S5935_07 Datasheet, PDF (41/204 Pages) Applied Micro Circuits Corporation – PCI Product

S5935 – PCI Product
CLASS CODE REGISTER (CLCD)
Register Name ^{Class Code}
Address Offset ^09h-0Bh
Power-up value ^FF0000h
Boot-load
External nvRAM offset 049h-4Bh
Attribute
Read Only
Size
24 bits
Revision 1.02 – June 27, 2006
Data Book
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 7 below.
For devices that fall within the seven defined class
codes, sub-classes are also assigned. Tables 8
through 20 describe each of the sub-class codes for
base codes 00h through 0Ch, respectively.
Figure 13.
7
@0Bh
Base Class
07
@0Ah
Sub-Class
07
@09h
Prog I/F
Table 10. Defined Base Class Codes
Base-Class
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0D-FEh
FFh
Description
Early, pre-2.0 PCI specification devices
Mass storage controller
Network controller
Display controller
Multimedia device
Memory controller
Bridge device
Simple communication controller
Base system peripherals
Input devices
Docking stations
Processors
Serial bus controllers
Reserved
Device does not fit defined class codes (default)
(Offset)
0 (Bit)
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