说明: elsif st1(7 downto 0)="11111110" then st1(7 downto 0)<="11111101";data<=d1; elsif st1(7 downto 0)="11111110" then st1(7 downto 0)<="11111101";data<=d1; elsif st1(7 downto 0)="11111110" then st1(7 downto 0)<="11111101";data<=d1;
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