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seg7.vhd
executable file
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seg7.vhd
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-- ZX Spectrum for Altera DE1
--
-- Copyright (c) 2009-2011 Mike Stirling
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- * Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- * Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written agreement from the author.
--
-- * License is granted for non-commercial use only. A fee may not be charged
-- for redistributions as source code or in synthesized/hardware form without
-- specific prior written agreement from the author.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
library ieee;
use ieee.std_logic_1164.all;
-- Convert BCD to 7-segment display characters
entity seg7 is
port (
D : in std_logic_vector(3 downto 0);
Q : out std_logic_vector(6 downto 0)
);
end seg7;
architecture seg7_arch of seg7 is
begin
Q <= "1000000" when D = "0000" else
"1111001" when D = "0001" else
"0100100" when D = "0010" else
"0110000" when D = "0011" else
"0011001" when D = "0100" else
"0010010" when D = "0101" else
"0000010" when D = "0110" else
"1111000" when D = "0111" else
"0000000" when D = "1000" else
"0010000" when D = "1001" else
"0001000" when D = "1010" else
"0000011" when D = "1011" else
"1000110" when D = "1100" else
"0100001" when D = "1101" else
"0000110" when D = "1110" else
"0001110";
end seg7_arch;