LED七段译码.txt
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上传日期:2013-03-21
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- -- BCD to Seven Segment Decoder
- -- The use of the std_logic literal '-' (don't care) is primarily for the synthesis tool.
- -- This example illustrates the use of the selected signal assignment.
- -- download from: www.pld.com.cn & www.fpga.com.cn
- LIBRARY ieee;
- USE ieee.std_logic_1164.ALL;
- ENTITY seg7dec IS
- PORT(bcdin : IN std_logic_vector(3 DOWNTO 0);
- segout : OUT std_logic_vector(6 DOWNTO 0));
- END seg7dec;
- ARCHITECTURE ver3 OF seg7dec IS
- BEGIN
- WITH bcdin SELECT
- segout <= "1000000" WHEN X"0",
- "1100111" WHEN X"1",
- "1101101" WHEN X"2",
- "0000011" WHEN X"3",
- "0100101" WHEN X"4",
- "0001001" WHEN X"5",
- "0001000" WHEN X"6",
- "1100011" WHEN X"7",
- "0000000" WHEN X"8",
- "0000001" WHEN X"9",
- "-------" WHEN OTHERS;
- END ver3;