Transaction-level modeling: Difference between revisions

Revision as of 22:38, 19 May 2022

Revision as of 06:44, 20 May 2022

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{{Short description|Approach for digital systems design}}

'''Transaction-level modeling''' ('''TLM''') is an approach to modelling complex digital systems asby part ofusing [[electronic design automation]] software.<ref name="TVLSIHB-2007">{{Cite book |url=https://www.worldcat.org/oclc/70699056 |title=The VLSI handbook |date=2007 |publisher=CRC/Taylor & Francis |others=Wai-Kai Chen |isbn=978-0-8493-4199-1 |edition=2 |___location=Boca Raton, FL |oclc=70699056}}</ref>{{Rp|page=1955}} TLM language (TLML) is a [[hardware description language]], usually, written in C++ and based on [[SystemC]] library.<ref name="TVLSIHB-2007" /> TLMLs are used for modelling where details of communication among modules are separated from the details of the implementation of functional units or of the communication architecture. It's used for modelling of systems that involve complex data communication mechanisms.{{r|TVLSIHB-2007|pp=1955}}

Components such as buses or [[FIFO (computing and electronics)|FIFOs]] are modeled as channels, and are presented to modules using [[SystemC]] interface classes. Transaction requests take place by calling interface functions of these channel models, which encapsulate low-level details of the information exchange. At the transaction level, the emphasis is more on the functionality of the data transfers – what data are transferred to and from what locations – and less on their actual implementation, that is, on the actual protocol used for data transfer. This approach makes it easier for the system-level designer to experiment, for example, with different bus architectures (all supporting a common abstract interface) without having to recode models that interact with any of the buses, provided these models interact with the bus through the common interface.<ref>T. Grötker, S. Liao, G. Martin, S. Swan, System Design with SystemC. Springer, 2002, Chapter 8., pp. 131. {{ISBN|1-4020-7072-1}} (quoted with permission)</ref>

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However, the application of transaction-level modeling is not specific to the SystemC language and can be used with other languages. The concept of TLM first appears in system level language and modeling ___domain.<ref>L. Cai, D. Gajski, Transaction Level Modeling: An Overview, in proceedings of the Int. Conference on HW/SW Codesign and System Synthesis (CODES-ISSS), Oct. 2003, pp. 19–24</ref>

Ttransaction-level models are used for [[high-level synthesis]] of [[register-transfer level]] (RTL) models for a lower-level modelling and implementation of system components. RTL is usually represented by usinga [[hardware description language]] source code (e.g. [[VHDL]], [[SystemC]], [[Verilog]]).{{r|TVLSIHB-2007|pp=1955-1957}}

==History==