TDP0604 datasheet(29/65 Pages) TI

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Table 8-8. Source Termination Control in I2C mode

TX_AC_EN Register

TERM Register

TXTERM_AUTO_HDMI14

Source Termination

None

Parallel ≈ 300-Ω across P and N

Automatic. parallel ≈ 100-Ω across P and N

Automatic. HDMI 1.4. parallel ≈ 300-Ω across P and N

Automatic. HDMI 1.4. No termination if HDMI clock

frequency is ≤ fHDMI14_open.

Automatic. HDMI 1.4. Parallel ≈ 300-Ω across P and N

termination if HDMI clock frequency is ≥ fHDMI14_300.

Parallel ≈ 100-Ω across P and N

≈ 150-Ω to supply (VCC) on both P and N

Automatic. ≈ 150-Ω to supply (VCC) on both P and N

for HDMI 1.4. Otherwise ≈ 50-Ω to supply (VCC) on

both P and N.

≈ 50-Ω to supply (VCC) on both P and N

Table 8-9. Automatic Source Termination Control in Pin-Strap Mode

HDMI Mode

AC_EN pin

Source Termination

HDMI 1.4

None or parallel ≈ 300-Ω across P and N

depending on state of SCL/CFG0 pin

HDMI 2.0

Parallel ≈ 100-Ω across P and N

HDMI 1.4

≈ 150-Ω to supply (VCC) on both P and N

HDMI 2.0

≈ 50-Ω to supply (VCC) on both P and N

8.3.11.3 TX Slew Rate Control

The TDP0604 has the ability to slow down the TMDS output edge rates. In pin-strap mode the TX slew rate

can not be controlled. In I2C mode both clock and data lanes slew rate can be controlled from a register. Table

8-10 shows the supported settings for each slew rate register based on HDMI data rate. The TDP0604 must be

configured in limited redriver mode to control the TX slew rate.

Table 8-10. I2C Mode TX Slew Register Supported Settings

HDMI Datarate

SLEW_CLK register

SLEW_3G register

SLEW_6G register

HDMI 1.4

3'b000 through 3'b011

3'b010 through 3'b101

N/A

HDMI 2.0

3'b000 through 3'b011

N/A

3'b011 through 3'b110

8.3.11.4 TX Pre-Emphasis and De-Emphasis Control

The TDP0604 provides pre-emphasis and de-emphasis on the data lanes allowing the output signal pre-

conditioning to offset interconnect losses between the TDP0604 outputs and a TMDS receiver. Pre-emphasis

and de-emphasis is not implemented on the clock lane. There are two methods to implement pre-emphasis, pin

strapping or through I2C programming. TX pre-emphasis and de-emphasis control is only supported in limited

mode.

When using pin strap mode, the TXPRE pin controls four different global pre-emphasis and de-emphasis values

for all data lanes when TDP0604 is operating in HDMI 1.4 or HDMI 2.0. These pre-emphasis and de-emphasis

values are described in Table 8-11.

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TDP0604

SLLSFJ8 – DECEMBER 2021

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