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GS2970A Datasheet(PDF) 89 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 89 Page - Semtech Corporation |
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89 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 89 of 150 Figure 4-44:Sample Distribution over 5 Video Frames (525-line Systems) When the audio inputs are asynchronously switched or disrupted, the audio de-embedder continues to write audio samples into the audio buffer, based on the current five-frame sequence. The de-embedder then re-locks to the new 5-frame sequence, at which point a sample may be lost. NOTE: In SD, all four channel pairs must follow the same five-frame sequence. 4.19.3.3 Audio FIFO Block The function of the FIFO block is to change the audio data word rate from the ANC rate multiplexed with the video signal to the 48kHz audio output rate. The audio FIFO block contains the audio sample buffers; one per audio channel. Each buffer is 36 audio samples deep. At power up or reset, the read pointer is held at the zero position until 26 samples have been written into the FIFO (allows for 6 lines per frame with no audio samples; a maximum of 4 samples per line in SD Mode). See Figure 4-45. Figure 4-45:Audio Buffer After Initial 26 Sample Write The position of the write pointer with respect to the read pointer is monitored continuously. If the write pointer is less than 6 samples ahead of the read pointer (point A in Figure 4-46), a sample is repeated from the read-side of the FIFO. If the write pointer is less than 6 samples behind the read pointer (point B in Figure 4-46), a sample is dropped. This avoids buffer underflow/overflow conditions. Frame 1 1 e m a r F 5 e m a r F 4 e m a r F 3 e m a r F 2 e m a r F 5 e m a r F 1602 2 0 6 1 2 0 6 1 2 0 6 1 2 0 6 1 1601 1601 8008 Samples 1602 Repeat Audio Buffer 0 25 35 Read Pointer Write Pointer Address |
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