library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

use work.wishbone_package.all;
use work.crossbar_package.all;
use work.ebr_package.all;
use work.lm32_package.all;
use work.simple_pll_package.all;

entity example is
   port(
      clk_base	: in std_logic;
      rstn_base	: in std_logic
   );
end example;

architecture rtl of example is
   constant masters : natural := 2;
   constant slaves  : natural := 2;
   
   signal clk : std_logic;
   signal rst : std_logic;
   signal locked : std_logic;
   
   signal intercon_slave_i  : wishbone_slave_in_vector(masters-1 downto 0);
   signal intercon_slave_o  : wishbone_slave_out_vector(masters-1 downto 0);
   signal intercon_master_i : wishbone_master_in_vector(slaves-1 downto 0);
   signal intercon_master_o : wishbone_master_out_vector(slaves-1 downto 0);
begin
   rst <= not rstn_base or not locked;

   clk_pll : simple_pll
      generic map
      (
         c0_mul		=> 2,
	 c0_div		=> 1,
	 c1_mul		=> 4,
	 c1_div		=> 1,
	 in_freq	=> 50000
      )
      port map
      (
         inclk0		=> clk_base,
	 c0		=> clk,
	 c1		=> open,
	 locked		=> locked
      );
      
   ebr_memory : ebr
      generic map
      (
         size		=> 4096
      )
      port map
      (
         clk		=> clk,
         rst		=> rst,
         slave_i	=> intercon_master_o(0),
         slave_o	=> intercon_master_i(0)
      );
   
   monitor_memory : ebr
      generic map
      (
         size		=> 2048
      )
      port map
      (
         clk		=> clk,
         rst		=> rst,
         slave_i	=> intercon_master_o(1),
         slave_o	=> intercon_master_i(1)
      );
   
   cpu0 : lm32_vhdl
      port map
      (
         clk		=> clk,
         rst		=> rst,
         interrupt	=> x"00000000",
         data_o		=> intercon_slave_i(0),
         data_i		=> intercon_slave_o(0),
         inst_o		=> intercon_slave_i(1),
         inst_i		=> intercon_slave_o(1)
      );
   
   intercon : crossbar 
      generic map
      (
         masters	=> masters,
         slaves		=> slaves,
         -- Device 0 has range 00000000-00000fff
         -- Device 1 has range 10000000-100007ff
         address	=> (0 => x"00000000", 
	                    1 => x"10000000"), 
         mask		=> (0 => x"fffff000",
	                    1 => x"fffff800")
      )
      port map
      (
         clk		=> clk,
         rst		=> rst, 
         slave_i	=> intercon_slave_i,
         slave_o	=> intercon_slave_o,
         master_i	=> intercon_master_i, 
         master_o	=> intercon_master_o
      );
end;