s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 66

• Manufacturer Part Number: s5920
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5920 – PCI Product: PCI Configuration Registers
Table 38. Read Response to Expansion ROM Base Address Register (after all ones written)
1. The Expansion ROM Base Address Register nvRAM boot value is internally hardwired to FFFFF80Xh, where X = 000xb (i.e., only the least-
AMCC Confidential and Proprietary
significant bit, or Address Decode Enable bit, is programmable). This defines both the minimum and maximum expansion ROM size sup-
ported by the S5920 (2K bytes). The Address Decode Enable bit in the nvRAM (the LSB) must be set to enable this region. If not set, a PCI
Configuration read of this region will always respond with 00000000h.
FFFFF801h
00000000h
Response
2K bytes (512 DWORDs)
none - disabled
Size in Bytes
00000000h or BIOS missing 1
FFFFF801h
nvRAM boot value
Revision 1.02 – April 12, 2007
Data Book
DS1596
66