Product specifications

VT8235 V-Link South Bridge
Revision 1.22 October 24, 2002 -59- Device 16 Function 3 USB 2.0 EHCI Registers
USB-Specific Configuration Registers
Offset 40 - Miscellaneous Control 1 (40h).......................RW
7 Reserved ........................................ always reads 0
6 Babble Option
This bit controls whether the port is disabled when
EOF (End-Of-Frame) babble occurs. Babble is
unexpected bus activity that persists into the EOF
interval. When this bit is 0, the port with the EOF
babble is disabled. When it is 1, it is not disabled
0 Automatically disable babbled port when EOF
babble occurs
1 Don’t disable babbled port....................default
5 PCI Parity Check
0 Disable .................................................. default
1 Enable
4 Reserved (Do Not Program).................... default = 0
3-2 Reserved ........................................ always reads 0
1 DMA Options
0 16 DW burst access............................... default
1 8 DW burst access
0 Reserved ........................................ always reads 0
Offset 48 - Miscellaneous Control 1 (A0h) ......................RW
7-6 Reserved (Do Not Program).................... default = 0
5 CCA Burst Access
0 Burst enable
1 Burst disable..........................................default
4-1 Reserved ........................................ always reads 0
0 Reserved (Do Not Program).................... default = 0
Offset 49 - Miscellaneous Control 2 (20h).......................RW
7-6 Reserved (Do Not Program).................... default = 0
5 Clock Auto Stop
0 Disable, no stop
1 Enable, auto stop ...................................default
4 Auto Power Down Receiver Squelch Detector
0 Auto Power Down................................. default
1 Always Powered Up
3-0 Reserved ........................................ always reads 0
Offset 60 - Serial Bus Release Number (20h) ..................RO
7-0 Release Number..........always reads 20h for USB 2.0
Offset 61 - Frame Length Adjust (20h)............................RO
Offset 63-62 – Port Wake Capability (0001h) .................RO
Offset 6B-68 - Legacy Support Extended Capability .....RO
31-0 Capabilities .......................always reads 0000 0001h
Offset 6F-6C - Legacy Support Control / Status............RW
31-0 Control / Status..................always reads 0000 0000h
Offset 84 – PM Capability Status.................................... RW
7-0 PM Capability Status
00 D0 .................................................... default
01 -reserved-
10 -reserved-
11 D3 Hot