Intel G640T CM8062301002204 User Manual

Datasheet, Volume 2

177

PCI Express Slot related registers allow for the support of Hot Plug.

15:13

RO

0h

12

RO

0b

Uncore

(DLLSCE)
If the Data Link Layer Link Active capability is implemented, when 

set to 1b, this field enables software notification when Data Link 

Layer Link Active field is changed.
If the Data Link Layer Link Active capability is not implemented, 

this bit is permitted to be read-only with a value of 0b.

11

RO

0b

Uncore

Reserved for Electromechanical Interlock Control (EIC)
If an Electromechanical Interlock is implemented, a write of 1b to 

this field causes the state of the interlock to toggle. A write of 0b to 

this field has no effect. A read to this register always returns a 0.

10

RO

0b

Uncore

Reserved for Power Controller Control (PCC)
If a Power Controller is implemented, this field when written sets 

the power state of the slot per the defined encodings. Reads of this 

field must reflect the value from the latest write, even if the 

corresponding hotplug command is not complete, unless software 

issues a write without waiting for the previous command to 

complete in which case the read value is undefined.
Depending on the form factor, the power is turned on/off either to 

the slot or within the adapter. Note that in some cases the power 

controller may autonomously remove slot power or not respond to 

a power-up request based on a detected fault condition, 

independent of the Power Controller Control setting.
0 = Power On

1 = Power Off
If the Power Controller Implemented field in the Slot Capabilities 

register is set to 0b, writes to this field have no effect and the read 

value of this field is undefined.

9:8

RO

00b

Uncore

Reserved Power Indicator Control (PIC)
If a Power Indicator is implemented, writes to this field set the 

Power Indicator to the written state. Reads of this field must reflect 

the value from the latest write, even if the corresponding hot-plug 

command is not complete, unless software issues a write without 

waiting for the previous command to complete in which case the 

read value is undefined.
00 = Reserved
01 = On
10 = Blink
11 = Off
If the Power Indicator Present bit in the Slot Capabilities register is 

0b, this field is permitted to be read only with a value of 00b.