The audio clock regeneration (ACR) interface has a Cycle Time Stamp (CTS) parameter vector and an Audio Clock Regeneration Value (N) parameter vector. Both vectors are 20 bits wide. The valid signal is driven High when the CTS and N parameters are stable. For more information, see Chapter 7 of the HDMI 1.4 specification.
On the rising edge of the valid signal, the TX reads the CTS and N parameters from the ACR input interface and transmits an audio clock regeneration packet.
The following table shows the Audio Clock Regeneration (ACR) interface
signals. This interface runs at the s_axis_audio_aclk clock rate.
| Name | I/O | Width | Description |
|---|---|---|---|
| acr_cts | I | 20 | CTS |
| acr_n | I | 20 | N |
| acr_valid | I | 1 | Valid |
If an HDMI system does not require audio, tie the following input ports Low:
- AUDIO_IN (except tready)
- s_axis_audio_aresetn
- s_axis_audio_aclk
- acr_cts
- acr_n
- acr_valid