Wavecom GR64 User manual

Mi
g
ration Guide
Differences Between GR64 and
GR4x Wireless CPU®Devices
Reference:
W
I_DEV_GR64_DVD_001
Version: 002
Date: April 18, 2007

Migration Guide
GR4x to GR64
Page ii of v
GR4x to GR64 Migration Guide
Trademarks
®, WAVECOM
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
®, WISMO , Open AT ® ®, Wireless CPU®, Wireless Microprocessor®and
certain other trademarks and logos appearing on this document, are filed or
registered trademarks of Wavecom S.A. in France or in other countries. All other
company and/or product names mentioned may be filed or registered trademarks of
their respective owners.
Copyright
This manual is copyrighted by WAVECOM with all rights reserved. No part of this
manual may be reproduced in any form without the prior written permission of
WAVECOM.
No patent liability is assumed with respect to the use of the information contained
herein.
No Warranty
This document is provided “as is” without any warranty of any kind. WAVECOM
makes no warranties of any kind, either express or implied, including any implied
warranties of merchantability, fitness for a particular purpose or noninfringement.

Migration Guide
GR4x to GR64
Page iii of v
GR4x to GR64 Migration Guide
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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Revision History
Edition Date Change Information
001 04/04/2007 First Edition
002 04/18/2007 Added warning to Section 4.

Migration Guide
GR4x to GR64
Page iv of v
GR4x to GR64 Migration Guide
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Table of Contents
1Target Users ................................................................................. 1
1.1 MIGRATION AIM ........................................................................................... 1
1.2 MIGRATION STRATEGY ................................................................................. 1
1.3 MIGRATION VALUE ....................................................................................... 1
2Product Differences ...................................................................... 2
2.1 GR64 VARIANTS ........................................................................................... 2
2.1.1 INTEGRATED SIM VARIANT .................................................................... 2
2.1.2 LEGACY VARIANT.................................................................................. 2
2.2 NOTEWORTHY DIFFERENCES ......................................................................... 3
2.2.1 GSM FREQUENCY COVERAGE ................................................................. 3
2.2.2 GPRS OPERATING CLASS........................................................................ 3
2.2.3 UARTS .................................................................................................. 5
2.2.4 DIGITAL IO............................................................................................ 5
2.2.5 PCM AUDIO........................................................................................... 6
2.2.6 SIM INTERFACE ..................................................................................... 9
2.2.7 DAC INTERFACE .................................................................................... 9
2.2.8 ADC INTERFACE .................................................................................... 9
2.2.9 SPI ........................................................................................................ 9
2.2.10 SLEEP MODE.......................................................................................... 9
2.2.11 MECHANICAL FORM FACTOR............................................................... 10
2.3 GENERAL OBSERVATIONS............................................................................ 10
3Product Comparison ................................................................... 11
3.1 GR64 SIGNAL INTERFACE ............................................................................ 11
3.2 SPECIFIC SIGNAL DIFFERENCES .................................................................... 14
3.2.1 SIGNAL FUNCTIONALITY...................................................................... 14
3.2.2 CHARGING INPUT................................................................................ 17
3.2.3 SIM VOLTAGE...................................................................................... 17
3.2.4 D TO A CONVERTER ............................................................................ 17
3.2.5 REAL TIME CLOCK VOLTAGE................................................................ 18
3.2.6 A TO D CONVERTER ............................................................................ 18
3.2.7 REGULATED VOLTAGE REFERENCE ....................................................... 18

GR4x to GR64 Migration Guide
Migration Guide This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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3.2.8 FORMER UART2................................................................................... 19
3.2.9 ................................ 19FORMER PCM AUDIO DIGITAL CODEC INTERFACE
3.2.10 ................................................................................................ 20ALARM
3.2.11 .................................................................................. 20SERVICE SIGNAL
3.3 ................................................................... 21GENERAL SIGNAL DIFFERENCES
3.3.1 ............................................................................. 21AUDIO INTERFACES
3.3.2 ....................................................... 22MULTIPLEXED SIGNAL FUNCTIONS
3.4 ......................................................................... 22SOFTWARE COMPATIBILITY
3.4.1 ............................................................................. 23SIGNAL BEHAVIOUR
3.4.2 ................................................................................... 23AT COMMANDS
4Mechanical Comparisons ............................................................ 26
GR4x to GR64
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GR4x to GR64 Migration Guide
1Target Users
The GR64 wireless modems are designed to be integrated into machine-to-machine
or man-to-machine communications applications.
