XMOS xCORE-200 Multi-channel Audio board Design Manual page 96

USB Audio Design Guide
Description Sample sub-slot size (bytes) of output stream Alternate 3 when running in
high-speed.
Default: 4 if resolution for Alternate 3 is 24bits, else resolution / 8
Note, the default catchs the 24bit special case where 4-byte subslot is nicer
for our 32-bit machine. Typically do not care about this extra bus overhead at
High-speed
Macro FS_STREAM_FORMAT_OUTPUT_1_SUBSLOT_BYTES
Description Sample sub-slot size (bytes) of output stream Alternate 1 when running in
full-speed.
Note, in full-speed mode bus bandwidth is at a premium, therefore pack samples
into smallest possible sub-slot.
Default: STREAM_FORMAT_OUTPUT_1_RESOLUTION_BITS / 8
Macro FS_STREAM_FORMAT_OUTPUT_2_SUBSLOT_BYTES
Description Sample sub-slot size (bytes) of output stream Alternate 2 when running in
full-speed.
Note, in full-speed mode bus bandwidth is at a premium, therefore pack samples
into smallest possible sub-slot.
Default: STREAM_FORMAT_OUTPUT_2_RESOLUTION_BITS / 8
Macro FS_STREAM_FORMAT_OUTPUT_3_SUBSLOT_BYTES
Description Sample sub-slot size (bytes) of output stream Alternate 3 when running in
full-speed.
Note, in full-speed mode bus bandwidth is at a premium, therefore pack samples
into smallest possible sub-slot.
Default: STREAM_FORMAT_OUTPUT_3_RESOLUTION_BITS / 8
Macro STREAM_FORMAT_OUTPUT_1_DATAFORMAT
Description Sample audio data-format if output stream Alternate 1.
Default: UAC_FORMAT_TYPEI_RAW_DATA when Alternate 1 is RAW/DSD else
UAC_FORMAT_TYPEI_PCM
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