- •Contents
- •Preface
- •Related Documents
- •Typographic and Syntax Conventions
- •Creating HDL Modules for CDBA Cellviews
- •Creating HDL Data as You Save CDBA Cellviews
- •Creating HDL Data from Pre-existing CDBA Cellviews
- •Quick-Start Tutorial
- •The Circuit
- •AMS Designer Tools
- •Setting Up the Tutorial
- •Running from a Script
- •Running within the AMS Environment
- •Opening the Command Interpreter Window
- •Netlisting and Compiling
- •Elaborating and Simulating the Design
- •Summary
- •Setting Up the AMS Environment
- •Overview
- •The hdl.var File
- •The ams.env Files
- •AMS Designer Supports Design Management
- •Specifying the Text Editor to Use
- •Specifying Fonts for the Cadence Hierarchy Editor
- •Preparing to Use AMS Designer from the Hierarchy Editor
- •Netlisting
- •Netlisting Modes Supported by the AMS Netlister
- •Automatic Netlisting of a Cellview
- •Netlist Updating and Netlisting of Entire Designs
- •Netlisting from the UNIX Command Line
- •Library Netlisting
- •Netlisting of Cells in Response to Changes in CDF
- •Preparing Existing Analog Primitive Libraries for Netlisting
- •Specifying the Behavior of the Netlister and Compilers
- •Opening the AMS Options Windows
- •Setting Netlister Options from the Hierarchy Editor
- •Opening the CIW AMS Options Window
- •Setting Compiler Options
- •Viewing the AMS Netlister Log
- •Understanding the Output from the AMS Netlister
- •How Inherited Connections Are Netlisted
- •Inherited Signal Connections
- •Inherited Terminal Connections
- •Instance Values for Inherited Connections
- •Third-Party Tools and Other Cadence Tools
- •How Aliased Signals Are Netlisted
- •How m-factors (Multiplicity Factors) Are Netlisted
- •How Iterated Instances Are Netlisted
- •Passing Model Names as Parameters
- •Effect of the modelname, model, and modelName Parameters
- •Handling of the model* and componentName Parameters
- •Precedence of the model* and componentName Parameters
- •Specifying Parameters to be Excluded from Netlisting
- •Ignoring Parameters for Entire Libraries
- •Example: Specifying Parameters to Ignore
- •Ensuring that Floating Point Parameters Netlist Correctly
- •Working with Schematic Designs
- •Setting Schematic Rules Checker Options for AMS Designer
- •Creating Cellviews Using the AMS Environment
- •Preparing a Library
- •Creating the Symbol View
- •Using Blocks
- •Descend Edit
- •Inherited Connections
- •Global Signals in the Schematic Editor
- •Inherited Connections in a Hierarchy
- •How Net Expressions Evaluate
- •Net and Pin Properties
- •groundSensitivity and supplySensitivity Properties
- •Making Connect Modules Sensitive to Inherited Connection Values
- •Using External Text Designs
- •Overview of Steps for Using External Text Designs
- •Bringing Modules into a Cadence Library
- •Specifying the Working Library
- •Compiling into Libraries
- •Compiling into Temporary Libraries
- •Listing Compiled Modules
- •Using Text Blocks in Schematics
- •Using Modules Located in a Cadence Library
- •Preparing for Simulation
- •Using Analog Primitives
- •Using SPICE and Spectre Netlists and Subcircuits
- •Preparing to Use SPICE and Spectre Netlists and Subcircuits
- •Placing SPICE and Spectre Netlists and Subcircuits in a Schematic
- •Using Test Fixtures
- •Creating and Using a Textual Test Fixture
- •Creating a Textual Test Fixture
- •Using a Test Fixture
- •Example: Creating and Using a Test Fixture
- •Using Design Configurations
- •Ensuring HDL Design Unit Information Is Current
- •Preparing a Design for Simulation
- •Overview of AMS Design Prep
- •What AMS Design Prep Does to Prepare a Design for Simulation
- •When to Use AMS Design Prep
