Sundance Spas ST201 - Manual (Page 111)

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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
register is also set.
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.