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All tools can do timing depending on the input given to the tool. DC considers delays specified directly from constraints. It can even account for wire delays specified through WLM. The delays during DC stage of the flow are more of an approximation. Usually setup is fixed with DC as the clocks...
Create a list of all the gates which you don't want to use from your db. And set a dont_touch attribute on the list. DC will not use these cells for synthesis. All tech db's, I have worked on have the number of inputs in the name as a naming convention.
So I would suggest use the cell naming...
Think of a clock gate as "simple and" with an enable gating the clock. The reason you do this is to stop unnecessary toggles on the clock pin of flops. Even if the output doesn't toggle, the internal flop circuitry dissipates unnecessary power. Power saving can be achieved by simply gating the...
Okay, so if my design has different clocks, one being a generated clock with respect to another, can XST time such paths without clock constraints? Would it use a single cycle timing on these paths and generate a max freq?
More generally, if there is transfer of data from one clock domain to...
Hi,
I'm new to FPGA based designs and using XST on Xilinx ISE to synthesize my designs.
Xilinx reports a maximum freqency for the design when synthesis is done without using ucf or xcf.
How reliable is the freqency reported? And does the tool check all timing paths and then report a maximum...
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