OpenPDK Symbol, CDF, and Callback Working Group · 2011-06-28 · Silicon Integration Initiative...

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Innovation Through Collaboration

OpenPDK Symbol, CDF, and Callback Working Group

Rich MorseMarketing & EDA Alliances Mgr.

SpringSoft

June 6, 2011

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Overview

• The SCC working group is focused on developing specifications for standard symbol set; parameter definition; simulation and verification interface; and parameter checking and relationships (callbacks).

• Includes members from Cadence, IBM, Intel, Mentor, National Semiconductor, Springsoft, ST, and Synopsys.

• In January, the working group divided into 4 sub-groups to focus on spec development.

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Leadership

• Chairman - Barry Nelson, Cadence• Symbols – Rich Morse, SpringSoft• Parameters - Li-Chien Ting, Cadence• Simulation – Kristin Liu, National Semiconductor• Callbacks – Ted Paone, Cadence

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SYMBOLS

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Symbols Working Group

• Objectives– Create a method and specification whereby symbols

can be portable among EDA tools, design databases and technologies

• Symbol elements will appear and function the same in all tools when the specification is followed (i.e. Symbol graphic, pin locations, origin, symbol boundary)

– Use OA symbols as the reference implementation• Expand the existing symbol library

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Taking Inventory

• 63 existing symbols in the Si2 library

– Retain legacy library

• 23 source symbols donated by SpringSoft

• Planned ESD symbol donation from IBM

• Symbol donation from (your name here)

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Flow

Initial assumption:

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YAML, XML or EDIF

Description

OA Reference Library

Specification

Non‐OA Library

Non‐OA Library

Non‐OA Library

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Flow

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YAMLDescription

YAML

SVG

HTM

L

Generation Scripts

OA Reference Library

Non‐OA Library

Non‐OA Library

Non‐OA Library

Existing OA Library

+ Contributions

Specification

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YAML

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- shape: "rect"layer: "instance"purpose: "drawing"box: [0.000000, -0.187500, 0.250000, 0.187500]

- shape: "rect"layer: "pin"

- shape: "evalText"layer: "annotate"purpose: "drawing8"expression: "cdsTerm(\"S\")"origin: [0.218750, -0.181250]alignment: "lowerRight"orient: "R0"font: "stick"height: 0.050000overbar: falsevisible: truedrafting: true………

YAML:Human readableConcise Easy to defineXML‐based

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SVG Reference Graphics

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• Generated automatically from OA Symbols

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HTML

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Center of pinsInstance boundary

Symbol origin

• Symbol drawings are well known & don’t need further standardization

• Interoperability and portability depend on 3 basic elements: Pin locations, symbol origin & instance bounding box

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What Remains to Be Done

• Write the specification document

– Accumulate the generated data

– Describe the basic rules

• Solicit more donations to increase the library

• Test symbol generation in a non-OA

environment

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PARAMETERS

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Parameter Working Group

• Objectives– Standardize parameter data organization and

inheritance– Standardize parameter description attributes – Standardize parameter UI attributes– Using YAML as a language for parameter description

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Component Description Format (CDF)

• Container for parameters, callbacks and simulation interface information

• Can be specified at different design data levels

• Defined precedence order produces “effective CDF”

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CDF Container

• CDF container refers to the full specification of a CDF at the library or cell level

• It contains specification for– Data callback for init and done– UI field sizes– Parameter and callback– Simulation interface– Parameter mapping– User property

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Parameter Definition• Key attributes of a parameter

– name– type

• “int”, “float”, “string”, “boolean”, “net-set”, “user”– default– value– choices

• Discrete set of possible values for the given type– parse-as

• Built in parser for “number”, “float”, “int”, “point list”, “layer-purpose-list”

• Custom parser for “user” type parameter– store-default– dont-save– use

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Parameter UI Attributes

• Parameter attributes for a UI based environment– prompt– unit

• “resistance”, “capacitance”, “inductance”, “conductance”, “time”, “frequency”, “power”, “power-DB”, “length-metric”, “length-English”, “angle”, “voltage”, “current”, “temperature”, “area-metric”, “area-English”

– ui-type• “int”, “float”, ”string”, “toggle”, “radio”, “cyclic”, “button”

– editable– display

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YAML Example

cdf-parameters:

- name: modelprompt: "Device Model"type: stringdefault: "NMOS"display: falseeditable: false

- name: wprompt: "Channel Width"type: stringdefault: "1.00u"units: lengthmin: "0.35u"max: "10.00u"display: trueeditable: truecallback: "MOS_Validate()“

