PC87200160A National Semiconductor, PC87200160A Datasheet - Page 21

• Manufacturer Part Number: PC87200160A
• Description: PC87200 PCI to ISA Bridge
• Manufacturer: National Semiconductor

7.0 Register Descriptions
Index 53h-5Ah
Index 5Bh
Note: Positive decoding by the PC87200 speeds up the I/O cycle time.
Index 5Ch-FFh
Bit
7
6
5
4
3
2
1
0
Internal use, do not overwrite.
Reserved — Set to 0.
BIOS ROM Positive Decode — Selects positive or subtractive decoding for accesses to the configured ROM
space:
0 = Subtractive; 1 = Positive.
Internal use, do not overwrite.
Internal use, do not overwrite.
Internal use, do not overwrite.
Internal use, do not overwrite.
Internal use, do not overwrite.
Table 4. Bridge Configuration Registers (Continued)
(Continued)
Decode Control Register 2 (R/W)
Internal use, do not overwrite
Internal use, do not overwrite
21
Description
Reset Value = 00h
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