Sundance-spas ST201 Manual do Utilizador descarregar pdf (Página 111)

111

Sundance Technology ST201 PRELIMINARY draft 2

EXPROMBASEADDRESS

Class....................PCI Configuration Registers, Configuration

Base Address ......PCI device configuration header start

Address Offset.....0x30

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

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

This read/write register allows the system to define the base address for the adapter’s Expansion ROM.

BIT BIT NAME BIT DESCRIPTION

0 AddressDecodeEn-

able

When this bit is cleared, the adapter’s Expansion ROM is disabled.

Setting this bit causes the adapter to respond to accesses in its config-

ured expansion ROM space, if MemorySpace in the ConfigCommand

14..1 Reserved Reserved for future use. Should be set to 0.

31..15 RomBaseAddress The system programs the expansion ROM base address into this field.

The access to bit [15] depends on Expansion ROM size setting in Asic-

Ctrl register. When ExpRomSize is 0 (32KB ExpRom), bit [15] is written

as part of the RomBaseAddress. When ExpRomSize is 1 (64KB

ExpRom), bit [15] ignores any write operation.

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Sundance-spas ST201 Manual do Utilizador Página 111