pluto_hdl_adi/library/util_i2c_mixer/util_i2c_mixer.vhd

// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms. 
// The user should keep this in in mind while exploring these cores. 
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
//  (at the option of the user):
//
//   1. The GNU General Public License version 2 as published by the
//      Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
//   2.  An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************

-- ***************************************************************************
-- ***************************************************************************
-- ***************************************************************************
-- ***************************************************************************

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

library unisim;
use unisim.all;

entity util_i2c_mixer is
  generic (
    C_WIDTH: integer := 2
  );
  port (
	upstream_scl_T		: in  std_logic;
	upstream_scl_I		: in  std_logic;
	upstream_scl_O		: out std_logic;
	upstream_sda_T		: in  std_logic;
	upstream_sda_I		: in  std_logic;
	upstream_sda_O		: out std_logic;

	downstream_scl_T	: out std_logic;
	downstream_scl_I	: in  std_logic_vector(C_WIDTH - 1 downto 0);
	downstream_scl_O	: out std_logic_vector(C_WIDTH - 1 downto 0);
	downstream_sda_T	: out std_logic;
	downstream_sda_I	: in  std_logic_vector(C_WIDTH - 1 downto 0);
	downstream_sda_O	: out std_logic_vector(C_WIDTH - 1 downto 0)

  );
end util_i2c_mixer;

architecture IMP of util_i2c_mixer is
begin

upstream_scl_O <= '1' when (downstream_scl_I = (downstream_scl_I'range => '1')) else '0';
upstream_sda_O <= '1' when (downstream_sda_I = (downstream_sda_I'range => '1')) else '0';

downstream_scl_T <= upstream_scl_T;
downstream_sda_T <= upstream_sda_T;

GEN: for i in 0 to C_WIDTH - 1 generate
  downstream_scl_O(i) <= upstream_scl_I;
  downstream_sda_O(i) <= upstream_sda_I;
end generate GEN;

end IMP;