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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
library work;
use work.sdram_util.ALL;
entity sdram is
port (
clock_50 : in std_logic;
reset_n : in std_logic;
seven_seg : out std_logic_vector(7 downto 0);
sdram_clk : out std_logic;
sdram_cs_n : out std_logic;
sdram_cas_n : out std_logic;
sdram_ras_n : out std_logic;
sdram_we_n : out std_logic;
sdram_cke : out std_logic;
sdram_addr : out std_logic_vector(12 downto 0);
sdram_ba : out std_logic_vector(1 downto 0);
sdram_dq : inout std_logic_vector(15 downto 0);
sdram_dqm : out std_logic_vector(1 downto 0)
);
end entity;
architecture rtl of sdram is
component pllx2 IS
PORT
(
areset : IN STD_LOGIC := '0';
inclk0 : IN STD_LOGIC := '0';
c0 : OUT STD_LOGIC ;
locked : OUT STD_LOGIC
);
end component;
component sdram_mcu is
port (
clk_clk : in std_logic := 'X'; -- clk
reset_reset_n : in std_logic := 'X'; -- reset_n
-- pio_0_d_export : out std_logic_vector(7 downto 0); -- export
ebb_0_cs_n : out std_logic; -- cs_n
ebb_0_rnw : out std_logic; -- rnw
ebb_0_wait_n : in std_logic := 'X'; -- wait_n
ebb_0_addr : out std_logic_vector(15 downto 0); -- addr
ebb_0_data_in : in std_logic_vector(7 downto 0) := (others => 'X'); -- data_in
ebb_0_data_out : out std_logic_vector(7 downto 0); -- data_out
ebb_0_reset_n : out std_logic -- reset_n
);
end component sdram_mcu;
component sdram_ctrl is
port
(
clock_100 : in std_logic;
reset_n : in std_logic;
bus_cs_n : in std_logic;
bus_rnw : in std_logic;
bus_wait_n : out std_logic;
bus_addr : in addr_t;
bus_data_in : in data_t;
bus_data_out : out data_t;
sdram_clk : out std_logic;
sdram_cke : out std_logic;
sdram_cs_n : out std_logic;
sdram_cas_n : out std_logic;
sdram_ras_n : out std_logic;
sdram_we_n : out std_logic;
sdram_addr : out std_logic_vector(12 downto 0);
sdram_ba : out std_logic_vector(1 downto 0);
sdram_dq : inout data_t;
sdram_dqm : out dqm_t;
debug : out std_logic_vector(7 downto 0)
);
end component;
signal b_data_in8 : std_logic_vector(7 downto 0);
signal b_data_out8 : std_logic_vector(7 downto 0);
signal b_addr16: std_logic_vector(15 downto 0);
signal b_addr : addr_t;
signal b_data_in : data_t;
signal b_data_out : data_t;
signal b_cs_n : std_logic;
signal b_rnw : std_logic;
signal b_wait_n : std_logic;
signal pll_reset : std_logic;
signal mcu_clock : std_logic;
signal clock_100 : std_logic;
signal pll_locked : std_logic;
signal debug : std_logic_vector(7 downto 0);
signal global_reset_n : std_logic;
signal b_reset_n : std_logic;
signal buf8 : std_logic_vector(7 downto 0);
begin
pll: pllx2 port map (
pll_reset,
clock_50,
clock_100,
pll_locked );
mcu_clock <= clock_50;
u0 : component sdram_mcu port map (
clk_clk => mcu_clock, -- clk.clk
reset_reset_n => global_reset_n, -- reset.reset_n
-- pio_0_d_export => seven_seg, -- pio_0_d.export
ebb_0_cs_n => b_cs_n, -- ebb_0.cs_n
ebb_0_rnw => b_rnw, -- .rnw
ebb_0_wait_n => b_wait_n, -- .wait_n
ebb_0_addr => b_addr16, -- .addr
ebb_0_data_in => b_data_in8, -- .data
ebb_0_data_out => b_data_out8, -- .data
ebb_0_reset_n => b_reset_n
);
-- bodge buses together
b_data_in(7 downto 0) <= b_data_out8;
b_data_in(15 downto 8) <= (others =>'0');
ss_process: process (global_reset_n,b_rnw,b_cs_n,b_addr16) begin
if l2b_al(global_reset_n) then
buf8<=(others => '0');
elsif falling_edge(b_cs_n) and l2b_al(b_rnw) then
buf8 <= b_data_out8;
end if;
end process;
-- seven_seg <= buf8;
seven_seg <= debug;
--b_data_in8 <= buf8;
--b_wait_n <= '1';
b_data_in8 <= b_data_out(7 downto 0);
--seven_seg <= b_data_in8;
--b_data_in8 <= "01011010";
b_addr(15 downto 0) <= b_addr16;
b_addr(23 downto 16) <= (others => '0');
sdram_ctrl0: sdram_ctrl port map (
clock_100 => clock_100,
reset_n => b_reset_n,
bus_cs_n => b_cs_n,
bus_rnw => b_rnw,
bus_wait_n => b_wait_n,
bus_addr => b_addr,
bus_data_in => b_data_in,
bus_data_out => b_data_out,
sdram_clk => sdram_clk,
sdram_cke => sdram_cke,
sdram_cs_n => sdram_cs_n,
sdram_cas_n => sdram_cas_n,
sdram_ras_n => sdram_ras_n,
sdram_we_n => sdram_we_n,
sdram_addr => sdram_addr,
sdram_ba => sdram_ba,
sdram_dq => sdram_dq,
sdram_dqm => sdram_dqm,
debug => debug
);
pll_reset <= '0';
global_reset_n <= reset_n and pll_locked;
end architecture;
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