Delta delay

In VHDL simulations, all signal assignments occur with some infinitesimal delay, known as delta delay.[1] Technically, delta delay is of no measurable unit, but from a hardware design perspective one should think of delta delay as being the smallest time unit one could measure, such as a femtosecond (fs).

References
  1. Bhasker, Jayaram (1999). A Vhdl Primer. Prentice Hall PTR, 1999. pp. 31, 46. ISBN 9780130965752.


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