User guide

12-3
Delays and Timing
You can apply transport delays on all module path delays and all SDF
INTERCONNECT delays backannotated to a net from an SDF file.
For more details on SDF backannotation, see Chapter 15.
Inertial delays, in contrast, filter out all pulses that are narrower than
the delay. Figure 12-2 shows the waveforms for the same input and
output ports when you have not enabled transport delays for module
path delays.
Figure 12-2 Inertial Delay Waveforms
The pulse that begins at time 0 that is three time units wide does not
propagate to the output port because it is narrower than the seven
time unit module path delay. Neither does the narrow pulse that
begins at time 3. Note that the wide pulse that begins at time 6 does
propagate to the output port.
Gates, switches, MIPDs, and continuous assignments only have
inertial delays and inertial delays are the default type of delay for
module path delays and INTERCONNECT delays backannotated
from an SDF file to a net.