Verilog And VHDL Essay

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Hardware description languages have been used for a long time and the primary hardware description languages in use are Verilog and VHDL. VHDL is a VHSIC Hardware Description Language and VHSIC is a very high speed integrated circuit gate level through system design and verification. Verilog is primarily targeted for design of application specific integrated circuits. Hardware description languages are used for hardware systems because of their parallelism. This parallelism results in increased speed, which is often the main reason to implement something in hardware. They can run a big number of parallel activities that interact frequently over possibly very small shared resources. HDLs are used because software programming languages are sequential instead of parallel. Verilog and VHDL have sequential processes, stack-based procedure calls, traditional stack-based updatable variables, and cooperative multitasking.
In HDLs, the problem of parallel updates to a shared resource is solved by updating only one “process” and exactly one possible new value for x is specified for every clo...

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