Revision 1.02 – April 12, 2007
S5920 – PCI Product: PCI Configuration Registers
Data Book
Table 37. Read Response (I/O Assigned) to an All-Ones Write Operation to a Base Address Register
Response
00000000h
Size in Bytes
nvRAM boot value
00000000h or BIOS missing
none - disabled
FFFFFFFDh
FFFFFFF9h
FFFFFFF1h
FFFFFFE1h
FFFFFFC1h
FFFFFF81h
FFFFFF01h
4 bytes (1 DWORDs)
8 bytes (2 DWORDs)
16 bytes (4 DWORDs)
32 bytes (8 DWORDs)
64 bytes (16 DWORDs)
128 bytes (32 DWORDs)
256 bytes (64 DWORDs)
FFFFFFFDh
FFFFFFF9h
FFFFFFF1h
FFFFFFE1h
FFFFFFC1h
FFFFFF81h 1
FFFFFF01h
1. Base Address Register 0, at offset 10h, powers up as FFFFFF81h. This default assignment allows usage without an external boot memory.
Should an nvRAM be used, the base address can be boot loaded to become a memory space (FFFFFF80h or FFFFFF82h).
AMCC Confidential and Proprietary
DS1596
62
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
