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GS2970A Datasheet(PDF) 92 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 92 Page - Semtech Corporation |
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92 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 92 of 150 4.19.3.6 Audio Channel Status The GS2970A detects the AES/EBU Audio Channel Status (ACS) block information for each of the selected channel pairs. ACS data detection is indicated by corresponding ACS_DET flag bits in the host interface. The flag is cleared by writing to the same location. 4.19.3.7 Audio Channel Status Read AES/EBU ACS data is available separately for each of the channels in a stereo pair. The GS2970A defaults to reading the first channel of each pair. There are 184 bits in each ACS packet, which are written to twelve 16-bit right-justified registers in the host interface. The ACS_USE_SECOND bit (default LOW) selects the second channel in each audio pair when set HIGH. Once all of the ACS data for a channel has been acquired, the corresponding ACS_DET bit is set, and acquisition stops. The ACS data is overwritten with new data when the ACS_DET bit is cleared in the system. 4.19.3.8 Audio Channel Status Regeneration When the ACS_REGEN bit in the host interface is set HIGH, the audio de-embedder embeds the 24 bytes of the Audio Channel Status information programmed in the ACSR[183:0] registers into the 'C' bit of the AES/EBU outputs. The same Audio Channel Status information is used for all output channels. In order to apply ACSR data; • Set the ACS_REGEN bit to logic HIGH • Write the desired ACSR data to the ACSR registers • Set the ACS_APPLY bit to HIGH At the next status boundary, the device outputs the contents of the ACSR registers as ACS data. This event may occur at a different time for each of the output channels. While Table 4-23:Audio Sample Word Lengths ASWL[1:0] Audio Sample Word Length (SD) Audio Sample Word Length (HD) 00 24-bit 24-bit 01 20-bit 20-bit 10 16-bit 16-bit 11 Auto 24/20-bit (Default) Reserved (Default) NOTE: By default, at power-up, the word length is set to 12 bits. The desired word length should be programmed through the host interface. |
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