hw/calibration_read_register.vhd

   1 library ieee;
   2 use ieee.std_logic_1164.all;
   3 use ieee.std_logic_arith.all;
   4 use ieee.std_logic_unsigned.all;
   5 use ieee.numeric_std.all;
   6
   7 -- Calibration read register - returns fixed value
   8 -- Uses clock for writing the ID to the bus
   9
  10 entity calibration_read_register is
  11   generic
  12         (
  13                 id_g   : std_logic_vector(31 downto 0) := (others => '0')
  14         );
  15         port
  16         (
  17                 -- Data bus (read only)
  18                 data_o : out std_logic_vector(31 downto 0);
  19                 -- Bus signals
  20                 rd_i   : in std_logic;
  21                 ta_o   : out std_logic
  22         );
  23 end calibration_read_register;
  24
  25 architecture Behavioral of calibration_read_register is
  26 begin
  27
  28 memory_bus:
  29         process(rd_i)
  30         begin
  31                 ta_o     <= rd_i;
  32                 data_o   <= id_g;
  33         end process;
  34
  35 end Behavioral;