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What logic gets synthesized when I use an integer instead of a reg variable as a storage element? Is use of integer recommended?
An integer can take place of a reg as a storage element. An instance to illustrate this is as follows:
In this example, variable int_tmp is defined as an integer, rather than reg that it would normally be (the reg declaration is commented in the instance for illustration). Note that, although default width of the integer declaration is 32 bits, final result of the int_tmp registers synthesis yield is only 4 bits. This is since the optimiser in the synthesis tool removes the unnecessary higher order bits, in order to minimize the area.
Even though the use of integer as shown above is a legal construct, it's not recommended for the synthesis of storage elements.
Generally the register storage is faster than cache andmain memory. Also register addressing uses much shorter addresses than addresses for cache and main memory. Though the number
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