They are intended to be used by manufacturers, system integrators, applications
developers and developers of wireless communications equipment.
The GR64 is design to be functionally comparable to an earlier series of M2M
telemetry products; the GM4x series and the GR4x series. These users are the
primary focus of the GR64.
1.1 Migration Aim
This document identifies a suitable migration to the GR64 for existing users of the
following Wavecom M2M devices:
•GM47 •GR47
•GM48 •GR48
1.2 Migration Strategy
The Wavecom Gx64 series devices provide a family of products based on a Quad Band
GPRS Core concept. The GR64 shares a large degree of commonality with the GS64,
with the exception that its mechanical form-factor, physical interface, and signal
characteristics are designed to be closely aligned to the existing products listed
above, thereby providing a convenient path for upgrade.
Some differences do exist between the existing GM/GR4x products and the new
GR64. This Migration Guide highlights the differences and identifies ways to
minimize any effects on existing users.
1.3 Migration Value
The GR64 was developed for a number of key reasons, all of them designed to benefit
existing users of the predecessor family:
•Newer technology
•ROHS compliance
•Better performance
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GR4x to GR64
Page 1 of 28

GR4x to GR64 Migration Guide
2Product Differences
This section identifies the major differences between GR64 and the predecessor
GR47/48 products. For all practical purposes the comparisons also reflect the
similarities and differences to the GM47/48 since these products are merely a subset
function of the GR products.
2.1 GR64 Variants
The GR64 is available in a number of variants. The major variance is described below,
and a table is included as a quick-guide reference.
2.1.1 Integrated SIM Variant
The integrated SIM variant GR64 has, as the name suggests, a physical SIM holder
mounted on the top side of the assembly. Like its predecessor it supports a SIM card
connected through the system connector (off-board). This version of the GR64 also
has a Real Time Clock (RTC) alarm output. Digital PCM connectivity is different to that
of legacy products. Level shifting circuitry is incorporated in the Wireless CPU®,
allowing the host to provide its own I/O reference.
Additionally, the integrated SIM variant is available with or without Embedded
Applications capability.
2.1.2 Legacy Variant
The legacy variant GR64 relies on an off-board SIM connection, accessible through
the system connector. The legacy variant does not support the RTC alarm, but does
allow legacy applications to retain digital PCM audio routing without making changes
to their application PCB. Level shifting circuitry is incorporated in the Wireless CPU®
providing instant compatibility with 2.8V/3.0V legacy technology, or allowing the host
to use a Wireless CPU®-originated I/O reference to level shift its application I/O.
Additionally, the integrated SIM variant is available with or without Embedded
Applications capability.
Migration Guide This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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GR4x to GR64
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GR4x to GR64 Migration Guide
GR64 Variants Quick Guide
GR64 Product GR64001 GR64002
Integrated SIM holder NO YES
RTC Alarm interface NO YES
Direct 2.8V/3.0V I/O compatible YES NO
On board level shifting support YES YES
Embedded Application support YES YES
2.2 Noteworthy Differences
Some essential differences exist between the respective products, which are
summarized here and described in further detail in subsequent sections of this
document.
2.2.1 GSM Frequency Coverage
The GR64 is a Quad Band product, unlike its predecessors which were dual band. The
GR64 provides seamless GSM coverage in all regions of the world, in the following
GSM bands:
•GSM 850
•E-GSM 900
•GSM 1800
•GSM 1900
2.2.2 GPRS Operating Class
The GR64 is a GPRS Class 10 capable device, compared with its predecessors which
were Class 8. GPRS Class marking defines the number of uplink and downlink slots
that are permissible, as the following tables show:
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GR4x to GR64
Page 3 of 28

GR4x to GR64 Migration Guide
GPRS Multislot Class Support
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Product Capability
Multislot Downlink Uplink Active
Class Slots Slots Slots GR47 GR48 GR64
8 4 1 5 Yes Yes Yes
10 4 2 5 No No Yes
12 4 4 5 No No No
Multislot Class Performance – all configurations
Maximum Data Rate
Multislot Downlink Uplink
Class Slots Slots Receive Send
32-40Kbps
8 4 1 8-12Kbps
32-48Kbps 8-12Kbps
4 1
10 24-36Kbps 16-24Kbps
3 2
32-48Kbps 8-12Kbps
4 1
24-36Kbps 16-24Kbps
3 2
12 16-24Kbps 24-36Kbps
2 3
8-12Kbps 32-48Kbps
1 4
Actual data rates achieved are dependent upon the Coding Scheme (CS) in use; the
table above shows the range of rates that are achievable within the CS classes
supported by the GR64.
