OpenPDK Coalition. Open Process Specification Working Group Status
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1 OpenPDK Coalition Open Process Specification Working Group Status Gilles NAMUR OPDKC TSG Chair June 6 th, 2011
2 PDK Development Flow Ecosystem Foundry 2 Foundry 1 Foundry 3 Set of PDK Inputs: DRM & Device Spec (Format B) Set of PDK Inputs: DRM & Device Spec (Format A) Set of PDK Inputs: DRM & Device Spec (Format C) PDK Development Team Device Library Spices LVS Several PDK Input formats Several PDK Generation flows Several EDA Tools for the same feature to be supported DRC PEX Customer A Design & Validation With Tool Suite A Customer B Design & Validation With Tool Suite B Customer C Design & Validation With Tool Suite C
3 OPS : a standardized PDK inputs format Foundry 1 Foundry 2 Foundry 3 OPS.xml <Process> <Libraries> <Devices> <Layers> <Rules> Customer A Design & Validation With Tool Suite A Customer B Design & Validation With Tool Suite B Customer C Design & Validation With Tool Suite C SI2 Open PDK Coalition Open Process Specification Working Group aims to produce a standard for exchanging all data needed to generate a PDK. Open Process Specification (OPS) is the given name to the Standard Document (XSD format), used as syntax template. This standardized PDK Input format will enable a single and automated PDK generation flow. 3
4 OPS versus Design Manual OPS is then a subset of the Design Manual with additional information for PDK Devices. The OPS is a XML file that could be generated from any Structured Design Manual DB. OPS XSD Device Specifications OPS.xml <Process> <Libraries> <Devices> <Layers> <Rules> 14-Jun-11 4
5 OPS Working Group: Working Model OPS UML diagram (OPS.umldi) is a graphical representation of OPS UML (OPS.uml) Helps to define OPS.xsd <Process> <Libraries> <Devices> <Layers> <Rules> OPS XML schema (.xsd) Specification For all PDK exchange data Sets a syntax for edrm.xml <Process> <Devices> <Layers> <Rules> edevice.xml <Process> <Devices> <Layers> <Rules> XML input files OPS.xml Instance Data For particular PDK UML is a global standard for graphically representing concept, objects, relationships An unambiguous vocabulary for expressing the semantics of domain information Optimal vehicle for enabling discussion among PDK engineers from different backgrounds XSD is (not automatically) derived from a UML, and specifies an XML syntax. PDK input files such as edrm.xml (same data as DRM.pdf) must be compliant with this syntax. 6/14/2011 5
6 Current OPS UML Representation
7 Status on the OPS Progress First OPS (UML representation) Contribution from ST in 2010 Device, Library, Layers & Design Rules objects have been discussed and updated now considered as stable Documentation through Eclipse-Topcased in the UML description is ongoing. Very usefull to provide explanation and xml example implementation. Will ease the XSD generation. Definition of the opendfm templates in the OPS on going / see next slide CDF, device param, callback, symbol view objects will be updated following SCC WG results PEX objects to be defined with OPEX WG LVS Object need to be defined. ST contributed to SI2 OPDKC with a fake DRM 45nm (PDF + XSD + XML) that will be used as an example in order to generate the associated OPS.xml. OPS Draft XSD 7 OPS Draft XML
8 Standardized High Level techfiles templates Example: DRC metadeck DRCMetaDeck Variable settings nativeverbatim(tool dependantsections) CADlayer DerivedLayer connectic Rule Group A DRCMetadeck is mostly an informative file: - it helps DRC coders to make the link Between their well known usual deck data and their OPS.xml names - Native DRC decks should be built on the fly by CAD vendors in the end, from OPS.xml. Definition: Portability: Interoperability: Such as Grid For tool-specific features List input layers, and derived layers Connect layers when needed Call rule template with related arguments To group rules To be added in UML (then.xsd, then.xml) Already in OPS.xml The OPDK syntax ensures portability among CAD tools. It does not ensure DRC rule templates interoperability. Interoperability depends on : - the reactivity of semiconductor industry/cad vendor community to propose/implement standardized rule - the in-house ability of PDK providers to code their specific rules in different PVT language EDA actors know where to find relevant data in OPS.xml Interoperable data is data that can be interpreted by different EDA tools. OPS.xml enables interoperability.
9 OPDK Generation flow from OPS: DRC example Open PDK Standard OPS.xml <Process> <Libraries> <Devices> <Layers> <Rules> OPS.xsd <Process> <Libraries> <Devices> <Layers> <Rules> Standardized High Level Standardized techfiles High. Level techfiles templates. Ex: MetaDeck for DRC, DFM, LVS, OPEX, CDFs, Call backs... Standardized High Level techfiles. DRCMetaDeck layers(inpulayers) connectic(desciption) nativeverbatim(tool DependantSections) drcrules(call) Syntax checker - odfm templates library (full interoperability) - In-house templates library (more reactive, likely partial interoperability) - xml customization file (custom.xml for coder customization) - GUI customization file (for end user) APIs may be part of the standard DRC / DFM / LVS / Pex tomorrow generation flow?
