Slot Capabilities (SLCAP) – Offset 54 - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

ID	Date	Version	Classification
834576	10/10/2024	001	Public

Slot Capabilities (SLCAP) – Offset 54

This is the Slot Capabilities registers. Refer description for each individual field below for more details of the register functionality.

Bit Range	Default	Access	Field Name and Description
31:19	0h	RW/O	Physical Slot Number (PSN) This is a value that is unique to the slot number. BIOS sets this field and it remains set until a platform reset.
18	1h	RW/O	No Command Completed Support (NCCS) Set to 1 as this port does not implement a Hot Plug controller and can handle back-2-back writes to all fields of the slot control register without delay between successive writes.
17	0h	RW/O	Electromechanical Interlock Present (EMIP) Indicates whether an Electromechanical Interlock is present for this slot. 0b: Indicates that an Electromechanical Interlock is not present. 1b: Indicates that an Electromechanical Interlock is present.
16:15	0h	RW/O	Slot Power Limit Scale (SLS) specifies the scale used for the slot power limit value. BIOS sets this field and it remains set until a platform reset.
14:7	0h	RW/O	Slot Power Limit Value (SLV) Specifies the upper limit (in conjunction with SLS value), on the upper limit on power supplied by the slot. The two values together indicate the amount of power in watts allowed for the slot. BIOS sets this field and it remains set until a platform reset.
6	1h	RW/O	Hot Plug Capable (HPC) When set, Indicates that hot plug is supported.
5	1h	RW/O	Hot Plug Surprise (HPS) When set, indicates the device may be removed from the slot without prior notification.
4	0h	RW/O	Power Indicator Present (PIP) Indicates that a power indicator LED is not present for this slot.
3	0h	RW/O	Attention Indicator Present (AIP) Indicates whether an Attention Indicator LED is present for this slot. 0b: Indicates that an Attention Indicator is not present. 1b: Indicates that an Attention Indicator is present.
2	0h	RW/O	MRL Sensor Present (MSP) Indicates whether an MRL Sensor is present for this slot. 0b: Indicates that an MRL Sensor is not present. 1b: Indicates that an MRL Sensor is present.
1	0h	RW/O	Power Controller Present (PCP) Indicates whether a Power Controller is implemented for this slot. 0b: Indicates that a Power Controller is not present. 1b: Indicates that a Power Controller is present.
0	0h	RW/O	Attention Button Present (ABP) Indicates whether an Attention Button is implemented for this slot. 0b: Indicates that an Attention Button is not present. 1b: Indicates that an Attention Button is present.