Evaluation Kit User Manual
EV9000
2001 Consumer Microcircuits Limited
13
UM9000/2
2.4
Third - Select and Execute a Test
1.
Use the Test Selection list box to select Test 7: "Tx user defined packet from B to A driving
PTT and starting acquire on CS". This test will exercise the two modem channels to transfer
a complete message from channel B to channel A. The message makes use of realistic
block types (e.g. Header, Intermediate, and Last blocks) to expose the transmit parameters
and receive information which are involved in a message transfer. In addition, other
information such as the state of the modems’ data quality outputs are observed and
recorded during the course of the experiment. See Section 4.6.6 for a more detailed
description of this test. Please note that this test does not exist in the EV9690xx.EXE
software.
Probes may also be attached to the modem circuits to observe the sequence of hardware
events involved in the transmit and receive process. Test 7 asserts PTT on transmit and
uses CS to trigger the reception process on the receive channel (A). These are important
signals in most wireless systems: Push To Talk is used to key on a radio transmitter and
Carrier Sense is asserted by a radio receiver to trigger a receive modem’s receive process.
2.
Click on the
GO
button. A window containing various transmit message parameters will
appear. These parameters are set to defaults which should be retained for the Quick Start
procedure to avoid inadvertently selecting inappropriate values which could cause the test to
fail. (After the test is operating successfully, go ahead and experiment with modifications.)
3.
Click on the
OK
button to accept the displayed transmit message parameters and execute
the test. The test should finish within a few seconds, displaying a new window containing
receive message information. (If there is no response, the message transfer has failed.
Push and release the HALT switch to abort the test. Check your steps and repeat them if
necessary to make sure they were executed correctly. If the test still will not pass, it is likely
that the motherboard gain and bias adjustments may have been changed from the factory
settings. Refer to Section 3.3 for a description of the adjustment procedure.)
4.
The receive message information window reports received data and other important
information e.g. CRC received error check indications. After examining it, click on the
OK
button to proceed. A window will appear presenting you with the opportunity to save the
complete test results to a disk file. If desired, click
OK
to save your results and select a file
name and location.
2.5
Fourth - Explore
Now that you have successfully set up and operated the EV9000 to transfer complete messages,
you can perform many other experiments using your own configurations. Some possibilities are:
measure bit error rates, develop Rx eye diagrams, and determine the affects of noise and dc
offset. You can even integrate the EV9000 with your own rf system.
Read Section 3 Hardware and Section 4 Software to learn more details to support your own
designs.