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Altera_Forum's avatar
Altera_Forum
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15 years ago

Is is gonna be very long propagation time for multi-bits mux?

I did a mux that take a 18-bit input and a 19-bit input and a 18 bit-output. It seems that from the simulation, it takes really long time to make the change to the output everytime one of the ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi FvM,

Is this the pin to pin delay i should show？

And a question: what's the difference between pin-to-pin delay and internal delays? Why it doesn't affect fmax?

I used cyclone.

and my code: 


module mux(d,o,mux_sel,mux_out);
input  d;
input  o;
input mux_sel;
output reg  mux_out;
always@(*)
  if(mux_sel)
    mux_out=o;
  else
    mux_out=d;
    
endmodule