Forum Discussion
Altera_Forum
Honored Contributor
18 years agoApologies for the confusion, I obviously didn't understand the use of the reference pin command. I'm using a system-synchronous clock setup:
http://img104.imagevenue.com/img.php?image=60343_timing_problems_122_1170lo.jpg From what i can see, i should still be able to use the inverted clock to launch the data, as long as i can ensure enough delay for Tco min: http://img185.imagevenue.com/img.php?image=61160_phase_delay_122_139lo.jpg Looking at the first picture i posted: http://img120.imagevenue.com/img.php..._122_747lo.jpg The clock network delay + data delay values should ensure that the hold and setup times are met. Would this seem correct? There's two issues i can see with implementing this, the first being ensuring i can register the data within half a clock cycle on the inverted clock and the other being how to configure the SDC constraints to recognize what i'm doing. Thanks for you feedback.