W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 26

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
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ROM Base Address Register ( )
Index : 0x00,0x02,0x04, 0x06
Index : 0x01,0x03,0x05,0x07
These eight 8-bit registers (boundle to four 16-bit registers) defines the most significant 16 bits
of each ROM banks' base (bottom) address. The "ROM base address" togather with the "ROM
size" (defined in ROMconf0) construct the whole address range of each ROM banks.
These ROM base registers do not contain any initial value after system power-on. All ROM access
will be directed to bank 0 right after system power-on (for ROMconf3[3]=1 at that time). System
programmer shall not set ROMconf3[3] to logic 0 before all ROM base and configuration registers
have been filled with valid data.
ROM Configuration_0 Register (ROMconf0)
Index : 0x08
Bit 0
Bits 1-3 Size of ROM bank 0
ROMen0
0
0
0
Enable ROM bank 0
0 = Disable
1 = Enable
1
1
1
ROM bank_0 size
ROM base address bit 0-7 (most significant bits)
Read/Write
2
2
2
ROM base address bit 8-15
3
3
3
Read/Write
Read/Write
ROMen1
4
4
4
Power-on Default : 0x0
5
5
5
ROM bank_1 size
Power-on Default : --
Power-on Default : --
6
6
6
7
7
7
W90220F
Version 0.84