User's Manual
Table Of Contents
- Bookcase
- TABLE OF CONTENTS
- LIST OF FIGURES
- LIST OF TABLES
- About This Manual
- Chapter 1 Introduction
- Chapter 2 Command Dictionary
- Command Summary
- Command Descriptions
- Abort Interrupted Process
- Add Ambiguous Paths
- Add Atpg Constraints
- Add Atpg Functions
- Add Capture Handling
- Add Cell Constraints
- Add Cell Library
- Add Clocks
- Add Cone Blocks
- Add Control Points
- Add Display Instances
- Add Display Loop
- Add Display Path
- Add Display Scanpath
- Add Faults
- Add Iddq Constraints
- Add Initial States
- Add LFSR Connections
- Add LFSR Taps
- Add LFSRs
- Add Lists
- Add Mos Direction
- Add Net Property
- Add Nofaults
- Add Nonscan Handling
- Add Notest Points
- Add Observe Points
- Add Output Masks
- Add Pin Constraints
- Add Pin Equivalences
- Add Pin Strobes
- Add Primary Inputs
- Add Primary Outputs
- Add Random Weights
- Add Read Controls
- Add Scan Chains
- Add Scan Groups
- Add Scan Instances
- Add Scan Models
- Add Slow Pad
- Add Tied Signals
- Add Write Controls
- Analyze Atpg Constraints
- Analyze Bus
- Analyze Control
- Analyze Control Signals
- Analyze Drc Violation
- Analyze Fault
- Analyze Observe
- Analyze Race
- Analyze Restrictions
- Close Schematic Viewer
- Compress Patterns
- Create Initialization Patterns
- Create Patterns
- Delete Atpg Constraints
- Delete Atpg Functions
- Delete Capture Handling
- Delete Cell Constraints
- Delete Clocks
- Delete Cone Blocks
- Delete Control Points
- Delete Display Instances
- Delete Faults
- Delete Iddq Constraints
- Delete Initial States
- Delete LFSR Connections
- Delete LFSR Taps
- Delete LFSRs
- Delete Lists
- Delete Mos Direction
- Delete Net Property
- Delete Nofaults
- Delete Nonscan Handling
- Delete Notest Points
- Delete Observe Points
- Delete Output Masks
- Delete Paths
- Delete Pin Constraints
- Delete Pin Equivalences
- Delete Pin Strobes
- Delete Primary Inputs
- Delete Primary Outputs
- Delete Random Weights
- Delete Read Controls
- Delete Scan Chains
- Delete Scan Groups
- Delete Scan Instances
- Delete Scan Models
- Delete Slow Pad
- Delete Tied Signals
- Delete Write Controls
- Diagnose Failures
- Dofile
- Exit
- Extract Subckts
- Flatten Model
- Flatten Subckt
- Help
- Insert Testability
- Load Faults
- Load Paths
- Macrotest
- Mark
- Open Schematic Viewer
- Read Modelfile
- Read Procfile
- Read Subckts Library
- Redo Display
- Report Aborted Faults
- Report Atpg Constraints
- Report Atpg Functions
- Report AU Faults
- Report Bus Data
- Report Capture Handling
- Report Cell Constraints
- Report Clocks
- Report Cone Blocks
- Report Control Data
- Report Control Points
- Report Core Memory
- Report Display Instances
- Report Drc Rules
- Report Environment
- Report Failures
- Report Faults
- Report Feedback Paths
- Report Flatten Rules
- Report Gates
- Report Hosts
- Report Id Stamp
- Report Iddq Constraints
- Report Initial States
- Report LFSR Connections
- Report LFSRs
- Report Lists
- Report Loops
- Report Mos Direction
- Report Net Properties
- Report Nofaults
- Report Nonscan Cells
- Report Nonscan Handling
- Report Notest Points
- Report Observe Data
- Report Observe Points
- Report Output Masks
- Report Paths
- Report Pin Constraints
- Report Pin Equivalences
- Report Pin Strobes
- Report Primary Inputs
- Report Primary Outputs
- Report Procedure
- Report Pulse Generators
- Report Random Weights
- Report Read Controls
- Report Scan Cells
- Report Scan Chains
- Report Scan Groups
- Report Scan Instances
- Report Scan Models
- Report Seq_transparent Procedures
- Report Slow Pads
- Report Statistics
- Report Test Stimulus
- Report Testability Data
- Report Tied Signals
- Report Timeplate
- Report Version Data
- Report Write Controls
- Reset Au Faults
- Reset State
- Resume Interrupted Process
- Run
- Save Flattened Model
- Save Patterns
- Save Schematic
- Select Iddq Patterns
- Select Object
- Set Abort Limit
- Set Atpg Compression
- Set Atpg Limits
- Set Atpg Window
- Set AU Analysis
- Set Bist Initialization
- Set Bus Handling
- Set Bus Simulation
- Set Capture Clock
- Set Capture Handling
- Set Capture Limit
- Set Checkpoint
- Set Clock Restriction
- Set Clock_off Simulation
- Set Clockpo Patterns
- Set Contention Check
- Set Control Threshold
- Set Decision Order
- Set Dofile Abort
- Set Drc Handling
- Set Driver Restriction
