Registers
http://www.motorola.com/computer/literature 2-101
2
Revision ID/ Class Code RegistersREVID Revision ID. This register identifies the PHB revision level. This register is duplicated in the PP C Registers.CLASS Class Code. This register identifies PHB as the following:Base Class Code $06 PCI Bridge DeviceSubclass Code $00 PCI Host BridgeProgram Class Code $00 Not UsedHeader Type RegisterThe Header Type Register (Header) identifies the PHB as the following:Header Type: $00 - Single Function Configuration HeaderOffset $08
Bit 3
13
02
92
82
72
62
52
42
32
22
12
01
91
81
71
61
51
41
31
21
11
09876543210
Name CLASS REVID
Operation RR
Reset $060000 $01
Offset $0C
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name HEADER
Operation RRRR
Reset $00 $00 $00 $00