
Intel
82801BA ICH2 Datasheet
8-13
Hub Interface to PCI Bridge Registers (D30:F0)
8.1.28
PCI_MAST_STS—PCI Master Status Register
(HUB-PCI—D30:F0)
Offset Address:
Default Value:
82h
00h
Attribute:
Size:
R/WC
8 bits
8.1.29
ERR_CMD—Error Command Register (HUB-PCI—D30:F0)
Offset Address:
Default Value:
Lockable:
90h
00h
No
Attribute:
Size:
Power Well:
R/W
8-bit
Core
This register configures the ICH2’s Device 30 responses to various system errors. The actual
assertion of the internal SERR# (routed to cause NMI# or SMI#) is enabled via the PCI Command
register.
Bit
Description
7
Internal PCI Master Request Status (INT_MREQ_STS)—
R/WC.
1 = The ICH2’s internal DMA controller or LPC has requested use of the PCI bus.
0 = Software clears this bit by writing a 1 to the bit position.
6
Internal LAN Master Request Status (LAN_MREQ_STS)—
R/WC.
1 = The ICH2’s internal LAN controller has requested use of the PCI bus.
0 = Software clears this bit by writing a 1 to the bit position.
5:0
PCI Master Request Status (PCI_MREQ_STS)—
R/WC. Allows software to see if a particular bus
master has requested use of the PCI bus. For example, bit 0 will be set if ICH2 has detected
REQ[0]# asserted and bit 5 will be set if ICH2 detected REQ[5]# asserted.
1 = The associated PCI master has requested use of the PCI bus.
0 = Software clears these bits by writing a 1 to the bit position.
Bit
Description
7:3
Reserved.
2
SERR# enable on receiving target abort (SERR_RTA_EN)—
R/W.
1 = Enable. When SERR_EN is set, the ICH2 will report SERR# when SERR_RTA is set.
0 = Disable
1
SERR# enable on Delayed Transaction Time-out (SERR_DTT_EN)—
R/W.
1 = Enable. When SERR_EN is set, the ICH2 will report SERR# when SERR_DTT is set.
0 = Disable.
0
Reserved.
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