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Async RST:
if(rst = '1') then
sig1 <= '0';
elsif(clk'event and clk = '1') then
..........
Sync RST:
if(clk'event and clk = '1') then
if(rst = '1') then
sig1 <= '0';
else
.......
end if;
Notice 'rst', 'sig1' and 'clk'.
Do you understand?
good luck
chwpark
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