Specification Sheet

Datasheet, Volume 2 of 2 395
PCI Express* Controller (x16) Registers
10
0h
RO
PCC: Reserved for Power Controller Control: 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 should 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.
The defined encodings are:
0: Power On
1: Power Off
If the Power Controller Implemented field in the Slot Capabilities register is set to 0b,
then writes to this field have no effect and the read value of this field is undefined.
9:8
0h
RO
PIC: Reserved Power Indicator Control: 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 should 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.
7:6
0h
RO
AIC: Reserved for Attention Indicator Control: Reserved for Attention Indicator
Control (AIC):
If an Attention Indicator is implemented, writes to this field set the Attention Indicator
to the written state. Reads of this field should 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. If the indicator is electrically controlled by chassis, the indicator is
controlled directly by the downstream port through implementation specific
mechanisms.
00:Reserved
01:On
10:Blink
11:Off
If the Attention Indicator Present bit in the Slot Capabilities register is 0b, this field is
permitted to be read only with a value of 00b.
5
0h
RO
HPIE: Reserved for Hot-plug Interrupt Enable: When set to 1b, this bit enables
generation of an interrupt on enabled hot-plug events Default value of this field is 0b.
If the Hot Plug Capable field in the Slot Capabilities register is set to 0b, this bit is
permitted to be read-only with a value of 0b.
4
0h
RO
CCI: Reserved for Command Completed Interrupt Enable: If Command Completed
notification is supported (as indicated by No Command Completed Support field of Slot
Capabilities Register), when set to 1b, this bit enables software notification when a
hot-plug command is completed by the Hot-Plug Controller.
Default value of this field is 0b.
If Command Completed notification is not supported, this bit should be hardwired to
0b.
3
0h
RO
PDCE: Presence Detect Changed Enable: When set to 1b, this bit enables software
notification on a presence detect changed event.
Bit
Range
Default &
Access
Field Name (ID): Description