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USB Audio Design Guide 28/61

case FRAME_X :

// Store left

break ;

case FRAME_Z :

// Store right

break ;

}

3.12 ADAT Receive

The ADAT component receives up to eight channels of audio at a sample rate of

44.1kHz or 48kHz. The API for calling the receiver functions is described in §5.3.

The component outputs 32 bits words split into nine word frames. The frames are

laid out in the following manner:

· control byte

· channel 0 sample

· channel 1 sample

· channel 2 sample

· channel 3 sample

· channel 4 sample

· channel 5 sample

· channel 6 sample

· channel 7 sample

The following code is an example of code that could read the output of the ADAT

component:

control = i n uint ( oChan );

for ( int i = 0; i < 8; i ++) {

sample [i ] = inuint ( oChan );

}

The samples are 24-bit values contained in the lower 24 bits of the word. The

control word comprises four control bits in bits [11..8] and the value 0b00000001

in bits [7..0]. This enables synchronization at a higher level, in that on the channel

a single odd word is always read followed by eight words of data.

REV 6.1

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