12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
L1 Sub-States Control 1 (L1SCTL1) – Offset 208
L1 Sub-States Control 1
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:29 | 0x0 | RW | L1.2 LTR Threshold Latency Scale Value (L12LTRTLSV) This field contains the L1.OFF LTR Threshold Latency Scale Value for this particular Root Port. The value in this field, together with L12LTRTLV is compared against both the snoop and non-snoop LTR values of the device. |
28:26 | 0h | RO | Reserved |
25:16 | 0x0 | RW | L1.2 LTR Threshold Latency Value (L12LTRTLV) This field contains the L1.2 LTR Threshold Latency Value for this particular Root Port. The value in this field, together with L12LTRTLSV is compared against both the snoop and non-snoop LTR values of the device. |
15:8 | 0x0 | RW | Common Mode Restore Time (CMRT) This is the Tcommon_mode time(in us) the Root Port needs to continue sending TS1 and refrain from sending TS2 in Recovery state to allow the TX common mode to be established prior to sending TS2. The timer starts from the time when the first TS1 has been sent and the receiver has detected un-squelch. The value in this field defines the time in micro-seconds. |
7:6 | 0h | RO | Reserved |
5 | 0x0 | RW | L1 Substate Exit Control (L1SSEC) L1.Substate the Port must initiate the CLKREQ# Acceleration Link Activation process. Apart from that, once the Link reaches L0, the Port must continue to attempt to maintain the Link in L0 for as long as this bit remains Set. However if the Upstream Port request for L1 entry, the Downstream Port will proceed to allow L1 entry but will not re-enter L1.1 or L1.2. |
4 | 0x0 | RW | CLKREQ# Acceleration Interrupt Enable (L1SSEIE) When set this bit enables the generation of an interrupt to indicate the completion of the CLKREQ# acceleration Link Activation process |
3 | 0x0 | RW | ASPM L1.1 Enable (AL11E) When set, this bit indicates that ASPM L1.SNOOZ sub-states are enabled. |
2 | 0x0 | RW | ASPM L1.2 Enable (AL12E) When set, this bit indicates that ASPM L1.OFF substates are enabled. |
1 | 0x0 | RW | PCI-PM L1.1 Enable (PPL11E) When set, this bit indicates that PCI-PM L1.SNOOZ power management feature is enabled. If L1.OFF is enabled, L1.SNOOZ must also be enabled. |
0 | 0x0 | RW | PCI-PM L1.2 Enabled (PPL12E) When set, this bit indicates that PCI-PM L1.OFF power management feature is enabled. L1.OFF can only be enabled if the platform supports bi-directional CLKREQPLUS#. |