S5335 datasheet(36/189 Pages) AMCC

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S5335 – PCI Bus Controller, 3.3V

Revision 5.01 – November 30, 2005

AMCC Confidential and Proprietary

DS1657

Data Sheet

Class Code Register (CLCD)

This 24-bit, read-only register is divided into three one-

byte fields: the base class resides at location 0Bh, the

sub-class at 0Ah, and the programming interface at

09h. The default setting for the base class is all ones

(FFh), which indicates that the device does not fit into

the thirteen base classes defined in the PCI Local Bus

Specification. It is possible, however, through use of

the external non-volatile memory, to implement one of

the defined class codes described in Table 22 below.

For devices that fall within the seven defined class

codes, sub-classes are also assigned. Tables 23

through 35 describe each of the sub-class codes for

base codes 00h through 0Ch, respectively.

Figure 12. Class Code Register

Class Code

Address Offset:

09h-0Bh

Power-up value:

FF0000h

Boot-load:

External nvRAM offset 049h-4Bh

Attribute:

Read Only

Size:

24 bits

Table 22. Defined Base Class Codes

Base-Class

Description

00h

Early, pre-2.0 PCI specification devices

01h

Mass storage controller

02h

Network controller

03h

Display controller

04h

Multimedia device

05h

Memory controller

06h

Bridge device

07h

Simple communication controller

08h

Base system peripherals

09h

Input devices

0Ah

Docking stations

0Bh

Processors

0Ch

Serial bus controllers

0D-FEh

Reserved

FFh

Device does not fit defined class codes (default)

Sub-Class

Base Class

Prog I/F

(Bit)

(Offset)

@09h

@0Ah

@0Bh

S5335 Datasheet(PDF) 36 Page - Applied Micro Circuits Corporation

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