User guide

13-40
SDF Backannotation
noIopath
Specifies disabling the module path delays in the specified module
instances.
noSpecify
Specifies disabling the specify blocks in the specified module
instances.
noTiming
Specifies disabling the timing checks in the specified module
instances.
Using the timopt Timing Optimizer
The timopt timing optimizer can yield large speedups for full-timing
gate-level designs. Timopt makes its optimizations based on the clock
signals and sequential devices that it identifies in the design. Timopt
is particularly useful when you use SDF files because SDF files can’t
be used with RadiantTechnology (+rad).
You enable timopt with the +timopt+clock_period
compile-time option, where the argument is the shortest clock period
(or clock cycle) of the clock signals in your design. For example:
+timopt+100ns
This options specifies that the shortest clock period is 100ns.
Timopt first displays the number of sequential devices that it finds in
the design and the number of these sequential devices to which it
might be able to apply optimizations. For example:
Total Sequential Elements : 2001
Total Sequential Elements 2001, Optimizable 2001