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Subject: 7031/7041FI-1.3.6.0 Configuration Guide
This Configuration Guide is intended to illustrate the signal routing through the CMX7031 and
CMX7041 as a visual aid to configuring the device for each specific operation.
It is specific to Function ImageTM 7031/7041FI-1.3.6.0 although it may be
largely suitable for similar revisions.
The Configuration Guide is not intended to cover all of the hardware, functions or possible
set-up modes. It is a virtual representation of the device and does not reflect the true architecture.
[application note link]
Subject: CMX7041 - Two-Point Modulation for dPMR using the CMX7041
Two-point modulation is a simple and effective technique used for many years to provide baseband frequency
modulation for various modulation formats.
The move to continuous phase modulation in many radio systems
has led to the adoption of different modulation techniques, principally I/Q vector modulation for many
applications.
As a result the art of two-point modulation has been somewhat neglected and many RF engineers,
who have only worked with some of the more recent systems, are unfamiliar with the simplicity and
benefits of the two-point scheme.
[application note link].
Subject: CMX7031/CMX7041 - FI-2.0 for US 6.25kHz Digital Radio
The CMX7031 and CMX7041 devices use CML’s FirmASIC® technology to deliver multiple feature suites from a single flexible IC. A specific feature suite is determined by loading a particular Function Image™ into the IC, which allows the user to change device function and operation.
This capability allows a single CMX7031 or CMX7041 device to provide functions supporting all of analog only,
digital (voice) only, and multi-mode analog/digital voice radio designs.
[application note link].
Subject: CMX7031/CMX7041 - Writing a Function ImageTM File to Serial Memory
The CMX703x and CMX704x devices require a Function ImageTM to be loaded from an external memory as part of an
initialisation routine.
Because it is likely that a Function ImageTM will be programmed into the target board once or very few times,
a low endurance memory is sufficient.
The small footprint and compact bus width make standalone EEPROM or the newer, flash-based, Serial
PROM a good choice. Once mounted in the target system, it is preferable to program this serial memory using the
CMX703x or CMX704x.
This Application Note discusses how to use the in-circuit programming capability of Thick Stub Function
ImagesTM.
[application note link].
Subject: CMX7031/CMX7041 - NOAA Weather Radio Operations
The National Oceanographic and Atmospheric Administration (NOAA), a USA government agency, continuously
transmits weather and public emergency information throughout the United States.
These broadcasts, commonly referred to as NOAA Weather Radio or NWR, can be freely received by radios that
have been designed to receive these signals.
This purpose of this document is to describe the NOAA Weather Radio (NWR) service and how the
CMX7031 or CMX7041 can serve in this application.
Anyone designing two-way radio equipment with the CMX7031 or CMX7041 can potentially benefit from the
information contained in this application note.
[application note link].
Subject: CMX7041 - Boot Procedure
To prevent incorrect operation of the CMX7041 after power-up it is important to ensure that the BOOTEN pins do
not acquire an illegal state during power-up.
Should this happen, there is a very small possibility that the CMX7041 will not operate.
This application note describes the mechanism and correct operating procedure.
[application note link].