GL640USB datasheet(6/39 Pages) ETC

6 / 39 page

Revision 1.1

Jun. 7, 1999

-5-

GL640USB, GL640USB-A

5.. Pin Descriptions

GL640USB

Pin No.

GL640USB-A

Pin No.

SYMBOL I/O

DESCRIPTION

CLKOUT

O Clock output to external device

The clock frequency is selected by setting DEVCTL register.

HRST

High active hardware reset, internal pull low

With internal power-on reset circuit, this pin can be left unconnected or

pulled low.

WR#

O This active low signal indicates the EPP write operation.

WAIT#

this signal acts as the acknowledge from external EPP device, internal

pull up

5-8

1-4

D0-D3

I/O Address/Data bus bit 0 to bit 3

DVCC

Digital 5V input

DGND

Digital ground

11-14

7-10

D4-D7

I/O Address/Data bus bit 4 to bit 7

VCP

3.3 V output. This output voltage is used to pull up D+ line to indicate

the full-speed device.

D+

I/O USB differential data

D-

I/O USB differential data

AVCC

Analog 5V input

AGND

Analog ground

GPI1

General purpose input 1

GPI2

General purpose input 2

GPI3

General purpose input 3

I/O Crystal output

12/48 MHz crystal or external clock input

OSCSEL

Oscillator Select, internal pull down

0=12MHz

1=48MHz

GPI4

General purpose input 4, internal pull up

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