JAJSFO2I september   2012  – october 2020 SN65DSI83

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings #GUID-BDB96F65-5C5F-4805-AA4B-B71B15ADA38F/SLLSEB91839
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Clock Configurations and Multipliers
      2. 7.3.2 ULPS
      3. 7.3.3 LVDS Pattern Generation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Reset Implementation
      2. 7.4.2 Initialization Sequence
      3. 7.4.3 LVDS Output Formats
      4. 7.4.4 DSI Lane Merging
      5. 7.4.5 DSI Pixel Stream Packets
      6. 7.4.6 DSI Video Transmission Specifications
    5. 7.5 Programming
      1. 7.5.1 Local I2C Interface Overview
    6. 7.6 Register Maps
      1. 7.6.1 Control and Status Registers Overview
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Video STOP and Restart Sequence
      2. 8.1.2 Reverse LVDS Pin Order Option
      3. 8.1.3 IRQ Usage
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Example Script
      3. 8.2.3 Application Curve
  10. 9 Power Supply Recommendations
    1. 9.1 VCC Power Supply
    2. 9.2 VCORE Power Supply
  11. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Package Specific
      2. 10.1.2 Differential Pairs
      3. 10.1.3 Ground
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
  13.   Mechanical, Packaging, and Orderable Information

7.4.6 DSI Video Transmission Specifications

The SN65DSI83 device supports burst video mode and non-burst video mode with sync events or with sync pulses packet transmission as described in the DSI specification. The burst mode supports time-compressed pixel stream packets that leave added time per scan line for power savings LP mode. The SN65DSI83 device requires a transition to LP mode once per frame to enable PHY synchronization with the DSI host processor; however, for a robust and low-power implementation, the transition to LP mode is recommended on every video line.

Figure 7-12 shows the DSI video transmission applied to SN65DSI83 device applications. In all applications, the LVDS output rate must be less than or equal to the DSI input rate. The first line of a video frame shall start with a VSS packet, and all other lines start with VSE or HSS. The position of the synchronization packets in time is of utmost importance since this has a direct impact on the visual performance of the display panel; that is, these packets generate the HS and VS (horizontal and vertical sync) signals on the LVDS interface after the delay programmed into CHA_SYNC_DELAY_LOW/HIGH (CSR 0x28.7:0 and 0x29.3:0).

As required in the DSI specification, the SN65DSI83 device requires that pixel stream packets contain an integer number of pixels (that is, end on a pixel boundary); TI recommends to transmit an entire scan line on one pixel stream packet. When a scan line is broken in to multiple packets, inter-packet latency shall be considered such that the video pipeline (that is, pixel queue or partial line buffer) does not run empty (under-run); during scan line processing, if the pixel queue runs empty, the SN65DSI83 device transmits zero data (18’b0 or 24’b0) on the LVDS interface.

Note:

When the HS clock is used as a source for the LVDS pixel clock, the LP mode transitions apply only to the data lanes, and the DSI clock lane remains in the HS mode during the entire video transmission.

Note:

The SN65DSI83 device does not support the DSI virtual channel capability or reverse direction (peripheral to processor) transmissions.

GUID-B678C2E6-AE89-4B3B-8BF2-A70839AFEBD6-low.gifFigure 7-12 DSI Channel Transmission and Transfer Function