L1 Sub-States Capabilities (L1SCAP) – Offset 204 - 1.2 - ID:615146 | Intel® 400 Series Chipset On-Package Platform Controller Hub

Intel® 400 Series Chipset On-Package Platform Controller Hub

Online Register Database

ID	Date	Version	Classification
615146	08/09/2019	1.2	Public

L1 Sub-States Capabilities (L1SCAP) – Offset 204

Bit Range	Default	Access	Field Name and Description
30:24	-	-	Reserved
23:19	00101b	RW/O	Port Tpower_on Value (PTV) Along with the Port T_POWER_ON Scale Field in the L1 Substates Capabilities register sets theTime (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. Port Tpower_on is calculated by multiplying the value in this field by the value in the Port Tpower_on scale field in the L1 Sub-States Capabilities 2 register. Required for all Ports that support L1.OFF.
18	-	-	Reserved
17:16	00b	RW/O	Port Tpower_on Scale (PTPOS) Specifies the scale used for Tpower_on value field in the L1 Substates Capabilities register. D00b: 2 us D01b: 10 us D10b: 100 us D11b: Reserved Required for all Ports that support L1.OFF.
15:8	28h	RW/O	Port Common Mode Restore Time (PCMRT) This is the time (in us) required for this Port to re-establish common mode. Required for all ports that support L1.OFF.
7:5	-	-	Reserved
4	1b	RW/O	L1 PM Substates Supported (L1PSS) When Set this bit indicates that this Port supports L1 PM Substates. For compatibility with possible future extensions, software must not enable L1 PM Substates unless this bit is set. This RWO field must be programmed prior to enabling ASPM.
3	1b	RW/O	ASPM L1.1 Substates Supported (AL11S) When set, this bit indicates that this port supports L1 substates for ASPM L1.SNOOZ. Required for both Upstream and Downstream ports. This RWO field must be programmed prior to enabling ASPM. Register Attribute: Static
2	1b	RW/O	ASPM L1.2 Supported (AL12S) When set, this bit indicates that ASPM_L1.OFF is supported. Required for both Upstream and Downstream ports. This RWO field must be programmed prior to enabling ASPM. Register Attribute: Static
1	1b	RW/O	PCI-PM L1.1 Supported (PPL11S) When set, this bit indicates that L1.SNOOZ sub-state 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. Required for both upstream and downstream ports. This RWO field must be programmed prior to enabling ASPM. Register Attribute: Static
0	1b	RW/O	PCI-PM L1.2 Supported (PPL12S) When set, this bit indicates that L1.OFF power management feature is supported. Required for both upstream and downstream ports. This RWO field must be programmed prior to enabling ASPM. Register Attribute: Static