Answers Database
M1.4 Map: DROP_SPEC property takes priority over other TIMESPECs regardless of where it is specified in the flow
Record #2893
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 1.4.
Problem Title:
M1.4 Map: DROP_SPEC property takes priority over other TIMESPECs regardless of where it is
specified in the flow
Problem Description:
Urgency: Standard
Reference #: 18676
General Description: M1.4:
The DROP_SPEC is a TIMESPEC-related constraint that allows
you to designate that timing analysis should not be performed
on a specific TIMESPEC property. DROP_SPEC can only be
specified within constraint files.
Map does not follow standard constraint priority ordering
when implementing the DROP_SPEC constraint. The standard
way of determining which set of constraints takes priority
depends on what point in the flow the set of constraints is
specified, as follows:
(Lowest to Highest:
Schematic -> .NCF file -> .UCF file -> .PCF file)
This means that constraints specified in a .NCF file
(including DROP_SPEC), may be overridden by other constraints
specified in constraint files read in by M1 at later stages
of the implementation flow.
Currently the DROP_SPEC constraint takes priority no matter
where it is specified within the flow.
Solution 1:
Currently there is no work around.
End of Record #2893 - Last Modified: 10/07/97 23:02 |
