cmoda7_sram_dummy.vhd

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-- $Id: cmoda7_sram_dummy.vhd 1181 2019-07-08 17:00:50Z mueller $
-- SPDX-License-Identifier: GPL-3.0-or-later
-- Copyright 2017- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
-- 
------------------------------------------------------------------------------
-- Module Name:    cmoda7_sram_dummy - syn
-- Description:    cmoda7 target (base; serport loopback, sram protect)
--
-- Dependencies:   -
-- To test:        tb_cmoda7_sram
-- Target Devices: generic
-- Tool versions:  viv 2016.4; ghdl 0.34
--
-- Revision History: 
-- Date         Rev Version  Comment
-- 2017-06-04   906   1.0    Initial version
------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
 
use work.slvtypes.all;
 
entity cmoda7_sram_dummy is             -- CmodA7 dummy (base+sram)
                                        -- implements cmoda7_sram_aif
  port (
    I_CLK12 : in slbit;                 -- 12 MHz board clock
    I_RXD : in slbit;                   -- receive data (board view)
    O_TXD : out slbit;                  -- transmit data (board view)
    I_BTN : in slv2;                    -- c7 buttons
    O_LED : out slv2;                   -- c7 leds
    O_RGBLED0_N : out slv3;             -- c7 rgb-led 0        (act.low)
    O_MEM_CE_N : out slbit;             -- sram: chip enable   (act.low)
    O_MEM_WE_N : out slbit;             -- sram: write enable  (act.low)
    O_MEM_OE_N : out slbit;             -- sram: output enable (act.low)
    O_MEM_ADDR  : out slv19;            -- sram: address lines
    IO_MEM_DATA : inout slv8            -- sram: data lines
  );
end cmoda7_sram_dummy;
 
architecture syn of cmoda7_sram_dummy is
  
begin
 
  O_TXD    <= I_RXD;                    -- loop back serport
 
  O_LED    <= I_BTN;                    -- mirror BTN on LED
 
  O_RGBLED0_N(0) <= not I_BTN(0);       -- mirror BTN on RGBLED   0 -> red
  O_RGBLED0_N(1) <= not I_BTN(1);       --                        1 -> green
  O_RGBLED0_N(2) <= not (I_BTN(0) and I_BTN(1)); --             0+1 -> white
 
  O_MEM_CE_N  <= '1';
  O_MEM_WE_N  <= '1';
  O_MEM_OE_N  <= '1';
  O_MEM_ADDR  <= (others=>'0');
  IO_MEM_DATA <= (others=>'Z');
    
end syn;