Application E xamp les
Tracking Down Bus Anomalies
In this example, you are testing your new I
2
C circuit. Something is not working. You tell the master IC to send a message to the
slave IC. Then you expect to receive data back and an LED to light. The light never goes on. Where in the ten or so commands that
were sent out did the problem occur? Once you locate the problem location, how do you determine what went wrong?
You can use your DPO40 00 Series oscilloscope, with its serial triggering and long-record length management features, to track
down the problem in b oth the physical layer and in the protocol layer of the bu s.
Basic strategy
First, you will display and acquire the bus signal by setting up the bu s parameters and trigger. Then, you will search throu gh each
packet with the search/mark functions.
NOTE. Triggering on bus signals requires use of the DPO4EMBD or the DPO4AUTO Serial Triggering and Analysis Module.
238 DPO4000 Series User Manual
To Next Page
Loading...
Need help?
General
