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

2.1.4 CFG[1:0]

The CFG[1:0] can be used to adjust the TUSB1044 output voltage swing linear range and receiver equalization DC gain. Table 2-4 details the available options. For best performance, operate the TUSB1044 within its defined VOD linearity range. Keep the gain of the incoming VID to less than or equal to the TUSB1044 VOD linear range setting. This can be determined using Equation 1:

Equation 1. VID at 5 GHz=VOD×10-Gv20

where

  • Gv = TUSB1044 Gain
  • VOD = TUSB1044 VOD linearity setting

For example, for a VOD linearity range setting of 1200 mV, the maximum incoming VID signal at 5 GHz with a UEQ[1:0] setting of 5.2 dB is 1200 x (10–(5.2/20)) = 659 mVpp. The TUSB1044 can be operated outside its VOD linear range but jitter will be higher.

Table 2-4 TUSB1044 DC Gain and VOD Configuration
Setting #CFG1
Pin Level		CFG0
Pin Level		Downstream
DC Gain(dB)		Upstream
DC Gain (dB)		Downstream
VOD Linear Range (mVpp)		Upstream
VOD Linear Range (mVpp)
00010900900
10R01900900
20F00900900
30111900900
4R00011001100
5RR1011001100
6RF0111001100
7R12211001100
8F0ReservedReservedReservedReserved
9FRReservedReservedReservedReserved
10FF0013001300
11F1ReservedReservedReservedReserved
1210ReservedReservedReservedReserved
131RReservedReservedReservedReserved
141FReservedReservedReservedReserved
1511ReservedReservedReservedReserved

In the I2C mode, VOD can be controlled through I2C register 0x0C. For this reason, CFG[1:0] can be left unconnected.