CS5920 datasheet(96/160 Pages) AMCC

96 / 160 page

S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

Data Book

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.

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 51. PCI Data Structure

Byte Offset

Byte Length

(decimal)

Binary Value

Description

ÔPCIRÕ

Signature, the ASCII string ÔPCIRÕ where ÔPÕ is at offset 0, ÔCÕ at off-

set 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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