F85226 Datasheet, PDF (31/44 Pages) Feature Integration Technology Inc. – LPC to ISA Bridge

Fintek
Feature Integration Technology Inc.
F85226
For example: Decoding address was set to be 0x3F5h when wrote F5h to CR24
and 03h to CR25 .
8.28 ROM1 Decoder Mask Low Byte Register – Index 0x28
Power-on default [7:0] =0000_0000b
Bit
Name
R/W PWR
Description
7-0 ROM_MASK1
The register CR28, 29 are used to mask address bits (A19~A4) for specify address
decoder, if the corresponding bit of this register is set to a 1, the corresponding
R/W VDD3V _{address bit(A19~A4) is ignored by the specify address decoder.}
For example: If the decoding range is 0xF_FFFX ~ 0xF_E00X, you can set
0xF_FFFF to CR2A, 2B and ffh to CR28, 01h to CR29.
8.29 ROM Decoder Mask (High Byte) Register – Index 0x29
Power-on default [7:0] =0000_0000b
Bit
Name
R/W PWR
Description
7-0 ROM_ MASK1
The register CR28, 29 are used to mask address bits (A19~A4) for specify address
decoder, if the corresponding bit of this register is set to a 1, the corresponding
R/W VDD3V _{address bit(A19~A4) is ignored by the specify address decoder.}
For example: If the decoding range is 0xF_FFFX ~ 0xF_E00X, you can set
0xF_FFFF to CR2A, 2B and ffh to CR28, 01h to CR29.
8.30 ROM Decoder Address (Low Byte) Register – Index 0x2A
Power-on default [7:0] =0000_0000b
Bit
Name
R/W PWR
Description
This register contains the address for specify decoder.
CR2A Bit [7..0] are used to define low address[11:4].
7-0 ROM_DEC1
R/W VDD3V _{CR2B Bit [7..0] are used to define high address[19:12].}
For example: Decoding address was set to be 0xF_FEEXh when wrote EEh to
CR2A and FFh to CR2B.
8.31 ROM Decoder Address (High Byte) Register – Index 0x2B
Power-on default [7:0] =0000_0000b
Bit
Name
R/W PWR
Description
7-0 ROM_DEC1
This register contains the address for specify decoder.
CR2A Bit [7..0] are used to define low address[11:4].
R/W VDD3V _{CR2B Bit [7..0] are used to define high address[19:12].}
For example: Decoding address was set to be 0xF_FEEXh when wrote EEh to
CR2A and FFh to CR2B.
F85226
26
July, 2007
V0.25P