You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
microwatt/core_dram_tb.vhdl

162 lines
4.7 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.common.all;
use work.wishbone_types.all;
use work.utils.all;
entity core_dram_tb is
generic (
MEMORY_SIZE : natural := (384*1024);
MAIN_RAM_FILE : string := "main_ram.bin";
DRAM_INIT_FILE : string := "";
DRAM_INIT_SIZE : natural := 16#c000#
);
end core_dram_tb;
architecture behave of core_dram_tb is
signal clk, rst: std_logic;
signal system_clk, soc_rst : std_ulogic;
-- testbench signals
constant clk_period : time := 10 ns;
-- Sim DRAM
signal wb_dram_in : wishbone_master_out;
signal wb_dram_out : wishbone_slave_out;
signal wb_ext_io_in : wb_io_master_out;
signal wb_ext_io_out : wb_io_slave_out;
signal wb_ext_is_dram_csr : std_ulogic;
signal wb_ext_is_dram_init : std_ulogic;
signal core_alt_reset : std_ulogic;
-- SPI
signal spi_sck : std_ulogic;
signal spi_cs_n : std_ulogic := '1';
signal spi_sdat_o : std_ulogic_vector(3 downto 0);
signal spi_sdat_oe : std_ulogic_vector(3 downto 0);
signal spi_sdat_i : std_ulogic_vector(3 downto 0);
signal fl_hold_n : std_logic;
signal fl_wp_n : std_logic;
signal fl_mosi : std_logic;
signal fl_miso : std_logic;
-- ROM size
function get_rom_size return natural is
begin
if MEMORY_SIZE = 0 then
return DRAM_INIT_SIZE;
else
return 0;
end if;
end function;
constant ROM_SIZE : natural := get_rom_size;
begin
soc0: entity work.soc
generic map(
SIM => true,
MEMORY_SIZE => MEMORY_SIZE,
RAM_INIT_FILE => MAIN_RAM_FILE,
HAS_DRAM => true,
DRAM_SIZE => 256 * 1024 * 1024,
DRAM_INIT_SIZE => ROM_SIZE,
CLK_FREQ => 100000000,
HAS_SPI_FLASH => true,
SPI_FLASH_DLINES => 4,
SPI_FLASH_OFFSET => 0
)
port map(
rst => soc_rst,
system_clk => system_clk,
wb_dram_in => wb_dram_in,
wb_dram_out => wb_dram_out,
wb_ext_io_in => wb_ext_io_in,
wb_ext_io_out => wb_ext_io_out,
wb_ext_is_dram_csr => wb_ext_is_dram_csr,
wb_ext_is_dram_init => wb_ext_is_dram_init,
spi_flash_sck => spi_sck,
spi_flash_cs_n => spi_cs_n,
spi_flash_sdat_o => spi_sdat_o,
spi_flash_sdat_oe => spi_sdat_oe,
spi_flash_sdat_i => spi_sdat_i,
alt_reset => core_alt_reset
);
flash: entity work.s25fl128s
generic map (
TimingModel => "S25FL128SAGNFI000_R_30pF",
LongTimming => false,
tdevice_PU => 10 ns,
tdevice_PP256 => 100 ns,
tdevice_PP512 => 100 ns,
tdevice_WRR => 100 ns,
UserPreload => TRUE
)
port map(
SCK => spi_sck,
SI => fl_mosi,
CSNeg => spi_cs_n,
HOLDNeg => fl_hold_n,
WPNeg => fl_wp_n,
RSTNeg => '1',
SO => fl_miso
);
fl_mosi <= spi_sdat_o(0) when spi_sdat_oe(0) = '1' else 'Z';
fl_miso <= spi_sdat_o(1) when spi_sdat_oe(1) = '1' else 'Z';
fl_wp_n <= spi_sdat_o(2) when spi_sdat_oe(2) = '1' else 'Z';
fl_hold_n <= spi_sdat_o(3) when spi_sdat_oe(3) = '1' else '1' when spi_sdat_oe(0) = '1' else 'Z';
spi_sdat_i(0) <= fl_mosi;
spi_sdat_i(1) <= fl_miso;
spi_sdat_i(2) <= fl_wp_n;
spi_sdat_i(3) <= fl_hold_n;
dram: entity work.litedram_wrapper
generic map(
DRAM_ABITS => 24,
DRAM_ALINES => 1,
DRAM_DLINES => 16,
DRAM_PORT_WIDTH => 128,
PAYLOAD_FILE => DRAM_INIT_FILE,
PAYLOAD_SIZE => ROM_SIZE
)
port map(
clk_in => clk,
rst => rst,
system_clk => system_clk,
system_reset => soc_rst,
core_alt_reset => core_alt_reset,
wb_in => wb_dram_in,
wb_out => wb_dram_out,
wb_ctrl_in => wb_ext_io_in,
wb_ctrl_out => wb_ext_io_out,
wb_ctrl_is_csr => wb_ext_is_dram_csr,
wb_ctrl_is_init => wb_ext_is_dram_init
);
clk_process: process
begin
clk <= '0';
wait for clk_period/2;
clk <= '1';
wait for clk_period/2;
end process;
rst_process: process
begin
rst <= '1';
wait for 10*clk_period;
rst <= '0';
wait;
end process;
jtag: entity work.sim_jtag;
end;