![]() ![]() Let’s step up the quality of our multi-clocked designs! Support Or make use of clock-enable in designs with medium footprint. So the major takeaway from this blog is that:ĭiscourage yourself from using clock dividers on FPGAs use PLLs/MMCMs instead. One disadvantage of this technique is that it may reduce the timing performance in larger designs, as flops with enable pin switching are usually slower and when clock-enable fan-out becomes higher, routing delays become high as well, tightening timing. Divided-by-any-integer clock-enable can be generated easily without the need of negative edge triggered flops.Entire design will be in a single clock domain, making timing constraints simpler. ![]() * Synchronous logic to be clocked at 25 MHz */ Verilog code to implement this technique will look like: /* Synchronous logic to generate Clock-Enable pulse 25 MHz from 100 MHz clk */ ![]() Then, use this clock-enable as a strobe to drive registers inside the synchronous logic driven by 100 MHz core clock.
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