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.