User's Manual

Eagle II GSM Radio Module Technical Manual Preliminary Draft: 08/31/00 47
Part Number: 07100017 version 00.04
© 2000 Xircom, Inc. All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc.
Pin Signal
Name
Direction Functionality Voltage
Level
16 TX0 From CPE Transmit data 0. DCE Input signal. Active low. Main serial interface
receive data signal. During idle or reset, signal will be a logic 1.
Connects to a DTE, TX, transmit data pin.
5 V or
3 V
17 GPIO2 To/From CPE General purpose I/O bit. Used as general purpose input or output
lines for monitoring or control of external devices. Requires
customized stack software to implement. Leave signals disconnected
if function is not used.
3 V
18 CTS0 To CPE Clear-To-Send 0. DCE Output signal. Active low. Main serial
interface clear to send signal. Connects to a DTE, CTS, Clear to
send pin.
3 V
19 GPIO3 To/From CPE General purpose I/O bit. Used as general purpose input or output
lines for monitoring or control of external devices. Requires
customized stack software to implement. Leave signals disconnected
if function is not used.
3 V
20 RTS0 From CPE Request-To-Send 0. DCE Input signal. Active low. Main serial
interface request to send signal. Connects to a DTE, RTS, Request-
To-Send pin.
5 V or
3 V
21 GND From CPE Electrical power return for digital and analog grounds.
22 DTR0 From CPE Data Terminal Ready 0. DCE Input signal. Active low. Main serial
interface data terminal ready signal. Connects to a DTE, DTR, Data
Terminal Ready pin.
5 V or
3 V
23 RESET_B From CPE Reset Input. Active Low. Internally pulled high and can be left
disconnected if not used. If connected to external circuitry, maximum
high level must not exceed 3.3 V. Pulse width must be at least 5 mS
to guarantee a valid reset.
3 V
24
25
GND From CPE Electrical power return for digital and analog grounds.
26 TX1 To CPE Transmit Data 1. DTE Output signal. Secondary serial-interface
transmit data signal. Used as a debug interface for test purposes.
Leave signal disconnected if function is not used.
3 V
27 CLKOUT To CPE Clock output. A 50% duty cycle 13 MHz square wave clock source.
Used for synchronization of external circuitry to the base band
processor. Leave signal disconnected if function is not used.
3 V
28
29
GND From CPE Electrical power return for digital and analog grounds.
30 RX1 From CPE Receive Data 1. DTE Input signal. Secondary serial-interface receive
data signal. Used as a debug interface for test purposes. Leave
signal disconnected if function is not used.
5 V or
3 V
31 Reserved Do not use. Leave open.