VT8235 datasheet(65/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-59-

Device 16 Function 3 USB 2.0 EHCI Registers

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USB-Specific Configuration Registers

Offset 40 - Miscellaneous Control 1 (40h) .......................RW

Reserved

........................................ always reads 0

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

Automatically disable babbled port when EOF

babble occurs

Don’t disable babbled port ....................default

PCI Parity Check

Disable .................................................. default

Enable

Reserved (Do Not Program)

.................... default = 0

3-2

Reserved

........................................ always reads 0

DMA Options

16 DW burst access ............................... default

8 DW burst access

Reserved

........................................ always reads 0

Offset 48 - Miscellaneous Control 1 (A0h) ......................RW

7-6

Reserved (Do Not Program)

.................... default = 0

CCA Burst Access

Burst enable

Burst disable..........................................default

4-1

Reserved

........................................ always reads 0

Reserved (Do Not Program)

.................... default = 0

Offset 49 - Miscellaneous Control 2 (20h) .......................RW

7-6

Reserved (Do Not Program)

.................... default = 0

Clock Auto Stop

Disable, no stop

Enable, auto stop ...................................default

Auto Power Down Receiver Squelch Detector

Auto Power Down................................. default

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

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