Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2
ID | Date | Version | Classification |
---|---|---|---|
834576 | 10/10/2024 | 001 | Public |
Link x Control (LCTL1) – Offset c84
This register controls the specific link.
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:24 | 0h | RO | Reserved (RSVD0) This is a Reserved Register |
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 (RSVD1) This is a Reserved Register |
16 | 1h | RW/V | Set Power Active (SPA) Software sets this bit to 1 to turn the link on (provided CRSTB = 1), 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.If GCTL.LPLE = 1, this bit will NOT be reset to 1 on CRST#=0 so that its value remain valid for low power mode (and operational if bit remains set)- if GCTL.LPLE = 0, this bit will be reset to 1 upon CRST# = 0 (for backward compatibility). |
15:4 | 0h | RO | Reserved (RSVD2) This is a Reserved Register |
3:0 | 4h | RW | Set Clock Frequency (SCF) Indicates the frequency that software wishes the link to run at. Changing this value to a value not supported by Link Capabilities shall result in indeterminate results. |