s5935qrc Applied Micro Circuits Corporation (AMCC), s5935qrc Datasheet - Page 98
s5935qrc
Manufacturer Part Number
s5935qrc
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5935QRC.pdf
(204 pages)
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S5935 – PCI Product
Table 39. PC Compatible Expansion ROM
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 evolu-
tions. If a valid external nv memory is identified by the
S5935, the PCI data structure is used to configure the
S5935. The PCI data structure is not necessary for this
device to operate. If no external nv memory is imple-
mented, the S5935 boots with the default configuration
values.
Table 40. PCI Data Structure
98
Byte Offset
68h
70h
74h
7Ch
7Dh
7Eh
7Fh
80h —
(1FFh), or
(2FFh), or
(3FFh), etc.
Byte Offset
0h
4h
6h
8h
Ah
Ch
Dh
10h
12h
14h
15h
16h
DS1527
Byte Length
application specific
Byte checksum, location dependent on value for length field at offset 0002h.
Length
4
2
2
2
2
1
3
2
2
1
1
2
Byte
8
4
8
1
1
1
1
Binary
‘PCIR’
var.
var.
var.
var.
var.
var.
var.
var.
var.
var.
0000h
Value
not used
[Expansion ROM base addr.]
not used
[Interrupt line]
[Interrupt pin]
[Min-Grant]
[Max_lat]
Signature, the ASCII string ‘PCIR’ where ‘P’ is at offset 0, ‘C’ at offset 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
Binary Value
(example shows 32K bytes)
Note: If a serial BIOS ROM is used, the access time
for large serial devices should be considered, since it
may cause a lengthy system delay during initialization.
For example, a 2-Kbyte serial device takes about 1
second to be read. Many systems, even when BIOS
ROMs are ultimately shadowed into system RAM, may
read this memory space twice (once to validate its size
and checksum, and once to move it into RAM). Execu-
tion directly from a serial BIOS ROM, although
possible, may be unacceptably slow.
Description
Description
Revision 1.02 – June 27, 2006
AMCC Confidential and Proprietary
Data Book
FFFF8001h
0Ch
01h
00h
00h
Example
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