CS5320 datasheet(89/160 Pages) AMCC

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S5320 – PCI Match Maker: Initialization

Revision 5.03 – June 14, 2006

AMCC Confidential and Proprietary

DS1656

Data Sheet

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 40 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.

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).

Table 40. PCI Data Structure

Byte Offset

Byte Length

(decimal)

Binary Value

Description

“PCIR”

Signature, the ASCII string “PCIR” where “P” is at offset 0, “C” at offset 1,

and so on

variable

Vendor Identification

variable

Device Identification

variable

Pointer to Vital Product Data

variable

PCI Data Structure Length (starts with signature field)

variable

PCI Data Structure Revision (=0 for this definition)

variable

Class Code

10h

variable

Image Length

12h

variable

Revision Level

14h

variable

Code Type

15h

variable

Indicator (bit D7=1 signifies “last image”)

16h

0000h

Reserved

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