T
Tedd Hadley
Guest
Hello,
How does one specify ANY arbitrary path in the design as a false
path, using define_false_path in Synplify?
define_false_path lets you specify "-to" "-from" in terms of ports
or registers, but not combinational instance pins. "-through" only
lets you specify an OR-list of instance pins or nets.
These restrictions seem to leave a large number of possible false
paths (combinational-pin to combinational-pin, for example)
unspecifiable to Synplify.
Other tools don't seem to have this problem, noteably XST and
Quartus II which allow any number of "through" nets on a path to
be identified, thus allowing any and all possible paths in a design
to be characterized.
Am I missing something? Surely the free tools don't outdo Synplify
on this one?
Best regards,
How does one specify ANY arbitrary path in the design as a false
path, using define_false_path in Synplify?
define_false_path lets you specify "-to" "-from" in terms of ports
or registers, but not combinational instance pins. "-through" only
lets you specify an OR-list of instance pins or nets.
These restrictions seem to leave a large number of possible false
paths (combinational-pin to combinational-pin, for example)
unspecifiable to Synplify.
Other tools don't seem to have this problem, noteably XST and
Quartus II which allow any number of "through" nets on a path to
be identified, thus allowing any and all possible paths in a design
to be characterized.
Am I missing something? Surely the free tools don't outdo Synplify
on this one?
Best regards,