DELAY MODELING

Delays are timing parameters given by the user for modeling physical characteristics of hardware.



Delays are specified in signal assignment statements only.

Delays should NOT be used in variable assignments.

INERTIAL DELAY

• It is used to model the inherent inertia of physical devices.

• Example:

– The input value must be stable for a specified minimum pulse duration before the value is allowed to propagate to the output.

– If the input is not stable for the specified limit, no output change occurs.

TRANSPORT DELAY

• It represents pure propagation delay i.e., wires and interconnect delays.

• Signal value is assigned with a specified delay independent of the width of the input waveform.

DELAYS




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