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GS2970A Datasheet(PDF) 83 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 83 Page - Semtech Corporation |
83 / 150 page ![]() GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 83 of 150 4.19.2 Serial Audio Data Format Support The GS2970A supports the following serial audio data formats: •I2S (default) •AES/EBU • Serial Audio Left Justified, MSB First • Serial Audio Left Justified, LSB First • Serial Audio Right Justified, MSB First • Serial Audio Right Justified, LSB First (this mode is not supported in SD) By default (at power up or after system reset) I2S is selected. The other data formats are selectable via the host interface using the AMA/AMB[1:0] bits. The serial audio output formats may use LSB first according to the settings of the control bits LSB_FIRSTA, LSB_FIRSTB, LSB_FIRSTC, and LSB_FIRSTD. When in I2S mode, these control bits must all be set LOW (default). When I2S format is desired, both groups must be set to I2S (i.e. AMA = AMB = 11). This is because they share the same WCLK. Figure 4-36:I2S Audio Output Format Figure 4-37:AES/EBU Audio Output Format Table 4-17:Audio Output Formats AMA/AMB[1:0] Audio Output Format 00 AES/EBU audio output 01 Serial audio output: Left Justified; MSB first 10 Serial audio output: Right Justified; MSB first 11 I2S (Default) WCLK ACLK AOUT[8/7:2/1] MSB 0 3 21 2 3 4 5 6 22 LSB MSB 0 3 2 1 2 3 4 5 6 22 LSB Channel A (Left) Channel B (Right) WCLK ACLK AOUT[8/7:2/1] 12 3 4 LSB MSB 0 Channel A (Left) Channel B (Right) 56 7 8 27 29 28 30 31 123 4 0 5 6 7 8 27 29 28 30 31 AUX Preamble P C V U LSB MSB AUX Preamble P C VU |
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