The major impact of GPRS Class differences between the GR64 and legacy products is
the demand upon power supplies to maintain peak currents during the increased
number of transmission bursts within a single GSM timeslot. The major impact is in
the lower GSM bands (GSM850/900) where maximum transmitter output power is 2W
(33dBm). In order to support more than two bursts within a GSM timeframe it may be
necessary for integrators to review their power supply designs in order to make full
use of the added uplink slot capability of GR64.
To overcome the problem that multiple uplink allocation may present to legacy
applications, the following measure has been taken: users have the capability to
modify the GPRS operating class reported to the network in the initial release of
products, thereby avoiding the potential for being allocated additional uplink slots.
GR4x to GR64
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GR4x to GR64 Migration Guide
2.2.3 UARTs
The GR64 has only two UART interfaces, unlike its predecessors which had three. For
legacy reasons the signal nomenclature has been retained, so that the original UART1
and UART3 still exist.
UART2 has been replaced by a reserved, peripheral interface.
2.2.4 Digital IO
The GM/GR4x series operated 2.78V digital IO. The newer technology of the GR64
utilizes 1.8V logic. To overcome interface difficulties with legacy applications, the
GR64 has level shifters on each of the IO interfaces.
The legacy variant GR64 references an internal 2.8V regulator, performing the
necessary bi-directional level translation. Some modification to existing user
interface circuitry may be necessary due to the internal impedance of the level shifters
themselves; this is detailed in a subsequent section.
The integrated SIM variant GR64 employs the same level shifters, and provides a VREF
input signal so that users can provide an application-side digital IO reference voltage
to the GR64 Wireless CPU®.
Migration Guide This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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GR4x to GR64
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GR4x to GR64 Migration Guide
2.2.5 PCM Audio
The GM/GR4x series implemented a PCM (digital) audio feature which permitted the
user to access the interface between the audio Codec and the DSP, which also allowed
additional DSP devices to be wired at this junction.
The GR64 baseband architecture does not lend itself to the same physical interface as
the predecessor hardware, since the digital audio is memory mapped to a parallel
data bus. However, the echo cancellation capability of GR64 is a vast improvement on
the predecessor series, and simply does not present the same challenges.
The legacy variant GR64 will allow legacy application PCBs, wired so that the
respective PCM uplink and downlink paths are connected, to remain unchanged.
However, any external circuitry connected to these pins will not function. Instead, the
advanced echo and noise canceling properties of the GR64 will compensate for the
loss of such circuitry.
A PCM audio interface is still available in a standard 4-pin implementation for the
integrated SIM variant GR64, using a Texas Instruments SSI implementation.
Fig A: GR4x implementation showing the PCM UL & DL paths wired together
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GR4x to GR64
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GR4x to GR64 Migration Guide
Fig B: GR4x implementation showing the PCM interfacing with an external DSP
Fig C: GR64 integrated SIM variant showing new signal allocation
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GR4x to GR64
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GR4x to GR64 Migration Guide
Fig D: GR64 Legacy variant showing removal of incompatible signal connectivity
Figures A through D illustrate the differences between signal implementation of the
GR64 and predecessor products. Users with application circuits that physically
connect the PCM signal between the CODEC and DSP of the GR4x series may use the
GR64 legacy variant without risking damage to the host circuitry or the Wireless
CPU®. In the legacy GR64 variant the links between pins 49 and 50 and their
respective onboard circuits are disconnected by means of no-mounted jumpers on
the Wireless CPU® itself.
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GR4x to GR64
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GR4x to GR64 Migration Guide
2.2.6 SIM Interface
The GR64 has support for 1.8V and 3.0V SIM cards, unlike the predecessor series
which supported 3.0V and 5.0V SIMs.
The integrated SIM variant GR64 also has the capability to support more than one SIM.
For this GR64 variant a secondary interface is available through the systems
connector. SIM detection in each holder signals the presence of SIM cards to the
GR64 which is able to selectively switch between SIMs.
