Audio Output Stream Interface - 3.1 English

HDMI 1.4/2.0 Receiver Subsystem Product Guide (PG236)

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3.1 English

The following table shows the signals for AXI4-Stream audio streaming interfaces. The audio interface transports 24-bits L-PCM or 16-bits HBR audio samples in the IEC 60958 format. A maximum of 32 channels are supported. The audio interface is a 32-bit AXI4-Stream master interface and runs at the s_axis_audio_aclk clock rate.

Table 1. Audio Output Stream Interface
Name I/O Width Description
s_axis_audio_aclk I 1 Clock (The audio streaming clock must be greater than or equal or greater than 128 times the audio sample frequency)
s_axis_audio_aresetn I 1 Reset (Active-Low)
AUDIO_OUT_tdata O 32 Data
  • [31] P (Parity)
  • [30] C (Channel status)
  • [29] U (User bit)
  • [28] V (Validity bit)
  • [27:4] Audio sample word
  • [27:4] Audio sample word for L-PCM/3D-Audio
  • [27:12] Audio sample word for HBR
  • [3:0] Preamble code
  • 4'b0001 Subframe 1/Left Channel and start of audio block
  • 4'b0010 Subframe 1/Left Channel
  • 4'b0011 Subframe 2/Right Channel
AUDIO_OUT_tid O 8 Channel ID
AUDIO_OUT_tready I 1 Ready
AUDIO_OUT_tvalid O 1 Valid