I/O Pin Assignment and Pin Functions

Pin #

Function

Description

1 (1,2,3)

GPIO0/P0.0/INT0

General-purpose I/O line 0 (P0.0);

interrupt line 0.

2 (1,2,3)

GPIO1/P0.1/INT1

General-purpose I/O line 1 (P0.1);

interrupt line 1;

for flash disk operation, connect to SI and SO of external flash.

3 (1,2)

GPIO2/P0.2

General-purpose I/O line 2 (P0.2).

4 (1,2)

GPIO3/P0.3

General-purpose I/O line 3 (P0.3);

for flash disk operation, connect to CLK of external flash, also  connect to 5.1K pull-up resistor to VCC (3.3V).

5 (1,2)

GPIO4/P0.4

General-purpose I/O line 4 (P0.4);

for flash disk operation, connect to CS of external flash.

6 (1,2)

GPIO5/P0.5

General-purpose I/O line 5 (P0.5);

for Wi-Fi operation, connect to DI and DO of GA1000.

7 (1,2)

GPIO6/P0.6

General-purpose I/O line 6 (P0.6);

for Wi-Fi operation, connect to CLK of GA1000, also to reset-generating logic (NAND gates).

8 (1,2)

GPIO7/P0.7

General-purpose I/O line 7 (P0.7);

for Wi-Fi operation, connect to CS of GA1000, also to reset-generating logic (NAND gates).

9 (1)

RX

RX, W1, and din input of the serial port.

10 (1)

TX

TX, W1, and dout output of the serial port.

11

GND

System ground.

12

MD

Mode selection pin.

13

RST

Reset input, active low. Proper external reset is a must.

14

SE

Link status LED control line.

15

SR

Dual-function red status LED control line.

16

SG

Dual-function green status LED control line.

17

RX-

Ethernet port, negative line of the differential input signal pair.

18

RX+

Ethernet port, positive line of the differential input signal pair.

19

TX-

Ethernet port, negative line of the differential output signal pair.

20

TX+

Ethernet port, positive line of the differential output signal pair.

21

AVCC

"Clean" power output for magnetics circuitry.

22

VCC

Positive power input, 3.3V nominal, +/- 5%, max. current consumption 260mA.