VT82C686B
PCI Function 2 Registers – USB Controller Ports 0-1
PCI Function 3 Registers – USB Controller Ports 2-3
Configuration Space USB Header Registers
Configuration Space USB Header Registers
Offset PCI Configuration Space Header
1-0 Vendor ID
3-2 Device ID
5-4 Command
7-6 Status
Default Acc
Offset PCI Configuration Space Header
1-0 Vendor ID
3-2 Device ID
5-4 Command
7-6 Status
Default Acc
RO
RO
RW
WC
RO
RO
RO
RO
RO
RW
RO
RO
—
RO
RO
RW
WC
RO
RO
RO
RO
RO
RW
RO
RO
—
1106
3038
0000
0200
nn
00
03
0C
00
16
1106
3038
0000
0200
nn
00
03
0C
00
16
8
9
Revision ID
8
9
Revision ID
Programming Interface
Sub Class Code
Base Class Code
Cache Line Size
Latency Timer
Header Type
Programming Interface
Sub Class Code
Base Class Code
Cache Line Size
Latency Timer
Header Type
A
B
C
D
E
F
A
B
C
D
E
F
00
00
00
00
00
00
BIST
BIST
10-1F -reserved-
10-1F -reserved-
23-20 USB I/O Register Base Address
24-3B -reserved-
3C Interrupt Line
3D Interrupt Pin
3E-3F -reserved-
23-20 USB I/O Register Base Address
24-3B -reserved-
3C Interrupt Line
3D Interrupt Pin
3E-3F -reserved-
00000301 RW
00000301 RW
00
00
04
00
—
RW
RO
—
00
00
04
00
—
RW
RO
—
Configuration Space USB-Specific Registers
Configuration Space USB-Specific Registers
Offset USB Control
Default Acc
Offset USB Control
Default Acc
40 USB Miscellaneous Control 1
41 USB Miscellaneous Control 2
42 USB FIFO Control
43 -reserved-
00
10
00
00
40 USB Miscellaneous Control 1
41 USB Miscellaneous Control 2
42 USB FIFO Control
43 -reserved-
00
10
00
00
RW
RW
RW
—
RW
RW
RW
—
44-45 -reserved- (test, do not program)
46-47 -reserved- (test)
48-5F -reserved-
60 USB Serial Bus Release Number
61-7F -reserved-
44-45 -reserved- (test only, do not program)
46-47 -reserved- (test)
48-5F -reserved-
60 USB Serial Bus Release Number
61-7F -reserved-
RW
RO
—
RO
—
RW
RO
—
RO
—
00
10
00
00
10
00
83-80 PM Capability
84 PM Capability Status
85-BF -reserved-
RO
RW
—
83-80 PM Capability
84 PM Capability Status
85-BF -reserved-
RO
RW
—
0002 0001
00
0002 0001
00
00
00
C1-C0 USB Legacy Support
C2-FF -reserved-
C1-C0 USB Legacy Support
C2-FF -reserved-
2000
00
RW
—
2000
00
RW
—
I/O Registers – USB Controller
I/O Registers - USB Controller
Offset USB I/O Registers
1-0 USB Command
3-2 USB Status
5-4 USB Interrupt Enable
7-6 Frame Number
Default Acc
Offset USB I/O Registers
1-0 USB Command
3-2 USB Status
5-4 USB Interrupt Enable
7-6 Frame Number
Default Acc
0000
0000
0000
0000
RW
WC
RW
RW
0000
0000
0000
0000
RW
WC
RW
RW
B-8 Frame List Base Address
00000000 RW
B-8 Frame List Base Address
00000000 RW
C
Start Of Frame Modify
RW
WC
WC
—
C
Start Of Frame Modify
RW
WC
WC
—
40
0080
0080
00
40
0080
0080
00
11-10 Port 0 Status / Control
13-12 Port 1 Status / Control
14-1F -reserved-
11-10 Port 2 Status / Control
13-12 Port 3 Status / Control
14-1F -reserved-
Revision 1.71 June 9, 2000
-32-
Register Overview