SLLA598 October   2022 TDP1204 , TMDS1204

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2HDMI2.1 Key Features
    1. 2.1 Bandwidth
    2. 2.2 Dynamic HDR
    3. 2.3 Auto Low-Latency Mode
    4. 2.4 Variable Refresh Rate
    5. 2.5 Quick Frame Transport
    6. 2.6 Quick Media Switching
    7. 2.7 Enhanced Audio Return Channel
  5. 3TDP1204 and TMDS1204
    1. 3.1 TMDS1204 Fan-Out Buffer
    2. 3.2 TMDS 1204 SIGDET_OUT
    3. 3.3 TMDS1204 DC Gain Adjustment
    4. 3.4 TDP1204 DDC Buffer
  6. 4Summary
  7. 5References

3.2 TMDS 1204 SIGDET_OUT

The TMDS1204 provides an input signal detect function as part of the power management feature. When standby is enabled and swap is disabled, the TMDS1204 looks for a signal on either IN_CLK (if HDMI 1.4 or 2.0) or IN_D2 (if HDMI 2.1). When standby is enabled and swap is enabled, the TMDS1204 looks for a signal on either IN_CLK (if HDMI 2.1) or IN_D2 (if HDMI 1.4 or 2.0). The TMDS1204 is fully functional when a signal is detected. If no signal is detected, then the device re-enters standby state waiting for a signal again. In the standby state, all of the TMDS outputs are in high-Z status.

When standby state is enabled, the TMDS1204 will assert the SIGDET_OUT pin low when the signal is detected on IN_CLK or IN_D2. Otherwise SIGDET_OUT pin is de-asserted when entering power down or standby state.