Switching between Internal and External SIM holders is done by using the AT
command AT*ESSE. The Wireless CPU will not switch active SIM automatically when a
SIM card is removed or inserted, but it will detect the availability automatically.
2.2.7 DAC Interface
A hardware D to A converter was available to users in the GM/GR4x products. The
GR64 does not possess a hardware DAC, instead a programmable PWM signal is
available which can be used to create a DAC-like function on the host application.
2.2.8 ADC Interface
The A to D converter in the GR64 has a higher resolution (10-bit) compared with its
predecessor device (8-bit), and a different input range.
2.2.9 SPI
The GR64 no longer supports SPI as predecessors like the GR47 did.
2.2.10 Sleep Mode
Sleep mode functionality differs between GR64 and its predecessor products. For the
GR64, the customer must implement a mechanism to take advantage of the Sleep
Mode low current mode, whereas doing so was not necessary for predecessors
including the GR47.
For complete information regarding the Sleep Mode functionality of the GR64, please
refer to the GR64 Application Note entitled “UART Sleep Protocols”, available for
download on the Wavecom Web site.
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GR4x to GR64
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GR4x to GR64 Migration Guide
2.2.11 Mechanical Form Factor
The GR64 modem circuitry is significantly different to the predecessor device, being
far more highly integrated. The result is that the wireless modem is fabricated on one
side of the board. This single-sided arrangement results in a greatly reduced
thickness and the ability to retain one side of the board unpopulated, except for the
RF connector.
The GR64 mechanical outline remains the same as its predecessor devices. The
system connector placement, RF connector positioning, and mounting hole locations
are identical. The reduced thickness of the PCB (6-layer compared with the 10-layer
predecessor) means that the RF connector centre-line is approximately 0.2mm lower.
It is estimated that this will have no impact on existing applications, even those with
integrated mechanical housing.
Mechanically, therefore, the GR64 is a true drop-in replacement for the GM/GR4x
products. Comparative assemblies are shown in a subsequent section of this
document.
2.3 General Observations
The fundamental difference in hardware and platform architecture between the
GM/GR4x and the GR64 means that there are bound to be some incompatibilities.
These have been minimized through deliberate and thoughtful replication of the
legacy interfaces. Whilst every measure has been taken to create a functionally
comparable product in GR64, there will be the inevitable fine tuning adjustment of
applications to achieve a drop-in replacement. It has been the aim of Wavecom to
limit any changes to minor ones which are easily and quickly achievable, such as
component value changes.
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GR4x to GR64
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GR4x to GR64 Migration Guide
3Product Comparison
This section compares the GR64 with its predecessor GR47/48 products, since these
are the product that the GR64 was intended to most closely replicate. For all
practical purposes the comparisons also reflect the similarities and differences to the
GM47/48 since these products are merely a subset function of the GR products.
Comparison is made from an electrical signal, functional behavior, software and
mechanical perspective. A signal interface table identifies the proposed pin out and
signal assignment. A subsequent chapter reveals specific features of those signals
which are different in the GR64 implementation, and also provides generalized
information.
Mechanical drawings help the integrator to recognize differences in the basic profile
of the products, the GR64’s variant configurations, and inspect the mechanical
mounting arrangement to confirm drop-in compatibility.
