TDP0604 datasheet(27/65 Pages) TI

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When CTLEBYP_EN = 1 and dcGAIN = 0-dB, EQ settings 0 will be 0-dB due to the CTLE is bypassed.

Table 8-6. CTLE HDMI Datarate Map B and C

HDMI Mode

Map B

Map C

1.4

3 Gbps CTLE

6 Gbps CTLE

2.0

6 Gbps CTLE

Table 8-7. Pin-Strap Mode CTLE HDMI Datarate Mapping

Sampled State of CTLEMAP_SEL Pin

"0"

"R"

"F"

"1"

CTLE HDMI Datarate Map

Reserved

Map C

Reserved

Map B

Note

The clock lane EQ when operating in HDMI 1.4 or 2.0 will use the 3-Gbps CTLE and will be set to the

zero EQ setting.

8.3.9 CTLE Bypass

The TDP0604 will operate as a buffer when CTLE bypass is enabled. In pin-strap mode, this feature is disabled.

In I2C mode, this feature is enabled when CTLEBYP_EN = 1h and GLOBAL_DCG = 2h. Any lane that has EQ

setting of 0h that lane will operate in CTLE bypass.

8.3.10 Input Signal Detect

When standby is enabled, the TDP0604 looks for a signal on IN_CLK (SWAP disabled) or IN_D2 (SWAP

enabled) and is fully functional when a signal is detected. If no signal is detected, the device reenters standby

mode waiting for a signal again. In the standby state all of the TMDS outputs are in high-Z status. In both

pin-strap mode and I2C mode standby is enabled by default. In I2C mode standby can be disabled by setting the

STANDBY_DISABLE register.

8.3.11 Main Link Outputs

8.3.11.1 Transmitter Bias

The TDP0604 transmitter supports both external (DC-coupled) and internal bias (AC-coupled) to a receiver.

Selection between DC and AC-coupled is done through use of the AC_EN pin in pin-strap mode and TX_AC_EN

present. When AC_EN is greater than VIH, then TDP0604 transmitters are internally biased to approximately

VCC. For AC-coupled application, the AC_EN pin should be connected to greater than VIH and an external

ac-coupling capacitor should be placed on each of the OUT_D[2:0] pins and the OUT_CLK pin. If the AC_EN pin

is connected to less than VIL, then will inform TDP0604 it is DC-coupled (externally biased) to the far-end HDMI

compliant receiver.

Note

If using AC-coupled TX mode (AC_EN = high) in an HDMI source application, an external 499 Ω

pull-down to GND must be placed on each OUT pin (OUT_D2:0p/n and OUT_CLKp/n) between the

ac-coupling capacitor and the HDMI receptacle. The purpose of the 499 Ω resistor is to set the

common mode voltage to HDMI compliant levels. Refer to Figure 8-3.

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TDP0604

SLLSFJ8 – DECEMBER 2021

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