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144 lines
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HTML
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<section id="what-is-lpm">
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<h1>What Is LPM<a class="headerlink" href="#what-is-lpm" title="Link to this heading">¶</a></h1>
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<p>LPM (Library of Parameterized Modules) is EIS-IS standard 103-A. It is
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a standard library of abstract devices that are designed to be close
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enough to the target hardware to be easily translated, yet abstract
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enough to support a variety of target technologies without excessive
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constraints. Icarus Verilog uses LPM internally to represent idealized
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hardware, especially when doing target neutral synthesis.</p>
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<p>In general, the user does not even see the LPM that Icarus Verilog
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generates, because the LPM devices are translated into technology
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specific devices by the final code generator or target specific
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optimizers.</p>
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<section id="internal-uses-of-lpm">
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<h2>Internal Uses Of LPM<a class="headerlink" href="#internal-uses-of-lpm" title="Link to this heading">¶</a></h2>
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<p>Internally, Icarus Verilog uses LPM devices to represent the design in
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abstract, especially when synthesizing such functions as addition,
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flip-flops, etc. The <cite>synth</cite> functor generates LPM modules when
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interpreting procedural constructs. The functor generates the LPM
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objects needed to replace a behavioral description, and uses
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attributes to tag the devices with LPM properties.</p>
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<p>Code generators need to understand the supported LPM devices so that
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they can translate the devices into technology specific devices.</p>
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