- •Specifying the Behavior of AMS Design Prep
- •Setting Options for Global Design Data
- •Specifying Global Signals
- •Specifying Design Variables
- •Specifying Model Files to Use During Elaboration
- •Running AMS Design Prep
- •The cds_globals Module
- •Global Signals
- •Design Variables
- •Setting Elaborator Options
- •Setting Simulator Options
- •Setting Waveform Selection Options
- •Creating Probes
- •Selecting Instances from the Virtuoso Schematic Editing Window
- •Selecting Buses
- •Selecting Instances from the Scope Navigator
- •Copying and Pasting Within Tables
- •Elaborating and Simulating
- •Viewing Messages
- •Plotting Waveforms After Simulation Ends
- •Starting the SimVision Waveform Viewer
- •Plotting Waveforms Selected on a Schematic (Direct Plot)
- •Using the amsdesigner Command
- •Examples
- •Producing Customized Netlists
- •Producing Customized Netlists
- •Identifying the Sections of a Netlist
- •Using ams.env Variables to Customize Netlists
- •Using Netlisting Procedures to Customize Netlists
- •Examples: Problems Addressed by Customized Netlists
- •Example: Adjusting Parameter Values to Account for Number of Fingers
- •Example: Using Symbols that Represent Verilog Test Code
- •Data Objects Supported for Netlisting
- •Netlister Object
- •Formatter Object
- •Cellview Object
- •Parameter Object
- •Instance Object
- •SKILL Functions Supported for Netlisting
- •Default Netlisting Procedures
- •Netlisting Helper Functions
- •Variables for ams.env Files
- •How AMS Designer Determines the Set of Variables
- •Why AMS Designer Uses ams.env Files, Not .cdsenv Files
- •List of ams.env Variables
- •Detailed Descriptions of ams.env Variables
- •aliasInstFormat
- •allowDeviantBuses
- •allowNameCollisions
- •allowSparseBuses
- •allowUndefParams
- •amsCompMode
- •amsDefinitionViews
- •amsEligibleViewTypes
- •amsExcludeParams
- •amsExpScalingFactor
- •amsLSB_MSB
- •amsMaxErrors
- •amsScalarInstances
- •amsVerbose
- •analogControlFile
- •bindCdsAliasLib
- •bindCdsAliasView
- •cdsGlobalsLib
- •cdsGlobalsView
- •checkAndNetlist
- •checkOnly
- •checktasks
- •compileAsAMS
- •compileExcludeLibs
- •compileMode
- •connectRulesCell
- •connectRulesCell2
- •connectRulesLib
- •connectRulesView
- •detailedDisciplineRes
- •discipline
- •excludeViewNames
- •hdlVarFile
- •headerText
- •ieee1364
- •ifdefLanguageExtensions
- •incdir
- •includeFiles
- •includeInstCdfParams
- •initFile
- •instClashFormat
- •iterInstExpFormat
- •language
- •lexpragma
- •logFileAction
- •logFileName
- •macro
- •maxErrors
- •messages
- •modifyParamScope
- •ncelabAccess
- •ncelabAnnoSimtime
- •ncelabArguments
- •ncelabCoverage
- •ncelabDelayMode
- •ncelabDelayType through ncelabMessages
- •ncelabMixEsc
- •ncelabModelFilePaths
- •ncelabNeverwarn through ncelabVipdelay
- •ncsimArguments
- •ncsimEpulseNoMsg through ncsimExtassertmsg
- •ncsimGUI
- •ncsimLoadvpi through ncsimStatus
- •ncsimTcl
- •ncsimUnbuffered through ncsimUseAddArgs
- •ncvhdlArguments
- •ncvlogArguments
- •ncvlogUseAddArgs
- •netClashFormat
- •netlistAfterCdfChange
- •netlistMode
- •netlistUDFAsMacro
- •neverwarn
- •noline
- •nomempack
- •nopragmawarn
- •nostdout
- •nowarn
- •paramDefVals
- •paramGlobalDefVal
- •pragma
- •processViewNames
- •prohibitCompile
- •runNcelab
- •runNcsim
- •scaddlglblopts
- •scaddltranopts
- •scale
- •scalem
- •scannotate
- •scapprox
- •scaudit
- •sccheckstmt
- •sccmin
- •sccompatible
- •scdebug
- •scdiagnose
- •scdigits
- •scerror
- •scerrpreset
- •scfastbreak
- •scgmin
- •scgmincheck
- •schomotopy
- •sciabstol
- •scic
- •scicstmt
- •scignshorts
- •scinfo
- •scinventory
- •sclimit
- •sclteratio
- •scmacromod
