git.zerfleddert.de Git - raggedstone/blob - heartbeat/source/pfs.vhd

   1 --+-----------------------------------------+
   2 --|  pfs                                    |
   3 --+-----------------------------------------+
   4
   5 library ieee;
   6 use ieee.std_logic_1164.all;
   7
   8 entity pfs is
   9 port (
  10    clk          : in std_logic;
  11    a            : in std_logic;
  12    y            : out std_logic
  13
  14 );
  15 end pfs;
  16
  17 architecture rtl of pfs is
  18
  19         signal a_s      : std_logic;
  20
  21 begin
  22
  23         SYNCP: process( clk, a )
  24         begin
  25
  26         if ( rising_edge(clk) ) then
  27                         a_s <= a;
  28                 end if;
  29
  30         end process SYNCP;
  31
  32         y <= a and (not a_s);
  33
  34 end rtl;
  35