12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
L1 Sub-States Capabilities (L1SCAP) – Offset 204
L1 Sub-States Capabilities
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:24 | 0x0 | RO | Reserved (RSVD_M) Reserved. |
23:19 | 0x5 | RW/O | Port Tpower_on Value (PTV) Along with the Port Tpower_on Scale field in the L1 Sub-states Capabilities register sets the time (in us) that this Port requires the port on the opposite side of Link to wait in L1.OFF_EXIT after sampling CLKREQ# asserted before actively driving the interface. |
18 | 0h | RO | Reserved |
17:16 | 0x0 | RW/O | Port Tpower_on Scale (PTPOS) Specifies the scale used for Tpower_on value field in the L1 Sub-states Capabilities register. |
15:8 | 0x28 | RW/O | Port Common Mode Restore Time (PCMRT) This is the time (in us) required for this Port to re-establish common mode. |
7 | 0h | RO | Reserved |
6 | 0x0 | RW/1C/V | CLKREQ# Acceleration Interrupt Status (L1SSEIS) For a Downstream Port that has both the CLKREQ# Acceleration Supported and CLKREQ# Acceleration Interrupt Enable bits Set, when set this bit indicates that the Port has completed the CLKREQ# Acceleration Link Activation process, and that the Link has reached L0. Software must then clear this bit by writing a 1b to this bit. |
5 | 0x0 | RW/O | CLKREQ# Acceleration Supported (L1SSES) When set this bit indicates that this Port supports CLKREQ# acceleration. |
4 | 0x1 | RW/O | L1 PM Sub-states Supported (L1PSS) When Set this bit indicates that this Port supports L1 PM Sub-states. |
3 | 0x1 | RW/O | ASPM L1.1 Supported (AL11S) When set, this bit indicates ASPM L1.SNOOZ is supported. |
2 | 0x1 | RW/O | ASPM L1.2 Supported (AL12S) When set, this bit indicates that ASPM L1.OFF is supported. |
1 | 0x1 | RW/O | PCI-PM L1.1 Supported (PPL11S) When set, this bit indicates that PCI-PM L1.SNOOZ is supported and this bit must be set by all ports implementing L1 Sub-States. A port that supports L1.OFF must support L1.SNOOZ. |
0 | 0x1 | RW/O | PCI-PM L1.2 Supported (PPL12S) When set, this bit indicates that PCI-PM L1.OFF is supported. |