307013-003 Datasheet, PDF (351/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

PCI-to-PCI Bridge Registers (D30:F0)
9.1.10
SMLT—Secondary Master Latency Timer Register
(PCI-PCI—D30:F0)
Offset Address: 1Bh
Default Value: 00h
Attribute:
Size:
R/W, RO
8 bits
This timer controls the amount of time the ICH7 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 de-
assertion of FRAME#. If the grant has not been removed, then the ICH7 PCI-to-PCI
bridge may continue ownership of the bus.
9.1.11
Bit
Description
7:3
Master Latency Timer Count (MLTC) — R/W. This 5-bit field indicates the number of
PCI clocks, in 8-clock increments, that the Intel^® ICH7 remains as master of the bus.
2:0 Reserved
IOBASE_LIMIT—I/O Base and Limit Register
(PCI-PCI—D30:F0)
Offset Address: 1Ch-1Dh
Default Value: 0000h
Attribute:
Size:
R/W, RO
16 bits
Bit
Description
15:12
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.
11:8
7:4
3:0
II/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.
Intel ^® ICH7 Family Datasheet
351