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Resets - when to use them?

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digi001

digi001

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In a larger design, is it necessary for every always block that includes registers to have a RESET?

Should only some of the more critical always blocks include resets?

If every single always block gets the same reset single, doesn't this lead to slower designs due to a high fan out?
 

It depends on the design. A design may be functional regardless of what register contents you start with - if so, no reset of those registers would be needed. On the other hand, a design may include registers that have illegal values, must start with a 0 count, whatever. In which case resetting those registers would be needed. Some registers may need a reset value, other registers might be a don't care for reset purposes.

In any case the size of a design is irrelevant (although of course for practical circuits, in larger designs you have a a bigger chance there's something in there that needs to be reset).
 
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