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Intermittent Data
Errors
Bent Pins
"Time from Arm
Greater Than
41.93 ms.
11
No Setup/Hold
Field on Format
Screen
"Default
Calibration
Factors Loaded"
(16540/41/42)
HP E2418A
This problem is usually caused by incorrect signal levels. Adjust the
threshold level of the data pod. Use an oscilloscope to check the signal
integrity of the data lines, as needed.
Bent pins on the preprocessor interface, pin protectors, or adapters
can cause system errors or inverse assembly errors. Ensure all pins are
properly aligned and making contact.
The state/timing analyzers have a counter to keep track of the time
from when an analyzer is armed to when it triggers. The width and
clock rate of this counter allow it to count for up to 41.93 ms before it
overflows. Once the counter has overflowed, the system does not have
the data it needs to calculate the time between module triggers. The
system must know this time to be able to display data from multiple
modules on a single screen.
The HP 16540/16541A,D or HP 16542A Logic Analyzer cards are not
calibrated. Refer to your logic analyzer reference manual for
procedures to calibrate the cards.
The default calibration file for the logic analyzer was loaded. The logic
analyzer must be calibrated when using HP 16540A,D, HP 16541A,D
or HP 16542A cards. Refer to your logic analyzer manual for
procedures to calibrate the master clocking system, and ensure that the
"cal factors" file is saved.
TMS32020/C25 Preprocessor Interface
Troubleshooting
A-5
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