- Silex Technology Embedded Intelligent Module Developer's Reference Guide

Installing the Evaluation Daughtercard
Silex
Page 15
Part Number 140-00192-100
As discussed in the previous section, GPIOs 3 through 8 are set by default for special functions such as
modem controls. To use GPIOs 3 through 8 as normal GPIOs, you must place a jumper between JP7
and JP8 for the specific GPIO as described in the previous section. GPIO 2 can also have a special
function if SPI mode is selected for the LCD display via header JP12 as described in the LCD Interface
section later in this chapter.
Table 10 General Purpose I/O Signal Descriptions
Silex
S3C2412
I/O
Special Function
GPIO_0
GPF 0
O
GPIO_1
GPF 1
O
GPIO_2
GPF 2
O
Special function SPI_CS- for LCD display
GPIO_3
GPF 3
O
Special function TEMP_CS SPI temperature sensor enable
GPIO_4
GPF 4
O
Special function, nDTR0
GPIO_5
GPF 5
I
Special function, nDSR0
GPIO_6
GPF 6
I
Special function, nDCD0
GPIO_7
GPF 7
O
Special function, nLED_3; wired link
GPIO_8
GPG 5
O
Special function, nLED_2; wireless link
GPIO_9
GPG 6
O
nLED_1; power on/status*
GPIO_10
GPG 7
I
Switch Input; 1 = off, 0 = switch depressed*
*The functionality of GPIO_9 and GPIO_10 cannot be changed by the user.
LEDs and General Purpose I/O Signals
The LEDs are connected to the 10 GPIOs for easy viewing of signal activity. The first 7 GPIOs drive the
first 7 LEDs, D1 to D7 (these LEDs indicate the status of the GPIOs). GPIOs 7 to 9 drive LEDs D8 to
D10. Logic 0 and 0 volts on GPIO_x illuminates the LED.
Table 11 LED and GPIO Descriptions
GPIO
LED
GPIO_0
D1
GPIO_1
D2
GPIO_2
D3
GPIO_3
D4
GPIO_4
D5
GPIO_5
D6
GPIO_6
D7
GPIO_7
D10 green LED
GPIO_8
D9 yellow LED
GPIO_9
D8 orange LED
GPIO_10
N/A