The two biggest challenges of today’s complex design are IP-Integration and Verification, and we would like to address solution scoping the discussion to the register implementation which is the core competency of Agnisys. A few years back with the rise of the ecosystem of multiple IP providers, there was a great need to describe the IP using a standard format to maintain the consistency of the information.
The goals of the IP-XACT standard are:
IP-XACT standard is followed by leading companies for defining and describing: components, systems, bus interfaces and connections, abstractions of those buses, and details of the components including address maps, register and field descriptions, and file set descriptions for use in automating design, verification, documentation, and use flows for electronic systems. A set of XML schemas of the form described by the World Wide Web Consortium (w3c) and a set of semantic consistency rules (SCRs) are included. A generator interface that is portable across tool environments is provided. The specified combination of methodology-independent meta-data and the tool-independent mechanism for accessing that data provides for the portability of design data, design methodologies, and environment implementations.
Focusing on Register: As we know implementing registers is not difficult but it is a monotonous task as often changes are introduced late in the design cycle which creates issues such as – Register location ambiguity, Register type definition, Register definition/bit fields, Register implementation. The core philosophy of using single-source files for implementing registers is to use a correct construction approach with the added advantage of reusing existing data.
IDesignSpec beautifully complements the completeness of IP-XACT to capture the register information and generate the verified implementation in various formats such as Synthesizable RTL, Synthesizable SystemVerilog, UVM Register Model and verification environment, C/C++ header files, documentation, and for reusing register details SystemRDL, and XML files. The uniqueness of IDesignSpec is to use a single source file to generate integrated outputs, which reduces the risk of ambiguous functionality.
IP-XACT code generated by IDesignSpec –
<spirit:component xmlns:ids="https://www.agnisys.com/"
xmlns:spirit="http://www.spiritconsortium.org/XMLSchema/SPIRIT/1685-2009"
xmlns:xrsl="https://www.agnisys.com/">
<spirit:vendor>Agnisys_Inc.</spirit:vendor>
<spirit:library>Agnisys_Inc.</spirit:library>
<spirit:name>RGU_csv_model</spirit:name>
<spirit:version>1.0</spirit:version>
<spirit:memoryMaps>
<!--//chip:RGU_csv-->
<spirit:memoryMap>
<spirit:name>RGU_csv</spirit:name>
<spirit:addressBlock>
<spirit:name>ambaAPB</spirit:name>
<spirit:description/>
<!-- // block : ambaAPB -->
<spirit:baseAddress>0x00</spirit:baseAddress>
<spirit:range>72</spirit:range>
<spirit:width>32</spirit:width>
<spirit:register>
<spirit:name>reset0Delay</spirit:name>
<spirit:description>"Delay value for reset 0</spirit:description>
<spirit:addressOffset>0x0</spirit:addressOffset>
<spirit:size>32</spirit:size>
<spirit:volatile>false</spirit:volatile>
<spirit:reset>
Agnisys works with a variety of customers and we come across use cases that are beyond the scope of IP-XACT. Fortunately, we can still describe beyond the special features in IP-XACT using Vendor Extensions (VE). Features like Alias, Interrupt, counter, Paged, trigger buffer register, custom connection, UVM properties, etc. have been implemented using VE.
IDesignSpec Key Benefits with IP-XACT – Improves Design Team Performance
IDesignSpec Availability: IDesignSpec is available as a plug-in for popular editors that are commonly used to document registers (Microsoft Word, Microsoft Excel and LibreOffice) and as a command line utility for Windows, Linux, and MAC platforms.
Ref- https://en.wikipedia.org/wiki/IP-XACT
http://accellera.org/activities/working-groups/ip-xact/