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yes y are right ,first i want to count the number of input samples,so i need a counter then when samples terminated and distances calculated i use the accumulator ,for example
if distances are 1+3+6+3=7 and the number of samples be 4
should i use another entity to make this ?
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well just a clocked process will do.
process(clk)
begin
if rising_edge(clk) then
if clear = '1' then
sum <= accum;
accum <= (others => '0');
else
accum <= accum +distance;
end if;
end if;
end process;
assuming distance is an incoming stream of samples, one per clock period. you control the clear signal using a counter for your samples.
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