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microwatt/fpga/top-generic.vhdl

92 lines
2.1 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
library work;
use work.wishbone_types.all;
entity toplevel is
generic (
MEMORY_SIZE : positive := (384*1024);
RAM_INIT_FILE : string := "firmware.hex";
RESET_LOW : boolean := true;
CLK_INPUT : positive := 100000000;
CLK_FREQUENCY : positive := 100000000;
DISABLE_FLATTEN_CORE : boolean := false
);
port(
ext_clk : in std_ulogic;
ext_rst : in std_ulogic;
-- UART0 signals:
uart0_txd : out std_ulogic;
uart0_rxd : in std_ulogic
);
end entity toplevel;
architecture behaviour of toplevel is
-- Reset signals:
signal soc_rst : std_ulogic;
signal pll_rst : std_ulogic;
-- Internal clock signals:
signal system_clk : std_ulogic;
signal system_clk_locked : std_ulogic;
-- Dummy DRAM
signal wb_dram_in : wishbone_master_out;
signal wb_dram_out : wishbone_slave_out;
begin
reset_controller: entity work.soc_reset
generic map(
RESET_LOW => RESET_LOW
)
port map(
ext_clk => ext_clk,
pll_clk => system_clk,
pll_locked_in => system_clk_locked,
ext_rst_in => ext_rst,
pll_rst_out => pll_rst,
rst_out => soc_rst
);
clkgen: entity work.clock_generator
generic map(
CLK_INPUT_HZ => CLK_INPUT,
CLK_OUTPUT_HZ => CLK_FREQUENCY
)
port map(
ext_clk => ext_clk,
pll_rst_in => pll_rst,
pll_clk_out => system_clk,
pll_locked_out => system_clk_locked
);
-- Main SoC
soc0: entity work.soc
generic map(
MEMORY_SIZE => MEMORY_SIZE,
RAM_INIT_FILE => RAM_INIT_FILE,
RESET_LOW => RESET_LOW,
SIM => false,
CLK_FREQ => CLK_FREQUENCY,
DISABLE_FLATTEN_CORE => DISABLE_FLATTEN_CORE
)
port map (
system_clk => system_clk,
rst => soc_rst,
uart0_txd => uart0_txd,
uart0_rxd => uart0_rxd,
wb_dram_out => wb_dram_out,
alt_reset => '0'
);
-- Dummy DRAM
wb_dram_out.ack <= wb_dram_in.cyc and wb_dram_in.stb;
wb_dram_out.dat <= x"FFFFFFFFFFFFFFFF";
wb_dram_out.stall <= wb_dram_in.cyc and not wb_dram_out.ack;
end architecture behaviour;