Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
HD-A Link Control (HDALCTL) – Offset c44
This register controls the specific link.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:24 | 0h | RO | Reserved (Preserved) (RSVD31) SW must preserve the original value when writing. |
| 23 | 0h | RO/V | Current Power Active (CPA) This value changes to the value set by SPA when the power of the link has reached that state. Software sets SPA, then monitors CPA to know when the link has changed state. |
| 22:17 | 0h | RO | Reserved (Preserved) (RSVD22) SW must preserve the original value when writing. |
| 16 | 1h | RW/V | Set Power Active (SPA) Software sets this bit to '1' to turn the link on, and clears it to '0' when it wishes to turn the link off. When CPA matches the value of this bit, the achieved power state has been reached. Software is expected to wait for CPA to match SPA before it can program SPA again. Any deviation may result in undefined behavior. |
| 15:5 | 0h | RO | Reserved (Preserved) (RSVD15) SW must preserve the original value when writing. |
| 4 | 0h | RW | Offload Enable (OFLEN) When set to 1, it allows the link control to be offloaded to the DSP FW. The corresponding multi link segment control / status registers (and extended link control registers if exist) will be accessible by DSP FW (in addition to host SW). |
| 3:0 | 2h | RW | Set Clock Frequency (SCF) Indicates the frequency that software wishes the link to run at. |