W83628AG Nuvoton Technology Corporation of America, W83628AG Datasheet - Page 38

• Manufacturer Part Number: W83628AG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83628AG

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / RoHS Status: Compliant

Address Offset:
Default Value:
Attribute:
Power-on setting bits
Default voltage level will be internal pull-down resistance 47K ohm to logical 0 level during
PCIRST# reset cycle.
Bit 7-6
Bit 5-4
Bit 3-2
Bit 1
Bit 0
10.30
WISA_CTRLREG1-ISA BRIDGE CONTROL REGISTER 1
= 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#
assertion.
=0 Normal mode.
=1 Disable ISA Bridge subtraction decoder.
Reserved.
= 01 Send AD Bus with 2 STEP
= 10 Send AD Bus with 4 STEP
= 11 Reverse
= 01 2MB BIOS ROM positive decode.
This bit can be set/reset by HS1 power-on setting during PCIRST# assertion.
70h
000010ssb
Read/Write
bit 1:0 are power-on set by ROMCS# and HS1.
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W83628AG & W83629AG
Publication Release Date: January, 2008
Revision 1.2