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