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Enfora Enabler III-G
Modem Integration Guide
6.6.8.
General Purpose Input/Output Interface
GPIO number
GPIO 1
GPIO 2
GPIO 3
GPIO 4
GPIO 5
GPIO 6
GPIO 7
GPIO 8
Each general-purpose signal may be selected as inputs or outputs. GPIO1-GPIO8 may be used
independently as a user-specified function, or may be used to provide modem control and status signals.
Several examples of modem control signals are: power shutdown command, register/deregister on
network command, and transmitter disable. Several examples of modem status signals are: registration
status and ready-for-power-down status to be used with power shutdown command signal.
I/O Lines
V
IL
V
IH
V
OL
V
OH
I
/ I
OL
OH
Additional GPIO is available as alternate functions of the blocks listed. If the function is selected as a
GPIO block then all associated pins will become GPIO, the primary function will be disabled. Electrical
specifications for alternate GPIO functions will be the same as their primary pin function.
Primary Function
Primary Function Name
MSCI
MCSI_CLK
MCSI_FSYNC
MCSI_TX
MCSI_RX
SPI
SPI_CLK
SPI_MISO
SPI_MOSI
SPI_CS0
SPI_CS1
SPI_CS2
Some functions have a secondary output that can only be defined as either an input or an output.
Primary Function
Primary Function
Keyboard
KBR_0
KBR_1
KBR_2
KBR_3
KBR_4
KBC_0
KBC_1
KBC_2
KBC_3
KBC_4
*SPI, I2C, MCSI and Keyboard are for hardware reference only. There is no generic
firmware to support these functions. Firmware must be added to enable these functions
(TBD)
GSM0308PB001
Pin number
Secondary function
64
Pulse Width Tone
62
USB Boot
60
Light Output PWM
58
Transmit active / LED Pulse Generator
68
SPI Chip Select 0
70
SPI Strobe Enable
66
SPI RnW
72
SPI Data/Control Select
Parameter/Conditions
Input Voltage – Low
Input Voltage – High
Output Voltage – Low
Output Voltage – High
Rated Output Current
Name
Pin number
42
Min
0
1.11
1.26
Pin Number
14
16
18
12
30
26
22
24
28
20
Signal Direction
38
IN
40
IN
42
IN
36
IN
34
IN/OUT
27
OUT
33
OUT
29
OUT
31
OUT
32
IN/OUT
Version DRAFT – 2/9/2007
Typ
Max
Units
0.60
Vdc
1.8
Vdc
0.45
Vdc
Vdc
4
mA
GPIO Number
GPIO 9
GPIO 10
GPIO 11
GPIO 12
GPIO 13
GPIO 14
GPIO 15
GPIO 16
GPIO 17
GPIO 18
GPIO number
GPI 21
GPI 22
GPI 23
GPI 24
GPIO 19
GPO25
GPO26
GPO27
GPO28
GPIO 20
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