Subversion Repositories btc_dsha256

----------------------------------------------------------------------------------------------------------------------

-- Copyright (c) 2013 VariStream

-- Author : Yu Peng 

-- Description:

--   Edge detector

--   If iEdge = 1 > rising edge detect

--   If iEdge = 0 > falling edge detect

----------------------------------------------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity edgedtc is port

        (

                iD                              : in            std_logic;

                iClk                    : in            std_logic;

                iResetSync_Clk  : in            std_logic;

                iEdge                   : in            std_logic;

                oQ                              : out           std_logic := '0'

        );

end edgedtc;

architecture edgedtc of edgedtc is

        signal sFf      : std_logic_vector(1 downto 0) := "00";

begin

        edgedtc:process(iClk)

                begin

                if rising_edge(iCLk) then

                        if iResetSync_Clk = '1' THEN

                                oQ <= '0';

                                sFf <= iEdge & iEdge;--"00";

                        else

                                sFf(0) <= iD;

                                sFf(1) <= sFf(0);

                                oQ <= (not iEdge xor sFf(0)) and (iEdge xor sFf(1));

                        end if;

                end if;

        end process;

end edgedtc;