Answers Database
1.5i XC4000XL PAR - Router fails to meet timing on TBUF nets, but re-route is successful.
Record #5686
Product Family: Software
Product Line: FPGA Implementation
Product Part: par
Product Version: 1.5i
Problem Title:
1.5i XC4000XL PAR - Router fails to meet timing on TBUF nets, but re-route is successful.
Problem Description:
Cases have been seen where PAR failed to meet timing on paths containing
multiple driver TBUF nets, but it was noticed that re-entrant routes using PAR
or EPIC easily met timing. This problem is due to to a bug where PAR routes
and locks nets during the "pre-assignment phase", but fails to later unlock the
nets as it should.
A re-entrent route or re-route in EPIC is successful because the net locking
mechanism is gone.
Solution 1:
This problem is fixed in vesion 2.1i, currently scheduled for 6/99. Meanwhile
the problem can be re-routed by using a re-entrant routing pass.
End of Record #5686 - Last Modified: 04/30/99 16:40 |