10 OPS Adopter Kit In order to ease the adoption of OPS as a standard, tools should be developed to automate the OPS.xml generation from an existing PDK. OA techfile & Lib could be easily extracted into an XML file with OPS.xsd format. That tool (DumpOALib2OPS) could be given to SI2 OPDKC as a ST contribution. An OPS Editor (GUI) would also ease the OPS adoption. Template to drive metadecks (for DRC for example) also These tools may be provided as an OPS Adopter Kit with the draft DM & OPS.xml as implementation example. OA Device Library & Techfile OPS.xsd OPS.xml <Process> <Libraries> <Devices> OPS Adopter Kit OPS Draft XML OPS db 10
11 OPS Database, APIs & Editor (GUI) edrm.xml <Process> <Devices> edevice.xml <Layers> <Process> <Rules> <Devices> <Layers> <Rules> XML input files OPS.xml Gui eases OPS.xml updates: - DFM rules edition - Devices edition - edrm.xml <Process> <Devices> edevice.xml <Layers> <Process> <Rules> <Devices> <Layers> <Rules> XML input files OPS.xml Non-xml formats (as YAML) could be supported just by updating Reader/Writer APIs APIs may be part of the standard A GUI is not mandatory, but good for marketing, new comers, and fast updates. In case of Python APIs for example, the db would be virtual. Relations between object instances would be exactly as represented in OPS UML. 11
12 OPS Editor (GUI) How the OPS Editor could look like PO.S.2 DRC rule extracted from OPS.xml : <Rule name="po.s.2 > <Documentation section=' POLY (PO)' table='po Design Rules (POLY)'> <Description>Gate distance to PO in SD (Source/Drain) direction</description> <FootNote/> <Illustration/> </Documentation> <Parameter name="rulevalue" value="0.140" type="float" description="" units="[um]"/> <Parameter name="po.s.2.l1" value="gate" type="layer" description="in_layer1" units=""/> <Parameter name="po.s.2.l2" value="po" type="layer" description="in_layer2" units=""/> <Parameter name="po.s.2.l3" value="sd" type="layer" description="in_layer3" units=""/> <Group name="spacing"> <Group name="po"> <TemplateArguments template="check_space_length"> <Parameter name="-space_less_than" value="rulevalue" type="" description="" units="[um]"/> </TemplateArguments> </Rule> These data are made available in OPS db OPS db can be edited via the GUI Most used parameters are displayed per default, but all can be displayed via See all parameters button Select data Work on a : Rule Device Library Select action Remove Add Edit Edit rule name Documentation section table Description PO.S POLY (PO) From the Group : Density Poly SRAM Active M1 PO Design Rules (POLY) FootNote Illustration Rule : PO.S.1 PO.S.2 PO.W.1 PO.W.2 Gate distance to PO in SD (Source/Drain) direction Parameter Name rulevalue value type FLOAT unit um Group(s) Name Template Arguments Template name enable PO, SPACING check_space_length See all parameters Parameter name space_less_than value rulevalue unit um 12 OK Apply Cancel
13 OPS DEMO Automatic generation of a PDK Device Library from an OPS 6/14/
14 PDK Automation : openlibgen openlibgen is an ST Internal API & Tools. PDK Device Library generation push button flow from an OPS.xml as input. ST internal OPS.xml 1.0 has been frozen in order to develop an automatic Library Generation Flow. Ref Symbols Library Layer List OD Drawing xxx yyy OD pin xxx zzz PO drawing yyy xxx PO drawing yyy zzz Parameter Setup File.. Pcells Library Callbacks Directory Spiltted Techfile Directory SI2 OPS Standard XML file <Process> <Libraries> <Devices> <Layers> <Rules> 14
15 PDK Automation : openlibgen 1/2 openlibgen generation flow: Library creation. Symbols creation from a reference Symbol Library. (copy, rename and rename the pins) Copy the pcells referenced in the OPS from the Pcells Lib. CDF creation & compilation from OPS (no more template, no other input Data) Copy the callbacks referenced in the OPS from the Callbacks directory. Callbacks are then still coded by the Device Library owner. Netlister views Creation from OPS Device Categories Creation from OPS Techfile Creation & compilation: Automate the layer declaration from a layer list Concat the layer declaration with splitted techfile (vias, controls, constraints, functions) these part of the techfile are still developped by the techfile owner. Create all the optional techfiles required. 15
16 Device parameters from paper spec to library Paper specification OPS specification (xml) xml viewer Schematic behavior CDF parameter file
17 Conditional parameter behaviour OPS specification (xml) - source code example Schematic behavior : r change capability linked to calcmode value Paper specification CDF parameter file
18 Callback : from specification to library Paper specification OPS specification (xml) CDF parameter file Procedure in native schematic tool language Library warning message from callback
19 Symbol configuration Paper specification Si2 symbol OPS specification (xml) Resulting symbol
20 Library category settings Paper specification OPS specification (xml) Resulting category structure
21 Netlisting information behaviour Paper specification OPS specification (xml) Spectre netlist generated for the aside mos
22 From techlayer to maptable and display Source file for technology layer description Generated maptable Generated display ressource file Generated sections of techfile
23 openlibgen : Rooms for Improvement Goal : To Reduce as much as possible the PDK Input Data Pcells : Goal is to use OPS in Pcell development Flow. Callbacks : Goal is to replace the hard coded callbacks directory by High Level Description Language templates filled by a flow with Data coming from the OPS. Techfile : Goal is to generate the complete techfile from OPS DATA Pre-developped splitted-techfiles will be removed Callbacks Directory OPS.XML Layer List OD Drawing xxx yyy OD pin xxx zzz PO drawing yyy xxx PO drawing yyy zzz OPS.XML OPS.XML Callback Templates Spiltted Techfile Directory Callbacks for the targeted Library Techfile. 23
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