Incorrect Inverse Assembly; No Activity On Activity Indicators; Capacitive Loading - HP 10314D User Manual

Incorrect Inverse
This problem is usually caused by a hardware problem in the target
Assembly
system. A locked status line will often cause incorrect or incomplete
inverse assembly.
No Activity on
Activity Indicators
Capacitive
Loading
Troubleshooting
A-4
• Check the activity indicators for status lines locked in a high or
low state.
• Verify that the
STAT, DATA,
and
ADDR
format labels have not
been modified from their default values. These labels must
remain as they are configured by the configuration file.
• Verify that the memory manager has been disabled. In most
cases, if the microprocessor memory manager remains enabled
you should still get inverse assembly, but it may be incorrect since
some of the execution trace was not visible to the logic analyzer.
• Verify that storage qualification has not excluded storage of all
the needed opcodes and operands.
On the
HP 1650A, HP 1651A,
and
HP 16510A
Logic Analyzers if there
is no activity the fuse which allows power to the preprocessor interface
is probably blown. Check the fuse in the logic analyzer. On the other
logic analyzers, if there is no activity, one of the cables, board
connections, or preprocessor interface connections is probably loose.
Check all connections.
Excessive capacitive loading can cause signals to degrade, resulting in
incorrect capture by the preprocessor interface or system lockup in the
microprocessor. All preprocessor interfaces add additional capacitive
loading. The following techniques will reduce the capacitive loading:
• Remove as many pin protectors, extenders, and adapters as
possible.
• If multiple preprocessor interface solutions are available,
try
using one with lower capacitive loading.
HP 103140
80386DX Preprocessor Interface