HP 16500C, 16501A LOGIC The Trigger Sequencer, Trigger Sequence Specification

The Trigger Sequencer

Logic state and timing analyzer modules for the HP 16500C have triggering and data storage features that allow you to capture only the system activity of interest. Understanding how these features work will help you set up analyzer trigger specifications that satisfy your measurement needs.

There are several different logic analyzers available for the

HP 16500C. This discussion will focus on the HP 16550A, a 100-MHz state/500-MHz timing analyzer. Most HP logic analyzers will be similar, differing only in the number of available states, pattern resources, range resources, and acquisition memory depth.

In the HP 16550A state analyzer, the trigger sequencer is a state machine with a minimum of two states and a maximum of twelve states. The trigger term can be any one of these states except the last. The analyzer searches for a trigger sequence by matching input values on the pods to branch conditions, which control transitions between states. You can insert or delete states to make the trigger sequence as simple or complex as needed for your application.

Trigger Sequence Specification

See the following figure, which shows a sequence specification with four states. To define the trigger sequence, you specify sequence-advance, sequence-else, storage, and trigger-on specifications.

4–3

Contents

HP 16500C /16501A Logic Analysis System HP 16500C—Ata Glance A system of measurement modules A powerful, easy-to-useinterface The HP 16501A expands module capacity Install measurement modules in any slot Page Page In This Book Triggering Intermodule Measurements File Management Concepts See Also Contents 1 Triggering 2 Intermodule Measurements Contents 3 File Management 4Concepts 5If You Have a Problem Analyzer Problems 5–3 6Application Notes Glossary Index Triggering Triggering To store and time the execution of a subroutine To store and time the execution of a subroutine Example To trigger on the nth iteration of a loop To trigger on the nth iteration of a loop To trigger on the nth recursive call of a recursive function To trigger on the nth recursive call of a recursive function Page To trigger on entry to a function To trigger on entry to a function Page To capture a write of known bad data to a particular variable To capture a write of known bad data to a particular variable To trigger on a loop that occasionally runs too long To trigger on a loop that occasionally runs too long Page 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 Page Page Page To test minimum and maximum pulse limits To test minimum and maximum pulse limits Page To detect a handshake violation To detect bus contention To detect bus contention Cross-ArmingTrigger Examples To examine software execution when a timing violation occurs To examine software execution when a timing violation occurs To look at control and status signals during execution of a routine To look at control and status signals during execution of a routine Intermodule Measurements Intermodule Measurements Page Intermodule Measurement Examples To set up a group run of modules within the HP 16500C To start a group run of modules from an external trigger source To start a group run of modules from an external trigger source Page Page Page To see the status of a module within an intermodule measurement To see the status of a module within an intermodule measurement Page To see time correlation of each module within an intermodule measurement To see time correlation of each module within an intermodule measurement Page 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 To capture state flow showing how your target system processes an interrupt To capture state flow showing how your target system processes an interrupt To test a circuit using stimulus-response To test a circuit using stimulus-response Page To monitor the activity of two coprocessors in a target system To monitor the activity of two coprocessors in a target system Page Special displays Interleaved Trace Lists Mixed Display Mode To interleave trace lists To interleave trace lists Page To view trace lists and waveforms together on the same display To view trace lists and waveforms together on the same display Page Skew Adjustment Page Page File Management File Management Transferring Files Using the Flexible Disk Drive To save a measurement configuration To save a measurement configuration Page To load a measurement configuration To load a measurement configuration Page To save a trace list in ASCII format To save a trace list in ASCII format Page To save a menu or measurement as a graphic image To save a menu or measurement as a graphic image Page To load system software To load system software Using the LAN Interface To set up the HP 16500C To set up the HP 16500C Page To transfer data files from the HP 16500C system to your computer To transfer data files from the HP 16500C system to your computer Page To transfer graphics files from the HP 16500C system to your computer To transfer graphics files from the HP 16500C system to your computer Concepts Concepts The Trigger Sequencer Trigger Sequence Specification Page Sequence-ElseSpecification Storage Specification TRIGGER On Specification Analyzer Resources Page Table HP 16550A Resource Division The Timing Analyzer The Inverse Assembler Page Symbols Configuration Translation for Analyzer Modules Page Page Page If You Have a Problem If You Have a Problem Analyzer Problems No Setup/Hold field on format screen No Setup/Hold field on format screen No activity on activity indicators Capacitive loading No trace list display No trace list display Preprocessor Problems Slow clock Slow clock Erratic trace measurements Erratic trace measurements Inverse Assembler Problems Inverse assembler will not load or run Inverse assembler will not load or run Intermodule Measurement Problems Messages “Measurement Initialization Error” “Measurement Initialization Error” “No Configuration File Loaded” “No Configuration File Loaded” “Selected File is Incompatible” “Slow or Missing Clock” “State Clock Violates Overdrive Specification” “State Clock Violates Overdrive Specification” “Time from Arm Greater Than 41.93 ms” “Waiting for Trigger” “Waiting for Trigger” Application Notes Application Notes Page Page Glossary attenuation factor cancel run coupling field deskewing edge mode glitch high horizontal position See delay field labels low module field panning pattern terms range terms run, repetitive mode See repetitive mode run, single mode See single mode s/Div sequence-advancespecification source field state sequence levels The indi terms toggle field trigger point vertical position See offset field. V/div See vertical sensitivity when field Page Index