Erratic trace measurements | HP 16501A LOGIC, 16500C guide

If You Have a Problem

Erratic trace measurements

Try doing a full reset of the target system before beginning the measurement.

Some preprocessor designs require a full reset to ensure correct configuration.

Ensure that your target system meets the timing requirements of the processor with the preprocessor probe installed.

See “Capacitive Loading” in this chapter. While preprocessor loading is slight, pin protectors, extenders, and adapters may increase it to unacceptable levels. If the target system design has poor timing margins, such loading may cause incorrect processor functioning, giving erratic trace results.

Ensure that you have sufficient cooling for the preprocessor probe.

Current processors such as the i486, Pentium™, and MC68040 generate substantial heat. This is exacerbated by the active circuitry on the preprocessor board. You should ensure that you have ambient temperature conditions and airflow that meet or exceed the requirements of the microprocessor manufacturer.

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HP 16501A LOGIC, 16500C manual Erratic trace measurements

Contents

HP 16500C /16501A Logic Analysis System Powerful, easy-to-use interface Install measurement modules in any slotCalibrate measurement modules after installation System of measurement modules Iii Page This Book See Also HP 16500C /16501A Logic Analysis System User’s Reference Contents Special displays Skew AdjustmentContents Intermodule Measurement Problems Preprocessor ProblemsInverse Assembler Problems Messages Triggering Triggering To store and time the execution of a subroutine To store and time the execution of a subroutineSelect the state analyzer Trigger menu Set Count to Time To store and time the execution of a subroutine Example As shown in the display To trigger on the nth iteration of a loop To trigger on the nth iteration of a loopSelect the state analyzer Trigger menu To trigger on the nth recursive call of a recursive function Triggering on the 22nd Call of a Recursive Function To trigger on entry to a function To trigger on entry to a function Triggering on Entry to a Function Capturing a Bad Write to a Variable To trigger on a loop that occasionally runs too long To trigger on a loop that occasionally runs too long Verifying Correct Return from a Function Call To trigger after all status bus lines finish transitioning To trigger after all status bus lines finish transitioning To find the nth assertion of a chip select line To find the nth assertion of a chip select line Verifying Setup Time for Memory Address Select the timing analyzer Trigger menu Triggering When I/O Data Not Returned To test minimum and maximum pulse limits To test minimum and maximum pulse limits Triggering when a Pulse Exceeds Minimum or Maximum Limits To detect a handshake violation To detect a handshake violation To detect bus contention To detect bus contention Intermodule Measurements Cross-Arming Trigger ExamplesMade by the two analyzers To examine software execution when a timing violation occurs Trigger on arm ∙ Edge1 1 time Intermodule Measurements Intermodule Measurements Intermodule Measurements Select the Group Run field in the upper right hand corner To set up a group run of modules within the HP 16500CIntermodule Measurement Examples To set up a group run of modules within the HP 16500C Start the external instrument or system State Analyzer and Oscilloscope armed from Port Select the Port OUT Source field Select Done in the Port IN/OUT Setup menuSelect Port IN/OUT Driving the Port Out BNC in an Intermodule Measurement Intermodule Measurements Module Status Intermodule Measurements Module Time Correlation To use a timing analyzer to detect a glitch To use a timing analyzer to detect a glitch To capture the waveform of a glitch To capture the waveform of a glitch Intermodule Measurements Select the Intermodule menu To test a circuit using stimulus-responseTo test a circuit using stimulus-response Intermodule Measurements Intermodule Measurements Special Displays in this chapter Special displays Interleaved Trace Lists To interleave trace lists To interleave trace lists Interleaved Trace Lists on the HP 16550A Select the module for which you wish to show waveforms Skew Adjustment in this chapter Skew Adjustment Select Group Run Connect an input signal from each module to the same signalSet up the trigger conditions for each module Record the differences shown by the two modules File Management File Management Transferring Files Using the Flexible Disk Drive To save a measurement configuration To save a measurement configuration Saving the Oscilloscope Configuration for Skew Testing To load a measurement configuration To load a measurement configuration To load a measurement configuration To save a trace list in Ascii format To save a trace list in Ascii format Part of a Trace Listing Saved as an Ascii File To save a menu or measurement as a graphic image To save a menu or measurement as a graphic image An Oscilloscope Display Saved as a TIF Image To load system software To load system software Using the LAN Interface To set up the HP 16500C To set up the HP 16500C To set up the HP 16500C Example HP 16500C System Programmer’s Guide for more information on Set up the system for the measurement you want to make Run the analyzer to acquire data \ copy L\slotc\data.asc\68000bus\addrlo local path name \system\graphics Concepts Concepts Trigger Sequence Specification Trigger Sequencer Sequence-Advance Specification Trigger specification can look like the following Analyzer Resources For example Limitations Affecting Use of Analyzer Resources HP 16550A Resource Division Group Pair Resource Operation Pair Links Timing Analyzer Inverse Assembler Inverse Assembly Synchronization Symbols Preprocessor User’s Guide for more information on switchSettings Configuration Translation for Analyzer Modules Concepts Concepts Page If You Have a Problem If You Have a Problem Unwanted triggers Analyzer ProblemsIntermittent data errors No Setup/Hold field on format screen No activity on activity indicatorsNo Setup/Hold field on format screen Capacitive loading No trace list display No trace list display Preprocessor Problems Target system will not boot up Slow clock Slow clockErratic trace measurements Erratic trace measurements Inverse Assembler Problems No inverse assembly or incorrect inverse assembly Inverse assembler will not load or run Inverse assembler will not load or run Intermodule Measurement Problems An event wasn’t captured by one of the modules Inverse Assembler Not Found Default Calibration Factors Loaded HP 16540, 16541,Messages Measurement Initialization Error Measurement Initialization Error No Configuration File Loaded No Configuration File LoadedSelected File is Incompatible Slow or Missing Clock Time from Arm Greater Than 41.93 ms State Clock Violates Overdrive SpecificationState Clock Violates Overdrive Specification Waiting for Trigger Waiting for Trigger Application Notes Application Notes Application Notes and Product Notes Application Notes Page Glossary Attenuation factor Input impedance Glossary-3 Div See horizontal sweep speed State sequence levels The indi Glossary-6 Glossary-7 Glossary-8 Index Data Index-2 Index-3 Index-4 Document Warranty Product Warranty