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TDP142

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SLLSEZ1C – SEPTEMBER 2017 – REVISED MAY 2019

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8.4 Device Functional Modes

8.4.1 Device Configuration in GPIO Mode

The TDP142 is in GPIO configuration when I2C_EN = “0”. The DPEN pin controls whether DisplayPort is

enabled and SNOOPENZ pin controls whether AUX snoop mode is enabled.

8.4.2 Device Configuration In I2C Mode

The TDP142 is in I2C mode when I2C_EN is not equal to “0”. The same configurations defined in GPIO mode

are also available in I2C mode. The TDP142 DisplayPort configuration is programmed based on the

Programming section .

8.4.3 Linear EQ Configuration

The receiver equalization gain value can be controlled either through I2C registers or through GPIOs. Table 2

details the gain value for each available combination when TDP142 is in GPIO mode. The I2C mode can do the

same option or even individual lane EQ setting by updating registers DP0EQ_SEL, DP1EQ_SEL, DP2EQ_SEL,

and DP3EQ_SEL.

Table 2. TDP142 Receiver Equalization GPIO Control

Equalization Setting #

ALL DISPLAYPORT LANES

DPEQ1 PIN LEVEL

DPEQ0 PIN LEVEL

EQ GAIN at 4.05 GHz (dB)

0

0

0

1.0

1

0

R

3.3

2

0

F

4.9

3

0

1

6.5

4

R

0

7.5

5

R

R

8.6

6

R

F

9.5

7

R

1

10.4

8

F

0

11.1

9

F

R

11.7

10

F

F

12.3

11

F

1

12.8

12

1

0

13.2

13

1

R

13.6

14

1

F

14.0

15

1

1

14.4