SEXT
Sign Extend (only for 16 bits slot)
0: Zeros or audio gain padding at LSB position
1: Sign extension at MSB position
When writing the bit is 0, the unused bits are audio gain for
13-bit linear sample and zeros padding for 8-bit companding
sample.
When writing the bit is 1, the unused bits are both sign
extension.
SW
Slot Width
0: 8 clocks width
1: 16 clocks width
Note: For A-law or u-law PCM sample, if this bit is set to 1,
eight zero bits are following with PCM sample.
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