s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 101
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s5920
Manufacturer Part Number
s5920
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5920.pdf
(165 pages)
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S5920 – PCI Product: Initialization
A 16-bit pointer at location 18h of the PC expansion
ROM identifies the start offset of the PCI data struc-
ture. The PCI data structure is shown in Table 3 and
contains various vendor, product, and program
descriptions. This structure is provided here for refer-
ence only - the user should refer to the PCI BIOS
specification for complete details.
Table 51. PCI Data Structure
AMCC Confidential and Proprietary
Byte Offset
10h
12h
14h
15h
16h
Ah
Ch
Dh
0h
4h
6h
8h
Byte Length
(decimal)
4
2
2
2
2
1
3
2
2
2
1
2
Binary Value
ÔPCIRÕ
variable
variable
variable
variable
variable
variable
variable
variable
variable
variable
0000h
Signature, the ASCII string ÔPCIRÕ where ÔPÕ is at offset 0, ÔCÕ at off-
set 1, and so on
Vendor Identification
Device Identification
Pointer to Vital Product Data
PCI Data Structure Length (starts with signature field)
PCI Data Structure Revision (=0 for this definition)
Class Code
Image Length
Revision Level
Code Type
Indicator (bit D7=1 signifies “last image”)
Reserved
Note: The access time for large serial devices should
be considered, since it may cause a lengthy system
delay during initialization. For example, a 2 Kbytes
serial device will take about 1 second to be read. Many
systems, even when BIOS ROMs are ultimately shad-
owed into system RAM, may read this memory space
twice (once to validate its size and checksum, and
once to move it into RAM).
Description
Revision 1.02 – April 12, 2007
Data Book
DS1596
101
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