SLLA612 august 2023 TMDS1204
CTLEMAP_SEL: The TMDS1204 in pin-strap mode has three CTLE HDMI Data rate Maps: Map A, Map B, and Map C. Map A and C must be used if TMDS1204 is used in a source application and Map B for a sink application.
| CTLEMAP_SEL PIN Setting | ||||
|---|---|---|---|---|
| 0 | R | F | 1 | |
| CTLE Data Rate Map | B | C | B | A |
Receiver equalization: The receiver equalizer is used to clean up inter-symbol interference (ISI) jitter. TMDS1204 supports fixed receiver equalizer by setting the EQ0 and EQ1 pins in pin-strap mode or through I2C register. TMDS1204 also supports adaptive equalization (AEQ) for HDMI2.1 FRL as determined by the MODE pin configuration. The adaptive equalization starts when FRL link training begins. It will also re-adapt each time the data rate changes. The adaption will only occur during the TXFFE0 portion of FRL link training when LTP5, LTP6, LTP7, or LTP8 is being received.
DC Gain:The TMDS1204 has three sets of CTLE curves (3-Gbps CTLE, 6-Gbps CTLE, and 12-Gbps CTLE). This pin selects the DC gain setting to apply to each of the three sets of CTLE curves.
| DC Gain Pin Level | CTLE DC Gain |
|---|---|
| 0 | -3 dB |
| R | -3 dB |
| F | 0 dB |
| 1 | +1 dB |