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netlisting:

mynetlister1:prop-map: {w: weff}term-map: {src: s, drn: d, gte: g, blk: b}term-order: [g, d, s, b]

mynetlister2:prefix: "M"term-map: {src: S, drn: D, gte: G, blk: B}term-order: [d, g, s, b]

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SIMULATION

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Simulation Information Working Group

• Objectives– Provide flexible and consistent mechanism to transfer

device properties to netlist– Standardize simulation information attributes– Use textual description for simulation information– Simplify user netlist procedure creation and

evaluation– Allow callbacks to manipulate simulation information

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Simulation Information Definition

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• Simulation information contained in CDF• Represents the device parameters and properties • Set determined by the target EDA simulation

netlister• Defined by the master CDF

• Information can be specified and stored at different design data levels

• Information executed with “effective” CDF• Information attributes to be standardized in the

oPDK standard

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Simulation Information Content

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OPDK Standard

Simulation Information<netlistProcedure><terminalOrder><namePrefix><terminalMapping><parameterList><propertyMapping><parameterExpressionList><>

Simulation Information<netlistProcedure><terminalOrder><namePrefix><terminalMapping><parameterList><propertyMapping><parameterExpressionList><>

Simulation Information<netlist procedure><terminal order><name prefix><terminal mapping><parameter list><property mapping><parameter expression list><……>

• Standardized simulation information attributes and arguments

Device netlist

Device netlist

Device netlist

Key attributes Translation

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Simulation Information Attributes• Support user customized netlist procedures with

standardized arguments• Based on the CDF callbacks

– Allow dynamic parameter list witho Default parameter listo Inclusive parameter listo Exclusive parameter list

– Change component name usingo Default component nameo Model name of different geometry or device structure type

– Able to re-order terminals to indicate device structure byo Default terminal ordero “Short” to remove the instance in the netlisto “Open” to assume a high impedance between the terminalso Customized with “list of paired terminals” for this action

– Standardized syntax of terminal mapping and parameter expression list

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YAML

Simulation Information Syntax

• Textual description for simulation information - YAML

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Parameter

Property

View Information

Simulation Information

Simulation Information Input Files

Simulation Information<netlist procedure><terminal order><name prefix><terminal mapping><parameter list><property mapping><parameter expression list><……>

simulator: tool1procedure: noneparam-list:[w l finger m]term-order: [D G S B]prop-map: {w: weff}

simulator: tool2procedure: noneparam-list:[w l finger m]term-order: [D G S B]name-prefix: “X”

simulator: tool3procedure: noneparam-list:[w l finger m]term-order: [D G S B]term-map:

{D:d,G:g,S:s,B:b}

simulator: tool4procedure: lvsProcparam-list:[w l finger m]term-order: [D G S B]callbacl: “mosCB”

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CALLBACKS

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Callback Working Group

• Objectives– Create a method and specification so that a single

callback description can be portable among EDA tools, and design databases

– Extend the current callback mechanism to meet the needs of 21st century design requirements

– Support for interactive and non-interactive callback evaluation

– Simplify callback creation by specifying standard automatic callbacks for common data validation

– Standardize user callback creation and evaluation– Provide robust error handling

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Callback Evaluation

• Wide range of callback capabilities– Modify values and attributes of parameters– Updates to simulation interface information

• Callbacks evaluated on parameter value change– Not tied to interactive editor form– Order control for non-interactive operation

• User control for callback evaluation– Attributes control automatic and user callbacks

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Automatic Validation Callbacks

• Standardized data validation– Minimize need for user create callbacks– Check entered data against constraints– Constraints assigned as parameter attributes– Inclusive or exclusive checks

• min• max• range• grid snapping

– grid offset

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Support for User Callbacks

• Standardized callback arguments• Example API support for CDF access*

– Get/set parameters and values– Access attributes

• Consistent error handling– On a CDF– On individual parameters

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*API’s are for exploratory purposes and are not part of the standard

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User Controlled Error Resolution

Reset value

Value entered

Autodata

validation

Usererror

handler?END

Usererror

handler

Error detected?

DataOK?

Userdata

callbackReset value END

Continue

No

No

No

Yes

Yes

Value entered

Autodata

validation

Usererror

handler

DataOK?

Userdata

callback

Reset value

ENDContinue

Errorinvoked

No

Yes

Consistent error handlingAutomatic validation User callbacks

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THANK YOU!

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OpenPDK Symbol, CDF, and Callback Working Group · 2011-06-28 · Silicon Integration Initiative...

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Transcript of OpenPDK Symbol, CDF, and Callback Working Group · 2011-06-28 · Silicon Integration Initiative...