Generate 1Hz clock from a 50MHz clock

ghxy00,

you are actually creating ripple clocks in your design, so it is a fair warning you get. You can avoid the ripple clock warning by using the global 50 MHz clock for all cascaded counters and use the carries from the previous chain as enables for the dollwing chain. But if you do that by simple combinatorial logic you will get a slower counter again. That's why I used registered look-ahead carries in my example.