Intel
82801BA ICH2 Datasheet
14-3
AC’97 Modem Controller Registers (D31:F6)
14.1.4
PCISTA—Device Status Register (Modem—D31:F6)
Address Offset:
Default Value:
Lockable:
07h–06h
0280h
No
Attribute:
Size:
Power Well:
R/WC
16 bits
Core
PCISTA is a 16-bit status register. Refer to the PCI 2.1 specification for complete details on each
bit.
14.1.5
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
14.1.6
PI—Programming Interface Register (Modem—D31:F6)
Address Offset:
Default Value:
Lockable:
09h
00h
No
Attribute:
Size:
Power Well:
RO
8 bits
Core
Bit
Description
15
Detected Parity Error (DPE)—RO. Not implemented. Hardwired to 0.
14
SERR# Status (SERRS)—RO. Not implemented. Hardwired to 0.
13
Master-Abort Status (MAS)
—R/WC.
1 = Bus Master AC ‘97 interface function, as a master, generates a master abort.
0 = Software clears this bit by writing a 1 to the bit position.
12
Reserved. Read as “0”.
11
Signaled Target-Abort Status (STA)—RO. Not implemented. Hardwired to 0.
10:9
DEVSEL# Timing Status (DEVT)—RO
.
This 2-bit field reflects the ICH2's DEVSEL# timing
parameter. These read only bits indicate the ICH2's DEVSEL# timing when performing a positive
decode.
8
Data Parity Detected (DPD)—RO. Not implemented. Hardwired to 0.
7
Fast Back to back Capable (FBC)—RO. Hardwired to 1. This bit indicates that the ICH2 as a target is
capable of fast back-to-back transactions.
6
UDF Supported—RO. Not implemented. Hardwired to 0.
5
66 MHz Capable—RO. Hardwired to 0.
4:0
Reserved. Read as 0s.
Bit
Description
7:0
Revision ID Value
—RO.
Refer to the Specification Update for the value of the Revision ID
Register
Bit
Description
7:0
Programming Interface Value
—RO.
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