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Hub Interface-to-PCI Bridge Registers (D30:F0)
7-4
82801AA and 82801AB ICH Datasheet
7.1.4
PD_STS—Primary Device Status Register
(HUB-PCI—D30:F0)
Offset Address:
Default Value:
06–07h
0080h
Attribute:
Size:
R/W
16 bits
For the writable bits in this register, writing a ‘1’ will clear the bit. Writing a ‘0’ to the bit will have
no effect.
Bit
Description
15
ICH (82801AA):
Detected Parity Error (DPE) —R/WC.
1 =This bit indicates that the ICH detected a parity error on the hub interface 1. This bit gets set
even if the Parity Error Response bit (bit 6 of offset 04) is not set.
0 = This bit is cleared by writing a ‘1’ to this location.
ICH0 (82801AB):
Detected Parity Error—RO. Hardwired to ‘0’
14
ICH (82801AA):
Received System Error (SSE)
—
R/W.
1 =The ICH sets this bit when an address, or command parity error, or special cycles data parity
error is detected on the PCI bus, and the Parity Error Response bit (D30:F0, Offset 04h, bit 6) is
set.
Note that if this bit is set because of parity error and the D30:F0 SERR_EN bit (Offset 04h, bit 8)
is also set, the ICH will generate an NMI (or SMI# if NMI routed to SMI#)
0 =This bit is cleared by software writing a 1.
ICH0 (82801AB):
Received System Error (SSE) — R/W.
1 =The ICH0 sets this bit when a system error occurs. Refer to
Section 5.1.4, “SERR#/PERR#/
NMI# Functionality” on page 5-2
for additional information.
0 =This bit is cleared by software writing a 1.
13
Received Master Abort (RMA) —R/WC.
1 = ICH received a master abort from the hub interface device (host controller).
0 = This bit is cleared by software writing a 1.
12
Received Target Abort (RTA) —R/WC.
1 = ICH received a target abort from the hub interface device (host controller). The TCO logic can
cause an SMI#, NMI, or interrupt based on this bit getting set.
0 = This bit is cleared by software writing a 1.
11
Signaled Target Abort (STA) —R/W.
1 = ICH signals a target abort condition on the hub interface. Note: an implementation simplification
is to set this bit along with the PCI (secondary) bus Received Target Abort bit during a
“completion required” access.
0 = This bit is cleared by software writing a 1.
10:9
DEVSEL# Timing Status—RO.
00h = Fast timing. This register applies to the hub interface; therefore, this field does not matter.
8
ICH (82801AA):
Data Parity Error Detected (DPD) —R/W
. With the PERR signal removed from the hub interface,
the ICH must interpret this bit differently than it is in the PCI spec.
1 = ICH (82801AA) detects a parity error on the hub interface and the Parity Error Response bit in
the Command Register (offset 04h, bit 6) is set.
0 = This bit is cleared by software writing a 1.
ICH0 (82801AB):
Data Parity Error Detected—RO. Hardwired to ‘0’.