EV9902A Datasheet, PDF (19/23 Pages) CML Microcircuits – Measures Bit Error Rate

Interface Kit for EV9900A
EV9902
Before starting a measurement check the software settings to ensure that:
• The Tx tab is set to transmit and the Rx tab is set to receive.
• Tx/Rx tabs have the same measurement type, i.e. unit based or continuous
measurement.
• Bit sync., frame sync., and control data bytes are the same on Tx/Rx tabs.
• Tx/Rx tabs have the same formatting, i.e. raw data or Mobitex mode.
• The selected bit count is the same for Tx/Rx tabs if carrying out a unit based
measurement in raw data mode.
• The selected block count is the same for Tx/Rx tabs if carrying out a unit based
measurement in Mobitex mode.
• The selected frame size is the same for Tx/Rx tabs if carrying out a measurement in
Mobitex mode.
• The selected bit rate setting is the same on Tx/Rx tabs and also that the setting is the
same as the bit rate setting programmed into the CMX990.
Once all settings have been made and checked for transmit and receive tabs then the procedure
for starting the measurement is as follows:
• Press the Start button on the receive tab. The Measurement status box will display the
text ‘Searching for frame sync’.
• Press the Start button on the transmit tab. The Measurement status box should display
the text ‘Measurement running’. The bit/block count will be updated continuously with the
number of bits/blocks transmitted. If the receive board detects the transmitted frame sync.
then the Measurement status box on the receive tab will change to ‘Measurement
running’ and the bit/block count will be continuously updated with the number of
bits/blocks received. If receive errors occur then the error count and error percentage will
be updated accordingly.
6.2. Firmware Description
The hyBoard-XS included with this kit is supplied preloaded with the latest version of the EF9900
firmware. The firmware acts as an interface between the ES9902 application and the EV9900A
evaluation board. It receives commands from the ES9902 application, via the USB port, and
performs the appropriate actions. All the modem transfer and bit error rate measurement
operations are performed by the firmware in real-time and the results reported back to the
ES9902 application.
6.2.1. Updating the Firmware
The EF9902 firmware loaded onto the hyBoard-XS can be updated via the USB port using the
supplied ESFlash application. To re-program the hyBoard-XS flash:
1. Run the ESFlashxx.exe (where xx is the version number) executable
2. Select EV9902 as the target type
3. Select the required ‘.bin’ file by clicking on the ‘Load File’ button
4. Click the ‘Program’ button
5. When prompted, set the position of the hyBoard-XS jumper, ST13, to 5-6 and press the
reset button, S1
6. Wait for the hyBoard-XS LED, LED6, to flicker and then remain on
7. When prompted, set the position of the hyBoard-XS jumper, ST13, to 1-2
Once the hyBoard-XS flash has been reprogrammed, it can be run by pressing the reset button,
S1, or by cycling the power supply to the hyBoard-XS.
© 2009 CML Microsystems Plc
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UM9902/3