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Balsa: A Tutorial Guide.pdf

August 9, 2008 · Filed Under Other Open Source  · Tags: ,

Balsa is the name of both the framework for synthesizing asynchronous (clockless) hardware systems and the language for describing such systems. The approach adopted is that of syntax directed compilation into communicating Handshaking Components and closely follows the Tangram system of Philips. The advantage of this approach is that the compilation is transparent: there is a one-to-one mapping between the language constructs in the specification and the intermediate handshake circuits that are produced. It is relatively easy for an experienced user to envisage the architecture of the circuit that results from the original description. Incremental changes made at the language level result in predictable changes at the circuit implementation level. This is important if optimizations and design-tradeoffs are to be made easily at the source level and contrasts with a VHDL description in which small changes in the specification may make radical alterations to the resulting circuit.

Contents:

  • Introduction [ Introducing Balsa ~ Tool set and design flow ~ Changes in releases ]
  • Getting Started [ A single-place buffer ~ Two-place buffers ~ Parallel composition and module reuse ~ Placing multiple structures ~ Using balsa-mgr ~ Simulation ]
  • The Balsa Language [ Data Types ~ Data Typing Issues ~ Control Flow and Commands ~ Binary/Unary Operators ~ Description Structure ~ Examples ]
  • Parameterized & Recursively Defined Circuits [ Summary ~ Parameterised descriptions ~ Recursive definitions ~ Pitfalls with Parameterized Procedures ]
  • Handshake Enclosure [ Summary ~ Systolic counters ~ Active enclosure ~ Use of enclosed channels ]
  • Balsa Design Examples [ Summary ~ A Population Counter ~ A Balsa shifter ~ An Arbiter Tree ~ A Stack Description ~ A Simple Processor - The Manchester SSEM (The Baby) ]
  • Building test harnesses with Balsa [ Overview ~ Summary of Library Functions ~ Writing your own builtin functions ~ Builtin functions with arguments ~ Object Reference Counting ~ Predefined types ~ Example Custom Test Harnesses ]
  • Implementations [ Introduction ~ Creating an implementation ]
  • Adding Technologies to Balsa [ The Balsa backend ~ The technology configuration file ~ Handshake component declarations ~ Handshake component implementation descriptions ~ Adding a new technology ~ The abs language ~ Netlists ~ The BALSATECH environment variable ~ The ABS Grammar ~ Netlist Format ]
  • Balsa Reference [ Summary ~ Balsa programs ~ Summary ~ Reserved words ~ Balsa Language Definition ]
  • The Breeze Language Definition [ Summary ~ Breeze Language Definition ]
  • The Breeze Components [ Summary ~ Activation driven control components ~ Channel termination components ~ Control to datapath interface components ~ Pull datapath components ~ Connection components ~ Non-delay-insensitive components ~ Simulation-only components ~ Breeze components ordered by name ]

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Download free Balsa: A Tutorial Guide.pdf ( 165 pages pdf file, 1.2 MB).

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