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-- $Id: rgbdrv_3x4mux.vhd 737 2016-02-28 09:07:18Z mueller $
--
-- Copyright 2016- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
--
-- This program is free software; you may redistribute and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation, either version 2, or at your option any later version.
--
-- This program is distributed in the hope that it will be useful, but
-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-- for complete details.
-- 
------------------------------------------------------------------------------
-- Module Name:    rgbdrv_3x4mux - syn
-- Description:    rgbled driver: mux three 4bit inputs
--
-- Dependencies:   xlib/iob_reg_o_gen
-- Test bench:     -
-- Target Devices: generic
-- Tool versions:  viv 2015.4; ghdl 0.31
--
-- Revision History: 
-- Date         Rev Version  Comment
-- 2016-02-27   737   1.0    Initial version (re-write, new logic)
-- 2016-02-20   734   0.1    First draft
------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
 
use work.slvtypes.all;
use work.xlib.all;
 
entity rgbdrv_3x4mux is                 -- rgbled driver: mux three 4bit inputs
  port (
    CLK : in slbit;                     -- clock
    RESET : in slbit := '0';            -- reset
    CE_USEC : in slbit;                 -- 1 us clock enable
    DATR : in slv4;                     -- red   data
    DATG : in slv4;                     -- green data
    DATB : in slv4;                     -- blue  data
    O_RGBLED0 : out slv3;               -- pad-o: rgb led 0
    O_RGBLED1 : out slv3;               -- pad-o: rgb led 1
    O_RGBLED2 : out slv3;               -- pad-o: rgb led 2
    O_RGBLED3 : out slv3                -- pad-o: rgb led 3
  );
end rgbdrv_3x4mux;
 
 
architecture syn of rgbdrv_3x4mux is
 
  signal R_LED : slv4  := "0001";
  signal R_COL : slv3  := "001";
  signal R_DIM : slbit := '1';
 
  signal RGB0  : slv3 := (others=>'0');
  signal RGB1  : slv3 := (others=>'0');
  signal RGB2  : slv3 := (others=>'0');
  signal RGB3  : slv3 := (others=>'0');
 
begin
 
  IOB_RGB0: iob_reg_o_gen
    generic map (DWIDTH => 3)
    port map (CLK => CLK, CE => '1', DO => RGB0, PAD => O_RGBLED0);
  IOB_RGB1: iob_reg_o_gen
    generic map (DWIDTH => 3)
    port map (CLK => CLK, CE => '1', DO => RGB1, PAD => O_RGBLED1);
  IOB_RGB2: iob_reg_o_gen
    generic map (DWIDTH => 3)
    port map (CLK => CLK, CE => '1', DO => RGB2, PAD => O_RGBLED2);
  IOB_RGB3: iob_reg_o_gen
    generic map (DWIDTH => 3)
    port map (CLK => CLK, CE => '1', DO => RGB3, PAD => O_RGBLED3);
 
  proc_regs: process (CLK)
  begin
 
    if rising_edge(CLK) then
      if RESET = '1' then
        R_LED <= "0001";
        R_COL <= "001";
        R_DIM <= '1';
      else
        if CE_USEC = '1' then
          R_DIM <= not R_DIM;
          if R_DIM = '1' then
            R_COL <= R_COL(1) & R_COL(0) & R_COL(2);
            if R_COL(2) = '1' then
              R_LED <= R_LED(2) & R_LED(1) & R_LED(0) & R_LED(3);
            end if;
          end if;
        end if;
      end if;
    end if;
 
  end process proc_regs;
 
  proc_mux: process (R_DIM, R_COL, R_LED, DATR, DATG, DATB)
  begin
    RGB0(0) <= (not R_DIM) and R_COL(0) and R_LED(0) and DATR(0);
    RGB0(1) <= (not R_DIM) and R_COL(1) and R_LED(0) and DATG(0);
    RGB0(2) <= (not R_DIM) and R_COL(2) and R_LED(0) and DATB(0);
 
    RGB1(0) <= (not R_DIM) and R_COL(0) and R_LED(1) and DATR(1);
    RGB1(1) <= (not R_DIM) and R_COL(1) and R_LED(1) and DATG(1);
    RGB1(2) <= (not R_DIM) and R_COL(2) and R_LED(1) and DATB(1);
 
    RGB2(0) <= (not R_DIM) and R_COL(0) and R_LED(2) and DATR(2);
    RGB2(1) <= (not R_DIM) and R_COL(1) and R_LED(2) and DATG(2);
    RGB2(2) <= (not R_DIM) and R_COL(2) and R_LED(2) and DATB(2);
 
    RGB3(0) <= (not R_DIM) and R_COL(0) and R_LED(3) and DATR(3);
    RGB3(1) <= (not R_DIM) and R_COL(1) and R_LED(3) and DATG(3);
    RGB3(2) <= (not R_DIM) and R_COL(2) and R_LED(3) and DATB(3);
  end process proc_mux;
 
end syn;