Processor Configuration Registers
Intel
®
Core
TM
i7-620LE/UE, i7-610E, i5-520E and Intel
®
Celeron
®
Processor P4500, P4505 Series
Datasheet Addendum
April 2010
126
Document Number: 323178-002
6.2.43
SLOTSTS - Slot Status
B/D/F/Type:
0/6/0/PCI
Address Offset:
BA-BBh
Default Value:
0000h
Access:
RO; RWC
Size:
16 bits
PCI Express Slot related registers allow for the support of Hot Plug.
Table 66. SLOTSTS - Slot Status Register (Sheet 1 of 2)
Bit
Access
Default
Value
RST/
PWR
Description
15:9
RO
0000000b
Core
Reserved and Zero
For future R/WC/S implementations; software must use 0 for
writes to bits.
8
RO
0b
Core
Reserved for Data Link Layer State Changed (DLLSC)
This bit is set when the value reported in the Data Link Layer
Link Active field of the Link Status register is changed. In
response to a Data Link Layer State Changed event, software
must read the Data Link Layer Link Active field of the Link Status
register to determine if the link is active before initiating
configuration cycles to the hot plugged device.
7
RO
0b
Core
Reserved for Electromechanical Interlock Status (EIS)
If an Electromechanical Interlock is implemented, this bit
indicates the current status of the Electromechanical Interlock.
Defined encodings are:
0b Electromechanical Interlock Disengaged
1b Electromechanical Interlock Engaged
6
RO
0b
Core
Presence Detect State (PDS)
In band presence detect state:
0b: Slot Empty
1b: Card present in slot
This bit indicates the presence of an adapter in the slot, reflected
by the logical “OR” of the Physical Layer in-band presence detect
mechanism and, if present, any out-of-band presence detect
mechanism defined for the slot's corresponding form factor. Note
that the in-band presence detect mechanism requires that power
be applied to an adapter for its presence to be detected.
Consequently, form factors that require a power controller for
hot-plug must implement a physical pin presence detect
mechanism.
Defined encodings are:
0b Slot Empty
1b Card Present in slot
This register must be implemented on all Downstream Ports that
implement slots. For Downstream Ports not connected to slots
(where the Slot Implemented bit of the PCI Express Capabilities
Register is 0b), this bit must return 1b.