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LOOK i think that high speed signals are singnals with ver high frequency concerning the range of operation... but critical speed means the frequency at which the system that u work on it will behave unexpectaly.. u can be more clear if u tell me what system u work on
bye
high speed is one with less rise time...
to match setup time, you need to follow the HSS guideline....
in big word it doesnt mainly depend upon the frequecy....
while trigering signal are critical signals...(time sensitive)
like clock,stepping signal
Technology get change in after every 18 month even designer get confused with the word high speed which is present or which will be coming next . w:L sizes reduced , less capacitor ,less delay , more speed.
I think that he meant on critical sighnal path in digital circuits. Point is that after vhdl/verilog implementation some signals are more delayed trough digital logic than direct path. There are tools that can show which path is crictical, and then you can try to optimize your code to reduce critical path length, by better vhdl code...
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