w83629d Winbond Electronics Corp America, w83629d Datasheet - Page 21

• Manufacturer Part Number: w83629d
• Description: Pci To Isa Bridge Set
• Manufacturer: Winbond Electronics Corp America

8.24 WISA_FADCB5-ISA BRIDGE FAST DECODERS # 5 BASE ADDRESS REGISTER
Address Offset:
Default Value:
Attribute:
This register contains the base address for fast address decoder # 5.
8.25 WISA_FADCB6-ISA BRIDGE FAST DECODERS # 6 BASE ADDRESS REGISTER
Address Offset:
Default Value:
Attribute:
This register contains the base address for fast address decoder # 6.
8.26 WISA_FADCB7-ISA BRIDGE FAST DECODERS # 6 BASE ADDRESS REGISTER
Address Offset:
Default Value:
Attribute:
This register contains the base address for fast address decoder # 0.
8.27 WISA_CTRLREG1-ISA BRIDGE CONTROL REGISTER 1
Address Offset:
Default Value:
Attribute:
Power-on setting bits
Bit 7-6
Bit 5-4
Bit 3-2
Bit 1
Bit 0
= 00 Send AD Bus with no STEP
= 00 1MB BIOS ROM positive decode.
= 10 4MB BIOS ROM positive decode.
= 11 8MB BIOS ROM positive decode.
=0 Disable High-Address BIOS ROM decoder.
=1 Enable High-Address BIOS ROM decoder.
This bit can be set/reset by ROMCS# power-on setting during PCIRST# assert.
=0 Normal mode.
=1 Disable ISA Bridge subtraction decoder.
This bit can be set/reset by HS1 power-on setting during PCIRST# assert.
Reserved.
= 01 Send AD Bus with 2 STEP
= 10 Send AD Bus with 4 STEP
= 11 Reverse
= 01 2MB BIOS ROM positive decode.
6A-6Bh
0000h
Read/Write
6C-6Dh
0000h
Read/Write
6E-6Fh
0000h
Read/Write
70h
000001ssb
Read/Write
bit 1:0 are power-on set by ROMCS# and HS1.
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W83628F & W83629D
Publication Release Date: May 18, 2005
Revision A1