Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 421

PCI-to-PCI Bridge Registers (D30:F0)
11.1.10 SMLT—Secondary Master Latency Timer Register
(PCI-PCI—D30:F0)
Offset Address: 1Bh
Default Value:
This timer controls the amount of time the PCH PCI-to-PCI bridge will burst data on its
secondary interface. The counter starts counting down from the assertion of FRAME#.
If the grant is removed, then the expiration of this counter will result in the deassertion
of FRAME#. If the grant has not been removed, then the PCH PCI-to-PCI bridge may
continue ownership of the bus.
Bit
7:3
2:0
11.1.11 IOBASE_LIMIT—I/O Base and Limit Register
(PCI-PCI—D30:F0)
Offset Address: 1Ch–1Dh
Default Value:
Bit
15:12
11:8
7:4
3:0
Datasheet
00h
Master Latency Timer Count (MLTC) — R/W. This 5-bit field indicates the number of
PCI clocks, in 8-clock increments, that the PCH remains as master of the bus.
Reserved
0000h
I/O Limit Address Limit bits[15:12] — R/W. I/O Base bits corresponding to address
lines 15:12 for 4-KB alignment. Bits 11:0 are assumed to be padded to FFFh.
I/O Limit Address Capability (IOLC) — RO. Indicates that the bridge does not
support 32-bit I/O addressing.
I/O Base Address (IOBA) — R/W. I/O Base bits corresponding to address lines 15:12
for 4-KB alignment. Bits 11:0 are assumed to be padded to 000h.
I/O Base Address Capability (IOBC) — RO. Indicates that the bridge does not
support 32-bit I/O addressing.
Attribute: R/W
Size: 8 bits
Description
Attribute: R/W, RO
Size: 16 bits
Description
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