- Set Fails Report
- Set Fault Mode
- Set Fault Sampling
- Set Fault Type
- Set Flatten Handling
- Set Gate Level
- Set Gate Report
- Set Hypertrophic Limit
- Set Iddq Checks
- Set Iddq Strobe
- Set Instancename Visibility
- Set Instruction Atpg
- Set Internal Fault
- Set Internal Name
- Set Interrupt Handling
- Set IO Mask
- Set Learn Report
- Set List File
- Set Logfile Handling
- Set Loop Handling
- Set Multiple Load
- Set Net Dominance
- Set Net Resolution
- Set Nonscan Model
- Set Number Shifts
- Set Observation Point
- Set Observe Threshold
- Set Output Comparison
- Set Output Mask
- Set Pathdelay Holdpi
- Set Pattern Source
- Set Possible Credit
- Set Procedure Cycle_checking
- Set Pulse Generators
- Set Race Data
- Set Rail Strength
- Set Ram Initialization
- Set Ram Test
- Set Random Atpg
- Set Random Clocks
- Set Random Patterns
- Set Random Weights
- Set Redundancy Identification
- Set Schematic Display
- Set Screen Display
- Set Self Initialization
- Set Sensitization Checking
- Set Sequential Learning
- Set Shadow Check
- Set Simulation Mode
- Set Skewed Load
- Set Split Capture_cycle
- Set Stability Check
- Set Static Learning
- Set Stg Extraction
- Set System Mode
- Set Test Cycle
- Set Trace Report
- Set Transition Holdpi
- Set Unused Net
- Set Workspace Size
- Set Xclock Handling
- Set Z Handling
- Set Zhold Behavior
- Set Zoom Factor
- Setup Checkpoint
- Setup LFSRs
- Setup Pin Constraints
- Setup Pin Strobes
- Setup Tied Signals
- Step
- System
- Undo Display
- Unmark
- Unselect Object
- Update Implication Detections
- View
- View Area
- Write Core Memory
- Write Environment
- Write Failures
- Write Faults
- Write Initial States
- Write Library_verification Setup
- Write Loops
- Write Modelfile
- Write Netlist
- Write Paths
- Write Primary Inputs
- Write Primary Outputs
- Write Procfile
- Write Statistics
- Write Timeplate
- Zoom In
- Zoom Out
- Chapter 3 Shell Commands
- Chapter 4 Test Pattern File Formats
- Chapter 5 Distributed FlexTest
- Appendix A Timing Command Dictionary
- Appendix B FlexTest WDB Translation Support
- INDEX
- Send us feedback
Command Dictionary Select Iddq Patterns
FastScan and FlexTest Reference Manual, V8.6_4
2-419
statement. (FastScan gives the normal fault simulation message after each
set of 32 patterns.) The tool uses this simulation to calculate the final test
coverage and also to give credit for the possibly-detected faults.
After the tool finishes this IDDQ pattern selection process, you can save the
selected patterns to an external file with the Save Patterns command.
FlexTest Specifics
FlexTest may run out of memory during step 1 of the selection process if you are
working with a large design with the default -Exhaustive switch active. This is
because the -Exhaustive switch causes FlexTest to simulate all the IDDQ
measurements, without fault dropping, before beginning the selection process. To
do this, FlexTest creates a table to keep track of which faults it detects in each
measurement. In some cases the table size can be too large for the amount of
available memory.
To circumvent the memory problem, you can use the -Window switch in
combination with the -Exhaustive switch to define how many measurements
FlexTest is to allow in the table. If you allow fewer IDDQ measurements in the
table than the total number of IDDQ measurements in the simulation, FlexTest
makes multiple passes until it simulates all measurements.
When you specify the -Window switch, FlexTest still keeps track of the
simulation results and enters them into the table. However, when the table is full,
FlexTest pauses the simulation and begins the selection process outlined in step
2a. When the selection process is complete on that window’s worth of
measurements, FlexTest keeps only the qualified IDDQ measurements in the
table. FlexTest then begins simulating the next set of measures, using the
remaining space in the detection table. It repeats this simulation, followed by the
selection process, until it simulates the entire pattern set. For this method to work,
the window size must be at least two times the -Max_measures number (unless the
window size is large enough to hold all the IDDQ measurements.)
The -TEst_coverage switch allows you to stop the selection process if the selected
IDDQ measurements can reach the specified test coverage.