Forum Discussion
Altera_Forum
Honored Contributor
9 years agoBut it should try get more Tsu time in dataout[0] and more Th time in dataout[1]?
Is my understanding correct that with these constrains I am saying that i want dataout[0] valid 1ns before clkout and 0.5 ns after?# For bus bit 0
set_output_delay -max 1.0
-clock }]
set_output_delay -min -0.5
-clock }]
set_output_delay -max 1.0
-clock
-clock_fall }] -add_delay
set_output_delay -min -0.5
-clock
-clock_fall }] -add_delay And with these lines i want dataout[1] valid 0.5ns before clkout and 1 ns after? # For bus bit 1
set_output_delay -max 0.5
-clock }]
set_output_delay -min -1.0
-clock }]
set_output_delay -max 0.5
-clock
-clock_fall }] -add_delay
set_output_delay -min -1.0
-clock
-clock_fall }] -add_delay If my constrains correct then in dataout[0] case fitter should try to make less delay to achieve positive slac on Tsu requirement and Th requirement should require less effort? For dataout[1] fitter should try to add more delay to achieve Th requirement and Tsu requirement should require less effort?