science

Language for Instruction Set Architecture

Language for Instruction Set Architecture is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Language for Instruction Set Architecture rather than just read about it. In short: LISA (Language for Instruction Set Architectures) is a language to describe the instruction set architecture of a processor. LISA captures the information required to generate software tools (compiler, assembler, instruction set simulator, ...) and implementation hardware (in VHDL or Verilog) of a given processor.

Key takeaways

Language for Instruction Set Architecture belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Language for Instruction Set Architecture to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Language for Instruction Set Architecture from memory before moving on to harder problems.

Reference excerpt

LISA (Language for Instruction Set Architectures) is a language to describe the instruction set architecture of a processor. LISA captures the information required to generate software tools (compiler, assembler, instruction set simulator, ...) and implementation hardware (in VHDL or Verilog) of a given processor. LISA has been used to re-implement the hardware of existing processor cores, keeping the binary compatibility with the legacy version, as all software tools did already exist and legacy compiled software images could be executed on the newly created hardware. Another application has been to generate the ISS (instruction set simulator) for RISC processors such the ARM architecture ISSes. LISA' is not focused on the modeling of other on-chip components around the processor core itself, such as peripherals, hardware accelerators, buses and memories; Other languages such as SystemC can be used for these. The language has not been yet standardised by IEEE or ISO and is currently owned by RWTH Aachen University, in Germany.

History LISA was initially developed at Institute for Integrated Signal Processing Systems (ISS) Aachen, belonging to RWTH Aachen University, in Germany. The current official version from RWTH Aachen is LISA 2.0. The language is still in evolution to cover research on processors, including Reconfigurable computing (in LISA 3.0), multi-core, parallel programming. One noticeable branch called LISA+ has been created for handling the modeling of peripherals such as interrupt controllers, timers, etc.

See also Alphabetical list of programming languages SystemC Verilog VHDL

References

Papers V. Zivojnovic, S. Pees, Ch. Schläger, H. Meyr, LISA bridges gaps in high-tech languages, Electronic Engineering Times, Oct 7, 1996 [2] V. Zivojnovic, S. Pees, H. Meyr, LISA – machine description language and generic machine model for HW/SW co-design, Proceedings of the IEEE Workshop on VLSI Signal Processing (San Francisco), Oct. 1996 A. Chattopadhyay, H. Meyr and R. Leupers: LISA: A Uniform ADL for Embedded Processor Modeling, Implementation and Software Toolsuite Generation appearing in P. Mishra, N. Dutt, Processor Description Languages, Volume 1, Morgan Kaufmann, 2008. ISBN 978-0123742872

Books A. Hoffmann, H. Meyr, R. Leupers: Architecture Exploration for Embedded Processors with LISA, Springer, 2010. ISBN 978-1441953346 O. Wahlen: C Compiler Aided Design of Application-specific Instruction-set Processors Using the Machine Description Language LISA (Berichte Aus Der Electrotechnik), Shaker Verlag GmbH, Germany (August 13, 2004). ISBN 3-8322-3035-1

External links LISA project page at RWTH Aachen, Germany Processor Designer is a tool sold by Synopsys to create processors from LISA 2.0 descriptions

Worked examples

Example 1 — a first encounter with Language for Instruction Set Architecture

Start with the simplest possible case. Write down what Language for Instruction Set Architecture claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Language for Instruction Set Architecture before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Language for Instruction Set Architecture ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Language for Instruction Set Architecture

In research: Language for Instruction Set Architecture appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Language for Instruction Set Architecture in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Language for Instruction Set Architecture is common in secondary-school and first-year university syllabi. It links to neighbouring topics Specification languages, so understanding it makes those chapters shorter.
In everyday life: Look for Language for Instruction Set Architecture outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Language for Instruction Set Architecture in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Language for Instruction Set Architecture means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Language for Instruction Set Architecture out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Language for Instruction Set Architecture in simple terms?

Why does Language for Instruction Set Architecture matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Language for Instruction Set Architecture?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Language for Instruction Set Architecture.