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 Status (UAOL0PCMS2STS) – Offset f188
This register reports the USB Audio Offload Link individual PCM stream operation status.
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 | 0h | RO/V | Output Free / Input Avail (OFIA) For output stream, this bit being a '1' indicates the FIFO has APS amount free space to accept TX data for subsequent service interval. For input stream, this bit being a '1' indicates the FIFO has received the service interval amount of RX data available. For output stream the reset value will indicate 0 for this field (Output Free), SW should treat the FIFO is free before the stream is enabled. This field will reflect correct status after the stream is enabled. |
| 30 | 0h | RO/V | Stream Busy (SBUSY) When set, it indicates that the stream is in operation. |
| 29 | 0h | RW/1C | FIFO Error (FIFOE) For output stream, this bit is always 0. For input stream, this bit will be set to '1' to indicate received Audio Payload Packet is greater than allocated FIFO. |
| 28:0 | 0h | RW/1C | Event Code x (EVCx) One bit per event code in the event notification message. Selected bit will be set to 1 per the indicated event code when an event notification message is received. |