Sundance-spas ST201 Manual de usuario descargar pdf (Pagina 84)

Sundance Technology ST201 PRELIMINARY draft 2

EXPROMADDR

Class....................I/O Registers, External Interface Control

Base Address ......IoBaseAddress register value

Address Offset.....0x40

Access Mode.......Read/Write

Width ...................32 bits

ExpRomAddr holds the address to be used for direct I/O accesses of the Expansion ROM through the

ExpRomData port. To access a byte in the Expansion ROM, write the address of the byte to be accessed

into ExpRomAddr. Then issue either a read or a write to ExpRomData. For reads, the ROM value will be

returned by the read instruction. For writes, the new value will be programmed into the ROM upon comple-

tion of the write instruction.

BIT BIT NAME BIT DESCRIPTION

15..0 ExpRomAddr Address used for accessing expansion ROM.

31..16 Reserved Reserved for future use. Should be set to 0.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 144 145

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Sundance-spas ST201 Manual de usuario Pagina 84