SLLA565 September   2021 TUSB1044

 

  1.   Trademarks
  2. 1Introduction
  3. 2TUSB1044 Configuration and Control Implementation
    1. 2.1 TUSB1044 Four-Level Pins
      1. 2.1.1 I2C_EN
      2. 2.1.2 VIO_SEL
      3. 2.1.3 UEQ[1:0] and DEQ[1:0]
      4. 2.1.4 CFG[1:0]
    2. 2.2 TUSB1044 Two-Level Pins
      1. 2.2.1 FLIP, CTL0, and CTL1
      2. 2.2.2 DIR0 and DIR1
      3. 2.2.3 SWAP
      4. 2.2.4 HPDIN
      5. 2.2.5 SLP_S0#
  4. 3TUSB1044 I2C Mode Implementation
    1. 3.1 TUSB1044 Operating Mode Configuration, General_1 Register, 0x0A
    2. 3.2 VOD Configuration, General_3 Register 0x0C
    3. 3.3 Upstream and Downstream Equalization Configuration Registers, UFP1_EQ, UFP2_EQ, DFP1_EQ, and DFP2_EQ Registers 0x10, 0x11, 0x20, 0x21
  5. 4Benefits of Using the I2C Mode Control
  6. 5TUSB1044 Host Implementation Example
  7. 6TPS6598X, TPS6599X Based I2C Control and Tuning
    1. 6.1 Enable PD Controller I2C Control of External Slaves
    2. 6.2 Example of I2C Configuration Upon PD Controller PoR Event and Detach Event
    3. 6.3 Example of I2C Configuration Upon Cable-Orientation Event and DP Configuration Event
    4. 6.4 Notes for Application
  8. 7References

6.3 Example of I2C Configuration Upon Cable-Orientation Event and DP Configuration Event

The TPS65994 takes over the PD communication to identify whether a USB, USB+DP, four-lane DP device is connected to alert the SOC and also to control the redriver, retimer, or MUX to the corresponding mode based on CC hand-shake results.

TUSB1044 control is based on the configuration to bit[2:0] of 0x0A. Consider a cable attach event with orientation (Attach_UU, Attach_UD, or cable orientation event) to trigger a USB3 configuration and MUX control after PD controller recognized the connection of external device.


GUID-20210707-CA0I-9PHC-WL8X-DCQ2SMZLCVZN-low.png

Figure 6-2 Example of USB3 Normal Orientation Configuration to TUSB1044

If the host (as DFP_D) and device (as UFP_D) establish the DP alternate mode connection, the host PD (usually with DFP_D pin C, D, E support based on notebook system design) will acknowledge the device supported pin assignment and preference on multifunction through the ACK message of the device-side PD controller. The PD controller finally selects one of the pin assignments and control or alert the TUSB1044 or SOC accordingly.


GUID-20210707-CA0I-SLQX-WKDG-M8RHTJKCTFCH-low.png

Figure 6-3 Example of Discover Mode ACK PD Message (Pin C, D as UFP_D Both Supported)

For a DP connection, there are two trigger events with DP pin A, C, or E, and pin B, D, or F depending on the DP alternate mode negotiation with the connected device.


GUID-20210707-CA0I-7CWV-SQTZ-RMJPWTFT5CFF-low.png

Figure 6-4 Example of a DP Pin A, C, or E Configuration to TUSB1044

Table 6-2 summarizes an example of control data and trigger events respectively.

Table 6-2 Reference TUSB1044 Control Register Setting
Connected Device, Flip Data Trigger Event
Unconnected 0x100A PoR, Detach
USB 0x110A cable_oriented (cable_attach_UU)
USB_Flip 0x150A cable_oriented (cable_attach_UD)
Pin B, D, F (for example, USB+DP) 0x130A DP Config BDF_UU
Pin B, D, F_Flip 0x170A DP Config BDF_UD
Pin A, C, E (for example, 4-lane DP) 0x120A DP Config ACE_UU
Pin A, C, E_Flip 0x160A DP Config ACE_UD

Considering the direction of data transmission, UEQ of the TUSB1044 influences the USB TX and DP test, while DEQ influences only the USB RX compliance test. If in a certain case USB TX and DP compliance require different EQ settings, use the USB3, DP select event as the trigger event to initiate a separate configuration to the EQs.

The PD Alternate Mode: DisplayPort application note provides a detailed introduction of DP alternate mode.