82801DB Datasheet, PDF (294/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LPC Interface Bridge Registers (D31:F0)
9.1.4
9.1.5
PCISTA—PCI Device Status (LPC I/F—D31:F0)
Offset Address:
Default Value:
Lockable:
06–07h
0280h
No
Attribute:
Size:
Power Well:
R/WC, RO
16 bit
Core
Bit
Description
Detected Parity Error (DPE) — R/WC.
15 0 = This bit is cleared by software writing a 1 to the bit position.
1 = PERR# signal goes active. Set even if the PER bit is 0.
Signaled System Error (SSE) — R/WC.
0 = This bit is cleared by software writing a 1 to the bit position.
14 _{1 = Set by the Intel® ICH4 if the SERR_EN bit is set and the ICH4 generates an SERR# on function}
0. The ERR_STS register can be read to determine the cause of the SERR#. The SERR# can be
routed to cause SMI#, NMI, or interrupt.
Master Abort Status (RMA) — R/WC.
13 0 = This bit is cleared by software writing a 1 to the bit position.
1 = ICH4 generated a master abort on PCI due to LPC I/F master or DMA cycles.
Received Target Abort (RTA) — R/WC.
12 0 = This bit is cleared by software writing a 1 to the bit position.
1 = ICH4 received a target abort during LPC I/F master or DMA cycles to PCI.
Signaled Target Abort (STA) — R/WC.
11 ^{0 = This bit is cleared by software writing a 1 to the bit position.}
1 = ICH4 generated a target abort condition on PCI cycles claimed by the ICH4 for ICH4 internal
registers or for going to LPC I/F.
DEVSEL# Timing Status (DEV_STS) — RO.
10:9
01 = Medium Timing.
Data Parity Error Detected (DPED) — R/WC.
0 = This bit is cleared by software writing a 1 to the bit position.
8 ^{1 = Set when all three of the following conditions are true:}
- The ICH4 is the initiator of the cycle,
- The ICH4 asserted PERR# (for reads) or observed PERR# (for writes), and
- The PER bit is set.
7
Fast Back to Back Capable (FB2BC) — RO. Hardwired to 1. Indicates ICH4 as a target can accept
fast back-to-back transactions.
6 User Definable Features (UDF) — RO. Hardwired to 0
5 66 MHz Capable (66MHZ_CAP) — RO. Hardwired to 0
4:0 Reserved
REVID—Revision ID Register (LPC I/F—D31:F0)
Offset Address: 08h
Default Value: See Bit Description
Attribute:
Size:
RO
8 bits
Bit
Description
7:0
Revision Identification Value — RO. Refer to the Intel^® ICH4 specification update for the value of the
Revision ID Register.
294
Intel^® 82801DB ICH4 Datasheet