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Troubleshooting 5
16800 Series Portable Logic Analyzers Service Guide 93
Clock Test
The clock test verifies that three clock modes can be set to
verify both phase- locked loop (PLL) clock generators are
functioning. Additionally, the clock test verifies the
RUN/STOP control circuit is functional. Parts of the module
backplane interface IC and the intermodule bus (IMB) are
also tested.
Passing the clock test implies that the module can generate
clocks through the advertised frequency range.
In case of error, the following diagnostic integer will be
displayed.
The four bit values have the following definition:
0 - passed
1 - failed to run
2 - failed to stop
Simple RAM Test
The RAM test verifies that the entire module memory is
functioning. Patterns of all0, then all1, then alternating
“0” and “1” are written, read, and compared with known
values.
Passing the simple RAM test verifies that all of the module
RAM is functioning properly.
In case of error, the following diagnostic integer indicating
the status of the memory IC number will be displayed.
The one bit value has the following definition:
0 - passed
1 - failed
Bit#: 15 - 12 11 - 8 7 - 4 3 - 0
300 MHz clock 200 MHz clock 100 MHz clock not used
Bit#15 - 7 6543210
not
used
#7&8654321
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