Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
USB Audio Offload Link x PCM Stream y Fractional Rate Adjustment (UAOL0PCMS3RA) – Offset f1ac
This register controls the stream rate adjustment, if any.
The total number of stream supported is declared in UAOLxPCMSCAP 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 |
|---|---|---|---|
| 31:26 | 0h | RO | Reserved (Preserved) (RSVD31) SW must preserve the original value when writing. |
| 25 | 0h | RW | Feedback Adjustment Direction (FBADIR) Indicate the feedback adjustment direction. |
| 24 | 0h | RW/1S | Feedback Adjustment (FBADJ) When set to 1, it initiates an feedback based one time adjustment to the audio payload size of the next nearest service interval. HW will clear to 0 when the adjustment is completed. |
| 23 | 0h | RO | Reserved (Preserved) (RSVD23) SW must preserve the original value when writing. |
| 22:16 | 0h | RW | Fractional Adjustment Divider M (FCADIVM) Indicate the M value of the M/N divider rate adjustment, w.r.t. to the service interval cadence. |
| 15:9 | 0h | RO | Reserved (Preserved) (RSVD15) SW must preserve the original value when writing. |
| 8:0 | 0h | RW | Fractional Adjustment Divider N (FCADIVN) Indicate the N value of the M/N divider rate adjustment, w.r.t. to the service interval cadence. |