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<p>However, in contrast to most software <a href="page.php?w=programming_language">programming language</a>s, HDLs also include an explicit notion of time, which is a primary attribute of hardware. Languages whose only characteristic is to express circuit connectivity between a hierarchy of blocks are properly classified as <a href="page.php?w=netlist">netlist</a> languages used in electric <a href="page.php?w=computer-aided_design">computer-aided design</a>. HDL can be used to express designs in structural, behavioral or register-transfer-level</p><p>
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