Answers Database
M1 CONSTRAINTS: How to specify SAVESIG ("S"), "KEEP", or "X" constraints on nets using a UCF file.
Record #2570
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Problem Title:
M1 CONSTRAINTS: How to specify SAVESIG ("S"), "KEEP", or "X" constraints on nets using a UCF
file.
Problem Description:
Urgency: standard
General Description:
In the M1 release it is possible to specify the SAVESIG ("S"),
"KEEP", and "X" constraints on nets using the .UCF file.
Solution 1:
The syntax is documented in the Xilinx Libraries Guide
in the UCF syntax section of the "Attributes and Carry Logic"
chapter.
Syntax: net "<net_name>" <net_property>;
Example: net "mynet" "S";
End of Record #2570 - Last Modified: 03/02/99 18:05 |