- •scmaxiters
- •scmaxnotes
- •scmaxrsd
- •scmaxstep
- •scmaxwarn
- •scmethod
- •scmodelevaltype
- •scmosvres
- •scnarrate
- •scnotation
- •scnote
- •scopptcheck
- •scpivabs
- •scpivotdc
- •scpivrel
- •scquantities
- •screadic
- •screadns
- •screlref
- •screltol
- •scrforce
- •scscale
- •scscalem
- •scscftimestamp
- •scscfusefileflag
- •scskipcount
- •scskipdc
- •scskipstart
- •scskipstop
- •scspeed
- •scstats
- •scstep
- •scstop
- •scstrobedelay
- •scstrobeperiod
- •sctemp
- •sctempeffects
- •sctitle
- •sctnom
- •sctopcheck
- •sctransave
- •scusemodeleval
- •scvabstol
- •scwarn
- •scwrite
- •simRunDirLoc
- •simVisScriptFile
- •status
- •templateFile
- •templateScript
- •timescale
- •update
- •use5xForVHDL
- •useDefparam
- •useNcelabNowarn
- •useNcelabSdfCmdFile
- •useNcsimNowarn
- •useNowarn
- •useScaddlglblopts
- •useScaddltranopts
- •useScic
- •useScreadic
- •useScreadns
- •useScwrite
- •useSimVisScriptFile
- •useProcessViewNamesOnly
- •verboseUpdate
- •vlogGroundSigs
- •vloglinedebug
- •vlogSupply0Sigs
- •vlogSupply1Sigs
- •wfDefaultDatabase
- •wfDefInstCSaveAll
- •wfDefInstCSaveLvl
- •wfDefInstSaveCurrents
- •wfDefInstSaveVoltages
- •wfDefInstVSaveAll
- •wfDefInstVSaveLvl
- •wfDefInstVSaveObjects
- •Updating Legacy SimInfo for Analog Primitives
- •The ams Fields
- •Special Handling of model, modelName, modelname, and componentName
- •Converting an Existing Analog Primitive Library
- •Designing for Virtuoso AMS Compliance
- •Terminals
- •Buses
- •Component Description Format
- •Parameters
- •Using Inherited Parameters
- •Using Cell Parameters
- •Parameterized Cells
- •VHDL-AMS Component Declarations
- •Properties
- •Properties to Avoid Completely
- •Avoid the portOrder Property Unless Required by Special Circumstances
- •Properties to Use Only in AMS Compatibility Mode
- •Properties That Have No Special Meaning in the AMS Environment
- •Properties Fully Supported by the AMS Environment
- •SKILL Functions
- •amsCheckCV
- •amsIsPresent
- •amsNetlist
- •amsProcessCellViews
- •amsUIOptionsForm
- •amsUIRunNetlisterForm
- •ddsCvtAMSTranslateCell
- •ddsCvtAMSTranslateLib
- •ddsCvtToolBoxAMS
- •vmsUpdateCellViews
- •Customization Variables
- •schHdlNotCreateDB
- •schHdlUseVamsForVerilog
- •vmsAnalysisType
- •vmsCreateMissingMasters
- •vmsNcvlogExecutable
- •vmsPortProcessing
- •vmsRunningInUI
- •vmsTemplateScript
- •vmsVerboseMsgLevel
- •Compiling Cadence-Provided Libraries
- •Purpose of the amsLibCompile Tool
- •Running the amsLibCompile Tool Manually
- •Example
Virtuoso AMS Environment User Guide
Variables for ams.env Files
amsEligibleViewTypes
Specifies the cellview types that trigger netlisting.
Syntax
amsDirect.vlog amsEligibleViewTypes string "list"
Values |
|
list |
A list of one or more of the following cellview types: schematic, |
|
symbolic, maskLayout (extracted view only, based on the last |
|
extraction timestamp), and netlist. Cellview types must be |
|
separated by spaces in the list. If you do not specify a cellview |
|
for netlisting (by using the amsdirect -VIew option, for |
|
example), the AMS netlister generates netlists for each of the |
|
cellview types included in the list. The default for list is |
|
schematic. |
Example
amsDirect.vlog amsEligibleViewTypes string "schematic symbolic"
Tells the AMS netlister to netlist schematic and symbolic cellviews (unless, for example, a view is specified by using theamsdirect -VIew option). This example sets the netlisting behavior for data netlisted into the Verilog-AMS language.
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Variables for ams.env Files
amsExcludeParams
Lists parameters to be omitted from the netlist.
