Intel B940 Datasheet Page 322

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Processor Configuration Registers
322 Datasheet, Volume 2
2.19.42 SLOTCTL—Slot Control Register
Note: Hot Plug is not supported on the platforms.
B/D/F/Type: 0/6/0/PCI
Address Offset: B8–B9h
Reset Value: 0000h
Access: RO, RW
Bit Attr
Reset
Value
Description
15:13 RO 000b Reserved
12 RO 0b
Reserved for Data Link Layer State Changed Enable (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
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
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.
The defined encodings are:
0b = Power On
1b = 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 RO 00b
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.
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