VT8231 datasheet(20/132 Pages) ETC

20 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-14-

Pinouts

7HFKQRORJLHV ,QF

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Universal Serial Bus Interface

Signal Name

Pin #

I/O

Signal Description

USBP0+

B20

USB Port 0 Data +

USBP0-

A20

USB Port 0 Data -

USBP1+

B19

USB Port 1 Data +

USBP1-

A19

USB Port 1 Data -

USBP2+

B18

USB Port 2 Data +

USBP2-

A18

USB Port 2 Data -

USBP3+

C17

USB Port 3 Data +

USBP3-

B17

USB Port 3 Data -

USBCLK

C15

USB Clock. 48MHz clock input for the USB interface

USBOC0#

A17

USB Port 0 Over Current Detect. Port 0 is disabled if this input is low.

USBOC1#

D16

USB Port 1 Over Current Detect. Port 1 is disabled if this input is low

USBOC2# / LA20 / GPO20

W13

I / IO / O

USB Port 2 Over Current Detect. Port 2 is disabled if this input is low.

USBOC3# / LA21 / GPO21

Y13

I / IO / O

USB Port 3 Over Current Detect. Port 3 is disabled if this input is low.

System Management Bus (SMB) Interface (I

2C Bus)

Signal Name

Pin #

I/O

Signal Description

SMBCK1

SMB / I

2C Channel 1 Clock.

SMBCK2 / GPIO27

IO / IO

SMB / I

2C Channel 2 Clock.

SMBDT1

SMB / I

2C Channel 1 Data.

SMBDT2 / GPIO26

IO / IO

SMB / I

2C Channel 2 Data.

SMBALRT# / GPI7

I / I

SMB Alert. (System Management Bus I/O space Rx08[3] = 1) When the

chip is enabled to allow it, assertion generates an IRQ or SMI interrupt or a

power management resume event. The same pin is used as General Purpose

Input 6 whose value is reflected in Rx48[6] of function 4 I/O space

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