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GS2970A Datasheet(PDF) 90 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 90 Page - Semtech Corporation |
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90 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 90 of 150 Figure 4-46:Audio Buffer Pointer Boundary Checking The repeat or drop sample operation is performed a maximum of 28 consecutive times, after which the audio outputs are muted (all sample data set to zero). In SD Mode, 26 samples are required to be written into the FIFO prior to starting the read operation again. The audio buffer pointer offset may be reduced from 26 samples to 12 or 6 samples using the OS_SEL[1:0] bits in the host interface. The default setting is 26 samples (see Table 4-21). When the OS_SEL[1:0] bits are set for 6-sample pointer offset, no boundary-checking is performed. In HD mode the audio FIFO is a maximum of 10 samples deep. According to SMPTE 299M, audio samples are multiplexed immediately in the next HANC region after the audio sample occurs. Sample Delay When extracting SD audio, certain conditions can cause the sample delay through the audio FIFOs to be 1-4 samples different between channels. If delays through the audio FIFOs must be the same, it is recommended that the FIFO size gets set to 22 or 16 with OS_SEL[1:0]. Additionally, the audio FIFO must be cleared when either of the following occurs: 1. Loss of lock. The FIFO should be cleared when the part has relocked. 2. When one of the groups of audio disappears and re-appears. Poll the audio data packet detected registers ADPG1_DET, ADPG2_DET, ADPG3_DET, and ADPG4_DET Table 4-21:Audio Buffer Pointer Offset Settings OS_SEL[1:0] Buffer Pointer Offset 00 26 samples (default) 01 12 samples 10 6 samples Audio Buffer 0 29 35 Read Pointer Write Pointer Write Pointer A 5 B Address |
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