Simulator Configuration Guide for Synopsys Models

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Chapter 7: Using QuickSim II with Synopsys ModelsSimulator Configuration GuideTo select Shell Software timing every time you invoke QuickSim II with a particulardesign, you can create or edit a quicksim.startup file under the design viewpoint. Addthe following line to the file to directly call the function that implements this SignalInstance command:$signal_instances("lst", "all", "/I$1");Substitute the instance name of any hardware modeled device for /I$1.You can also use the actual measured delays from the device as an alternative timingoption with hardware models. For more information about this feature, refer to “TimingMeasurement” on page 182.Performance MonitoringYou can monitor the performance of the hardware modeler and append the results to thesimulator log file after simulation. To enable performance monitoring, in the windowwhere you are running the simulator, enter the following:% setenv LM_OPTION “monitor_performance”For more information, refer to “Performance Monitoring” in the ModelSource User’sManual.Unknown Handling and PropagationThe unknown handling and propagation commands enable you to modify the hardwaremodeling system’s default handling of device input and I/O pins that the simulator setsto unknown.Unknown MappingSince the hardware modeling system cannot present an unknown logic level to aphysical device, unknown values presented to inputs of hardware models must bemapped to known values. The SIGnal INSTance xp, x0, x1, and xz commands mapunknowns for all instances of the selected components to the previous state, logic zero,logic one, or high-impedance (float), respectively. By default, unknowns are mapped tothe previous state. Unknowns mapped to high-impedance are also mapped to theprevious state.You can customize unknown handling per pin by using the -p pin_name argument. Forexample, you can issue the following:sig inst x0sig inst x1 -p clk1These commands map all unknowns for the selected components—except for unknownsreceived on the clk1 pin—to logic zero (0). Any unknowns received on clk1 are mappedto logic one (1).180 Synopsys, Inc. October 6, 2003
Simulator Configuration GuideChapter 7: Using QuickSim II with Synopsys ModelsThese Signal Instance commands perform the same function as the Shell Softwareon_unknown statement, and the set_previous, set_low, set_high, and set_float attributesof the in_pin and io_pin statements. For more information, refer to the Shell SoftwareReference Manual. Note that explicit Shell Software settings override any SignalInstance commands.Unknown PropagationThe SIGnal INSTance propagate command turns on unknown propagation for allinstances of the selected components. The modeling system propagates the unknownsthrough the model using multi-sequence pattern play. The SIGnal INSTancenopropagate command turns off unknown propagation for all instances of the currentlyselected component, which is the default behavior.When unknown propagation is on, two pattern sequences are used by default. However,you can specify up to twenty additional sequences with the default_propagation -pnumber command, for a total of 22 sequences. You can also specify the value of the seedfor the random sequence generator with the random_seed -p seed command. The valueof the seed is 0 by default, but any number from 0 to 65,535 can be used.For example, you can issue the following:sig inst propagatesig inst default_propagation -p 8sig inst random_seed -p 7896These commands turn unknown propagation on for all instances of the selectedcomponents. The modeling system plays a total of ten sequences (the primary,secondary, and eight additional sequences) per instance to the device, and uses therandom sequence seed 7,896.These Signal Instance commands perform the same function as the Shell Softwareon_unknown statement. Note that explicit Shell Software settings override any SignalInstance commands, except for when the SIGnal INSTance nopropagate command isused. This exception allows the simulator to turn off unknown propagation if themodeling system is running out of pattern memory. For more information aboutunknown propagation, refer to the Shell Software Reference Manual and the LM-familyModeler Manual or the ModelSource User’s Manual.Indeterminate Strength MappingThe SIGnal INSTance is and SIGnal INSTance iz commands enable you to mapindeterminate strength pin values received on inputs of hardware models to either strong(hard) or high-impedance (float) strengths. The modeling system treats high-impedancestrength pin values as unknowns and maps or propagates them accordingly. By default,the system maps indeterminate strengths to strong strengths.October 6, 2003 Synopsys, Inc. 181
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Simulator ConfigurationGuide for Sy
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ContentsSimulator Configuration Gui
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PrefaceSimulator Configuration Guid
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Chapter 1: Using Synopsys Models wi
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Chapter 2: Using VCS with Synopsys
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Chapter 3: Using ModelSim Verilog w
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Chapter 7: Using QuickSim II with S
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Chapter 10: Using SystemC with Syno
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Appendix A: Using LMTV with Synopsy
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Appendix B: Using Custom Memory Mod
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Simulator Configuration Guide for Synopsys Models

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