3.1 GR64 Signal Interface
Pin Name Direction Function
1 VCC Input DC power
2 GND - Ground
3 VCC Input DC power
4 GND - Ground
5 VCC Input DC power
6 GND - Ground
7 VCC Input DC power
8 GND - Ground
9 VCC Input DC power
10 GND - Ground
11 CHG_IN Input Battery charger power
12 GND - Ground
ADIN4 Input ADC Input 4
13 GPIO5 In/Out General purpose IO
14 ON/OFF Input Device on/off control
15 SIMVCC Output 1.8V or 3.0V SIM card supply
16 SIMDET Input SIM presence detection
17 SIMRST Output SIM card reset signal
18 SIMDAT In/Out SIM card data
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GR4x to GR64
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GR4x to GR64 Migration Guide
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Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
Pin Name Direction Function
19 SIMCLK Output SIM card clock signal
20 DAC Output Pulse width modulated signal
21 GPIO1 In/Out General purpose IO
22 GPIO2 In/Out General purpose IO
23 GPIO3 In/Out General purpose IO
24 GPIO4 In/Out General purpose IO
25 VRTC Input DC supply for real time clock
26 ADIN1 Input ADC Input 1
27 ADIN2 Input ADC Input 2
28 ADIN3 Input ADC Input 3
29 SDA In/Out I2C data (2.8V logic)
30 SCL Output I2C clock signal (2.8V logic)
31 BUZZER Output Buzzer Output
DSR1 Output Data Set Ready (UART1)
32 GPIO7 In/Out General purpose IO
LED Output LED control signal
33 GPIO6 In/Out General purpose IO
34 VREF Output Core voltage reference
35 TX_ON Output Transmit indication
RI Output Ring Indicator
36 GPIO8 In/Out General purpose IO
DTR1 Input Data Terminal Ready (UART1)
37 GPIO10 In/Out General purpose IO
DCD1 Output Data Carrier Detect (UART1)
38 GPIO11 In/Out General purpose IO
RTS1 Input Ready To Send (UART1)
39 GPIO9 In/Out General purpose IO
CTS1 Output Clear To Send (UART1)
40 GPIO12 In/Out General purpose IO
41 DTM1 Input Data To Module from host (UART1)
42 DFM1 Output Data From Module to host (UART1)
43 DTM3 Input Data To Module from host (UART3)
44 DFM3 Output Data From Module to host (UART3)
45 Reserved - -
46 Reserved - -
47 SSPDTM Input Serial PCM data to module from host
48 SSPDFM Output Serial PCM data from module to host
GR4x to GR64
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GR4x to GR64 Migration Guide
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Pin Name Direction Function
49 Reserved - -
50 ALARM Output RTC alarm
51 SSPFS In/Out Serial PCM frame synchronization
52 SSPCLK In/Out Serial PCM clock
53 MICIP Input Microphone input positive
54 MICIN Input Microphone input negative
55 EARP Output Earpiece output positive
56 EARN Output Earpiece output negative
57 AUXO Output Auxiliary audio from module to host
58 SERVICE Input Flash programming enable signal
59 AUXI Input Auxiliary audio to module from host
60 AREF - Analogue reference
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GR4x to GR64 Migration Guide
3.2 Specific Signal Differences
The major differences between GR64 and its predecessors were summarized in
section 2. A further examination of the GR64 proposed signal interface in this section
draws attention to specific interfaces which differ from its predecessors.
This document aims to give legacy users an insight in to the major differences. The
detailed information for each interface, and its functional behaviour, is contained in
the relevant Integrators Manual and supplementary Application Notes.
3.2.1 Signal Functionality
Signal functionality and accessibility differs between product variants. The legacy
variant GR64 is designed to accommodate existing applications, but in doing so
sacrifices some its predecessors capability because of the nature of the newer
product platform (ASICs and software).
The following table identifies the differences, compared with the predecessor GM/GR
47/48 products, of the two major hardware variants of the GR64. The major effected
signals are further described in the succeeded sections. For the fullest information
on particular signal characteristics or their behaviour, integrators should refer to the
Integrators Manual and supplementary Application Notes.
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GR4x to GR64
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GR4x to GR64 Migration Guide
Pin Name GR64 Legacy Variant GR64 New Variant
1 VCC
2 GND
3 VCC
4 GND
5 VCC
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6 GND No Change No Change
7 VCC
8 GND
9 VCC
10 GND
11 CHG_IN Higher Vmax, Lower current Higher Vmax, Lower current
12 GND No Change No Change
ADIN4 ADC input range and bit
resolution differs
ADC input range and bit
resolution differs
13 GPIO5
14 ON/OFF Similar in behaviour Similar in behaviour
15 SIMVCC 1.8V & 3.0V only 1.8V & 3.0V only
16 SIMDET No change
17 SIMRST No change Internally & Externally
supported SIMs
18 SIMDAT No change
19 SIMCLK No change
20 DAC PWM output PWM output
21 GPIO1
22 GPIO2
23 GPIO3
Input/Output impedance
differs, due to level shifter
interfaces
Logic levels are application-
specific
24 GPIO4
25 VRTC Interface voltage is different Interface voltage is different
26 ADIN1
27 ADIN2 ADC input range and bit
resolution differs
ADC input range and bit
resolution differs
28 ADIN3
29 SDA No change No change
30 SCL No change No change
31 BUZZER Similar implementation Similar implementation
DSR1
32 GPIO7
LED
Input/Output impedance
differs, due to level shifter
interfaces
Logic levels are application-
specific
33 GPIO6
GR4x to GR64
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