Answers Database
PAR: "Number of GCLKS 5 out of 4" with Virtex Synplify netlist
Record #1073
Product Family: Software
Product Line: Synplicity
Product Part: Synplify
Product Version: 5.0
Problem Title:
PAR: "Number of GCLKS 5 out of 4" with Virtex Synplify netlist
Problem Description:
Urgency: Standard
General Description:
Synplify will insert 4 global clock buffers on the signals with
the highest fanout. However, if the design also contains
a BUFGDLL, then PAR will error with a the number or GCLKS
exceeding the available resources.
Solution 1:
The problem exists with Synplify. The BUFGDLL cell is not counted as a
BUFG resource and Synplify inserts another 4 BUFG or BUFGP cells violating
the resource limit of 4 for Virtex.
Please see (Xilinx Solution 4084) on how to disable BUFG insertion.
End of Record #1073 - Last Modified: 05/25/99 09:38 |
