Answers Database
M1.5i: Timing: BLOCKRAMA not being included in RAMS Timegroup in Virtex Timing Constraints
Record #6836
Product Family: Software
Product Line: Merged Core
Product Part: Timing
Problem Title:
M1.5i: Timing: BLOCKRAMA not being included in RAMS Timegroup in Virtex Timing Constraints
Problem Description:
Urgency: Standard
General Description:
When defining a timegroup in the timing constraints for a Virtex
device to include all RAMS, BLOCKRAMA is not included when
using the following syntax in a .ucf file:
TIMEGRP "ALLRAMS" = RAMS ("*") ;
or
TIMESPEC TS_01=FROM:FFS:TO:RAMS:12ns;
Solution 1:
If the BLOCKRAM is in a lower level of hierarchy of the
design will result in this situation. The workaround is to
create another timegroup with the following syntax to
include BLOCKRAMA:
TIMEGRP "ALLRAMS" = RAMS("*/*");
or
TIMEGRP "ALLRAMS"=RAMS(*_*);
End of Record #6836 - Last Modified: 07/14/99 08:58 |
