
82C814
912-3000-047
Revision: 1.0
Page 27
January 08, 1998
OPTi
PCICFG 30h
I/O Window 0 Limit Address Register - Byte 0: Address Bits [7:0]
Default = 00h
I/O Window 0 Limit Address Bits:
-
The 32-bit I/O Window 0 Limit Address Register selects the end address of I/O Window 0. 
-
The minimum window size is always 4 bytes.
RO:
Always returns 0.
PCICFG 31h
I/O Window 0 Limit Address Register - Byte 1: Address Bits [15:8]
Default = 00h
PCICFG 32h
I/O Window 0 Limit Address Register - Byte 2: Address Bits [23:16]
Default = 00h
PCICFG 33h
I/O Window 0 Limit Address Register - Byte 3: Address Bits [31:24]
Default = 00h
PCICFG 34h
I/O Window 1 Base Address Register - Byte 0: Address Bits [7:0]
Default = 00h
I/O Window 1 Base Address Bits:
-
The 32-bit I/O Window 1 Base Address Register selects the start address of one of two possible 
CardBus I/O windows to the slot interface. 
-
The I/O windows are globally enabled by bit 04h[0] (Command Register).
RO:
Always returns 
0.
Decoding:
0 = 16-bit
(AD[31:16] = 0)
1 = 32-bit
PCICFG 35h
I/O Window 1 Base Address Register - Byte 1: Address Bits [15:8]
Default = F0h
PCICFG 36h
I/O Window 1 Base Address Register - Byte 2: Address Bits [23:16]
Default = FFh
PCICFG 37h
I/O Window 1 Base Address Register - Byte 3: Address Bits [31:24]
Default = FFh
PCICFG 38h
I/O Window 1 Limit Address Register - Byte 0: Address Bits [7:0]
Default = 00h
I/O Window 1 Limit Address Bits:
-
The 32-bit I/O Window 1 Limit Address Register selects the end address of I/O Window 1. 
-
The minimum window size is always 4 bytes.
RO:
Always returns 0.
PCICFG 39h
I/O Window 1 Limit Address Register - Byte 1: Address Bits [15:8]
Default = 00h
PCICFG 3Ah
I/O Window 1 Limit Address Register - Byte 2: Address Bits [23:16]
Default = 00h
PCICFG 3Bh
I/O Window 1 Limit Address Register - Byte 3: Address Bits [31:24]
Default = 00h
PCICFG 3Ch
-
This register is readable and writable per the PCI specification. 
-
The logic does not use the value written to this register.
 Interrupt Line Register for Status Change
Default = 00h
PCICFG 3Dh
RO:
-
This register reflects the value written to PCICFG 4Ch. 
-
It defaults to 01h, selecting PCIRQ0# for the status change (docking station attach/detach) interrupt. 
-
If PCICFG 4Ch is written to select an ISA interrupt or no interrupt, this register returns 00h.
 Interrupt Pin Register for Status Change
Default = 01h
PCICFG 3Eh
Bridge Control Register - Byte 0
Default = 40h
Reserved
Force CRST# 
cycling 
on slot 
interface:
0 = CRST# high
1 = Assert 
CRST# 
(Default)
Response to 
master abort 
on slot 
interface:
0 = Ignore
1 = Signal with 
target abort 
or SERR#
Reserved:
Write as read.
Pass VGA 
addresses 
A0000-BFFFFh, 
3B0-3BBh, 
3C0-3DFh:
0 = No
1 = Yes
Reserved
Forwarding of 
SERR# from 
slot interface to 
primary PCI 
bus:
0 = Disable
1 = Enable
Response to 
parity errors on 
slot interface:
0 = Ignore
1 = Enable
Table 5-1
Base Register Group - PCICFG 00h-4Fh (cont.)
7
6
5
4
3
2
1
0