Syntax
amsDirect amsExcludeParams string "list"
Values |
|
list |
A list of parameters that are not to be netlisted. list is a string |
|
of space-separated parameter names. The default is an empty |
|
string. |
Example
amsDirect amsExcludeParams string "fix unfix"
Tells the AMS netlister not to netlist the parameters fix and unfix when they are found associated with components in this design.
Note that if a cell has valid information in the ams section of the CDF simInfo, the contents of the simInfo are always obeyed, regardless of the value of the amsExcludeParams variable. For example, for a cell mycell, if param1 and param2 are in the instParameters field of the simInfo and param1 is also listed in the amsExcludeParams variable, then amsExcludeParams has no effect. When mycell (or any instance of mycell) is netlisted, param1 is always printed.
You can use the excludeParameters simInfo field in conjunction with the amsExcludeParams ams.env variable and the amsExcludeParams CDF parameter to precisely specify parameters at the cell, design, and library levels that are not to be netlisted. For more information, see “Specifying arametersP to be Excluded from Netlisting” on
page 137.
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Variables for ams.env Files
amsExpScalingFactor
Controls the expansion of scaling factors for parameter values.
Syntax
amsDirect amsExpScalingFactor cyclic "no" | "dec" | "sci"
Values |
|
no |
Includes scaling factor suffixes in netlists without expanding |
|
them. This is the default. |
dec |
Expands scaling factor suffixes in decimal notation. |
sci |
Expands scaling factor suffixes in scientific notation. |
Description
Some simulators do not support scaling factors or support only a subset of the scaling factors used in designs. If the simulator you plan to use is one of these simulators, you can use the amsExpScalingFactor variable to expand scaling factors so the factors do not appear in netlists.
For example, Verilog-XL does not support scaling factor suffixes. If you intend to use Verilog-XL, you can use this variable so the AMS netlister expands suffixes when it generates netlists.
The following table shows the scaling factor suffixes and the target simulators that support them.
Scaling Factor Suffixes and Target Simulators
Suffix |
|
Scaling |
AEL |
Verilog-AMS |
Spectre |
SKILL |
cdsSpice |
|
Factor (ex) |
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Y |
Yotta |
1024 |
See note below. |
|
|
|
|
Z |
Zetta |
1021 |
See note below. |
|
|
|
|
T |
Tera |
1012 |
yes |
yes |
yes |
yes |
yes |
G |
Giga |
109 |
yes |
yes |
yes |
yes |
yes |
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Variables for ams.env Files
Scaling Factor Suffixes and Target Simulators, continued
Suffix |
|
Scaling |
AEL |
Verilog-AMS |
Spectre |
SKILL |
cdsSpice |
|
Factor (ex) |
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
M |
Mega |
106 |
yes |
yes |
yes |
yes |
yes |
ME |
Mega |
106 |
yes |
|
|
yes |
yes |
K |
Kilo |
103 |
yes |
yes |
yes |
yes |
yes |
k |
kilo |
103 |
yes |
|
yes |
yes |
yes |
% |
percent |
10-2 |
yes |
|
yes |
yes |
|
c |
percent |
10-2 |
|
|
yes |
|
|
m |
milli |
10-3 |
yes |
yes |
yes |
yes |
yes |
u |
micro |
10-6 |
yes |
yes |
yes |
yes |
yes |
n |
nano |
10-9 |
yes |
yes |
yes |
yes |
yes |
p |
pico |
10-12 |
yes |
yes |
yes |
yes |
yes |
f |
femto |
10-15 |
yes |
yes |
yes |
yes |
yes |
a |
atto |
10-18 |
yes |
yes |
yes |
yes |
yes |
z |
zepto |
10-21 |
See note below. |
|
|
|
|
y |
yocto |
10-24 |
See note below. |
|
|
|
|
Note: AMS Designer always expands the Y, Z, z, and y scaling factors, using scientific notation, regardless of the value of the amsExpScalingFactor variable.
Example
A few examples of expanded scaling factor suffixes are shown below.
5.46T = 5.46e12 = 5,460,000,000,000
5.46G = 5.46e9 = 5,460,000,000
5.46M = 5.46e6 = 5,460,000
5.46K = 5.46e3 = 5,460
5.46% = 5.46e-2 = 0.0546
5.46u = 5.46e-6 = 0.00000546
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