[oc] Clock frequency generator

[cool_canguy@indiatimes.com]

hello,

i am looking to match the system clock with a square wave in VHDL. so 
in my code for SQ wave...if I am generating wave as below

counter := counter + 1;

if counter = 40 then
sqwave_out <= '1';
end if;

if counter = 80 then
sqwave_out <= '0';
counter := 0;
end if;

where sqwave_out is the sq. wave then how can I match the system 
clk with this wave. ie compare both...can someone demonstrate this to 
me in VHDL code? 

many thanks,
Victor
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