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comparator with a single input

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post some example code, so I get what you mean.
 

Code: 
if (enable = '0') then
			data_count <= 0;
			pre_count <= 0;
			pre_count_1 <= 0;
			pre_count_2 <= 0;
		
		elsif (data_sync(1) = '1') then
			
			pre_count <= 0;
		elsif rising_edge(clk) then
			pre_count <= pre_count + 1;
		end if;

say both the elsif statement are true, what will happen ? will both be executed ?
 

no. the code is sequential, so the higher of the elsif's taken, and the other is ignored. It can only take 1 if branch per process iteration, just like in any programming language. This gives an implicit priority in the signals.
 

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