82801DB Datasheet, PDF (495/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

AC ’97 Modem Controller Registers (D31:F6)
15.1.4
15.1.5
15.1.6
PCISTA—Device Status Register (Modem—D31:F6)
Address Offset:
Default Value:
Lockable:
06–07h
0290h
No
Attribute:
Size:
Power Well:
R/WC, RO
16 bits
Core
PCISTA is a 16-bit status register. Refer to the PCI 2.2 specification for complete details on each
bit.
Bit
Description
15 Detected Parity Error (DPE) — RO. Not implemented. Hardwired to 0.
14 Signaled System Error (SSE) — RO. Not implemented. Hardwired to 0.
Master Abort Status (MAS) — R/WC.
13 0 = Software clears this bit by writing a 1 to the bit position.
1 = Bus Master AC ‘97 interface function, as a master, generates a master abort.
12 Reserved. Read as 0.
11 Signaled Target Abort (STA) — RO. Not implemented. Hardwired to 0.
DEVSEL# Timing Status (DEV_STS) — RO. This 2-bit field reflects the ICH4's DEVSEL# timing
10:9 parameter. These read only bits indicate the ICH4's DEVSEL# timing when performing a positive
decode.
8 Data Parity Error Detected (DPED) — RO. Not implemented. Hardwired to 0.
7
Fast Back to Back Capable (FB2BC) — RO. Hardwired to 1. This bit indicates that the ICH4 as a
target is capable of fast back-to-back transactions.
6 User Definable Features (UDF) — RO. Not implemented. Hardwired to 0.
5 66 MHz Capable (66MHZ_CAP) — RO. Hardwired to 0.
4
Capabilities List (CAP_LIST) — RO. This field indicates that the controller contains a capabilities
pointer list. The first item is pointed to by looking at configuration offset 34h.
3:0 Reserved
RID—Revision Identification Register (Modem—D31:F6)
Address Offset:
Default Value:
Lockable:
08h
See Bit Description
No
Attribute:
Size:
Power Well:
RO
8 Bits
Core
Bit
Description
7:0
Revision Identification Value — RO. Refer to the ICH4 Specification Update for the value of the
Revision ID Register.
PI—Programming Interface Register (Modem—D31:F6)
Address Offset: 09h
Default Value: 00h
Lockable:
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
Bit
7:0 Programming Interface — RO.
Description
Intel^® 82801DB ICH4 Datasheet
495