User guide

13-16
SDF Backannotation
If an SDF file backannotates delay values to an instance of a module
that must be renamed, the CELLTYPE entry in the SDF file for the
instance will contain the old identifier of the module, and ordinarily
this would cause VCS to display the following error message:
SDF Error: Instance instance_name is CELLTYPE of
"new_module_identifier" not "old_module_identifier",
ignoring
In this situation, to avoid editing the SDF file, include the
+sdf_nocheck_celltype compile-time option on the vcs
command line.
The SDF Configuration File
You can use the configuration file to control the following on a module
type basis as well as a global basis:
• min:typ:max selection
•Scaling
• Turnoff delay determination
• MIPD (module-input-delay) approximation policy for cases of
‘overlapping’ annotations to the same input port.
Additionally, there is a mapping command you can use to redirect the
target of IOPATH and TIMINGCHECK statements from the scope of the
INSTANCE to a specific IOPATH or TIMINGCHECK in its subhierarchy
for all instances of a specified module type.