Revision 1.2

June 1, 2001

-4-

GL641USB

GL641USB

GL641USB

GL641USB

3. PIN Definitions and Descriptions

Pin No.

Name

I/O

Description

1

PVDD

PWR

Power supplier for storage device interface

2

D8

I/O

Storage device data bus bit 8*

3

D9

I/O

Storage device data bus bit 9*

4

D10

I/O

Storage device data bus bit 10*

5

D11

I/O

Storage device data bus bit 11*

6

PGND

PWR

Ground for storage device interface

7

D12

I/O

Storage device data bus bit 12*

8

D13

I/O

Storage device data bus bit 13*

9

D14

I/O

Storage device data bus bit 14*

10

D15

I/O

Storage device data bus bit 15*

11

DIOR#

O

Storage device read strobe signal*

12

DIOW#

O

Storage device write strobe signal*

13

INTRQ

I

Storage device interrupt request signal*

14

DVDD

PWR

5V power supplier for internal logic

15

DGND

PWR

Ground for internal logic

16

Crystal out

CLK

Crystal clock output

17

Crystal in

CLK

Crystal clock input

18

GPIO1

I/O

General purpose I/O 1

19

GPIO2

I/O

General purpose I/O 2

20

V3.3

USB

3.3v power supplier for USB bus

21

D+

USB

D+ signal for USB

22

D-

USB

D- signal for USB

23

AVDD

PWR

5V power supplier for USB interface

24

AGND

PWR

Ground for USB interface

25

GPIO3

I/O

General purpose I/O 3

26

GPIO4

I/O

General purpose I/O 4

27

TSTMODE

I

Used at test mode only

28

EXTRST#

I

Used at test mode only

29

GPIO8

I/O

General purpose I/O 8

30

GPIO7

I/O

General purpose I/O 7

31

GPIO6

I/O

General purpose I/O 6

32

GPIO5

I/O

General purpose I/O 5

33

DGND

PWR

Ground for internal logic

34

DVDD

PWR

5V power supplier for internal logic

35

CS3FX#

O

Storage device register bank 3 selector*

36

CS1FX#

O

Storage device register bank 1 selector*

37

A0

O

Storage device address bus bit 0*

38

A1

O

Storage device address bus bit 1*

39

A2

O

Storage device address bus bit 2*

40

D0

I/O

Storage device data bus bit 0*

41

D1

I/O

Storage device data bus bit 1*

42

D2

I/O

Storage device data bus bit 2*

43

D3

I/O

Storage device data bus bit 3*

44

PGND

PWR

Ground for storage device interface

45

D4

I/O

Storage device data bus bit 4*

46

D5

I/O

Storage device data bus bit 5*

47

D6

I/O

Storage device data bus bit 6*

48

D7

I/O

Storage device data bus bit 7*

Table 3-1 GL641USB Pin Definitions and Descriptions

* Output voltage of this pin is equivalent to voltage supplied by PVDD.

Input voltage of this pin can be from 0v to 5v, and it threshold is 1v ~ 2v.

Therefore, these pins can support 3v/5v interface according to voltage of PVDD.