Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
SoundWire x PCM Stream y Channel Map (SNDW3PCMS7CM) – Offset 48032
This register controls the SoundWire individual PCM FIFO port mapping to the streams and channels associated with the HD-A link DMA.
The total number of stream supported is declared in SNDWxPCMSCAP register, with the stream index ordering of input streams at the lowest, followed by output stream next, followed by bi-directional stream at the highest.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 15 | 0h | RW | Stream Direction (DIR) Indicates the link stream direction used by the FIFO port. |
| 14 | 0h | RO | Reserved (Preserved) (RSVD14) SW must preserve the original value when writing. |
| 13:8 | 0h | RW | Stream ID (STRM) An integer representing the link stream used by the FIFO port for data input or output. 00h is stream 0, 01h is stream 1, etc. Although the link is capable of transmitting any stream number, by convention stream 0 is reserved as unused so that FIFO port whose stream numbers have been reset to 0 do not unintentionally decode data not intended for them. |
| 7:4 | fh | RW | Highest Channel (HCHAN) An integer representing the highest channel used by the FIFO port. The FIFO port will use all channels between LCHAN and HCHAN (inclusive), for its data input or output. For mono channel operation, program LCHAN = HCHAN. |
| 3:0 | 0h | RW | Lowest Channel (LCHAN) An integer representing the lowest channel used by the FIFO port. The FIFO port will use all channels between LCHAN and HCHAN (inclusive), for its data input or output. For mono channel operation, program LCHAN = HCHAN. |