2S Control 7 RW 0x00 I2S PLL I2S PLL Control
0: I2S PLL is on for I2S data jitter cleaning
1: I2S PLL is off. No jitter cleaning
6:1 Reserved
0 RW I2S Clock Edge I2S Clock Edge Select
0: I2S Data is strobed on the Rising Clock Edge
1: I2S Data is strobed on the Falling Clock Edge
44 0x2C SSCG Control 7:4 0x00 Reserved
3 RW SSCG Enable Enable Spread Spectrum Clock Generator
0: Disable
1: Enable
2:0 RW SSCG Selection SSCG Frequency Deviation:
When LFMODE = H
fdev fmod
000: ±0.7 CLK/628
001: ±1.3
010: ±1.8
011: ±2.5
100: ±0.7 CLK/388
101: ±1.2
110: ±2
111: ±2.5
When LFMODE = L
fdev fmod
000: ±0.9 CLK/2168
001: ±1.2
010: ±1.9
011: ±2.5
100: ±0.7 CLK/1300
101: ±1.3
110: ±2
111: ±2.5
58 0x3A I2S MCLK Output 7 RW 0x00 MCLK Override 1: Override divider select for MCLK
0: No override for MCLK divider
6:4 RW MCLK Frequency Select See Table 5
3:0 Reserved
65 0x41 Link Error Count 7:5 0x03 Reserved
4 RW Link Error Count Enable Enable serial link data integrity error count
1: Enable error count
0: Disable
3:0 RW Link Error Count Link error count threshold.
Counter is pixel clock based. clk0, clk1 and DCA are monitored for link errors, if error count is enabled, deserializer loose lock once error count reaches threshold. If disabled deserilizer loose lock with one error.
68 0x44 Equalization 7:5 RW 0x60 EQ Stage 1 Select EQ select value.
Used if adaptive EQ is bypassed.
000 Min EQ 1st Stage
001
010
011
100
101
110
111 Max EQ 1st Stage
4 Reserved
3:1 RW EQ Stage 2 Select EQ select value.
Used if adaptive EQ is bypassed.
000 Min EQ 2nd Stage
001
010
011
100
101
110
111 Max EQ 2nd Stage
0 RW Adaptive EQ 1: Disable adaptive EQ (to write EQ select values)
0: Enable adaptive EQ
86 0x56 CML Output 7:4 0x08 Reserved
3 RW CMLOUT+/- Enable 1: Disabled (Default)
0: Enabled
2:0 Reserved
100 0x64 Pattern Generator Control 7:4 RW 0x10 Pattern Generator Select Fixed Pattern Select
This field selects the pattern to output when in Fixed Pattern Mode. Scaled patterns are evenly distributed across the horizontal or vertical active regions. This field is ignored when Auto-Scrolling Mode is enabled. The following table shows the color selections in non-inverted followed by inverted color mode
0000: Reserved 0001: White/Black
0010: Black/White
0011: Red/Cyan
0100: Green/Magenta
0101: Blue/Yellow
0110: Horizontally Scaled Black to White/White to Black
0111: Horizontally Scaled Black to Red/Cyan to White
1000: Horizontally Scaled Black to Green/Magenta to White
1001: Horizontally Scaled Black to Blue/Yellow to White
1010: Vertically Scaled Black to White/White to Black
1011: Vertically Scaled Black to Red/Cyan to White
1100: Vertically Scaled Black to Green/Magenta to White
1101: Vertically Scaled Black to Blue/Yellow to White
1110: Custom color (or its inversion) configured in PGRS, PGGS, PGBS registers
1111: Reserved
3:1 Reserved
0 RW Pattern Generator Enable Pattern Generator Enable
1: Enable Pattern Generator
0: Disable Pattern Generator
101 0x65 Pattern Generator Configuration 7:5 0x00 Reserved
4 RW Pattern Generator 18 Bits 18-bit Mode Select
1: Enable 18-bit color pattern generation. Scaled patterns will have 64 levels of brightness and the R, G, and B outputs use the six most significant color bits.
0: Enable 24-bit pattern generation. Scaled patterns use 256 levels of brightness.
3 RW Pattern Generator External Clock Select External Clock Source
1: Selects the external pixel clock when using internal timing.
0: Selects the internal divided clock when using internal timing
This bit has no effect in external timing mode (PATGEN_TSEL = 0).
2 RW Pattern Generator Timing Select Timing Select Control
1: The Pattern Generator creates its own video timing as configured in the Pattern Generator Total Frame Size, Active Frame Size. Horizontal Sync Width, Vertical Sync Width, Horizontal Back Porch, Vertical Back Porch, and Sync Configuration registers.
0: the Pattern Generator uses external video timing from the pixel clock, Data Enable, Horizontal Sync, and Vertical Sync signals.
1 RW Pattern Generator Color Invert Enable Inverted Color Patterns
1: Invert the color output.
0: Do not invert the color output.
0 RW Pattern Generator Auto-Scroll Enable Auto-Scroll Enable:
1: The Pattern Generator will automatically move to the next enabled pattern after the number of frames specified in the Pattern Generator Frame Time (PGFT) register.
0: The Pattern Generator retains the current pattern.
102 0x66 Pattern Generator Indirect Address 7:0 RW 0x00 Indirect Address This 8-bit field sets the indirect address for accesses to indirectly-mapped registers. It should be written prior to reading or writing the Pattern Generator Indirect Data register.
See AN-2198 Exploring Int Test Patt Gen Feat of 720p FPD-Link III Devices (SNLA132)
103 0x67 Pattern Generator Indirect Data 7:0 RW 0x00 Indirect Data When writing to indirect registers, this register contains the data to be written. When reading from indirect registers, this register contains the read back value.
See AN-2198 Exploring Int Test Patt Gen Feat of 720p FPD-Link III Devices (SNLA132)
240 0xF0 RX ID 7:0 R 0x5F ID0 First byte ID code: _
241 0xF1 7:0 R 0x55 ID1 Second byte of ID code: U
242 0xF2 7:0 R 0x48 ID2 Third byte of ID code, Value will be either B.
243 0xF3 7:0 R 0x39 ID3 Fourth byte of ID code: 9
244 0xF4 7:0 R 0x32 ID4 Fifth byte of ID code: 2
245 0xF5 7:0 R 0x36 ID5 Sixth byte of ID code: 6