diff options
Diffstat (limited to 'zpu/hdl/zpu4/src/sim_small_fpga_top.vhd')
-rw-r--r-- | zpu/hdl/zpu4/src/sim_small_fpga_top.vhd | 356 |
1 files changed, 177 insertions, 179 deletions
diff --git a/zpu/hdl/zpu4/src/sim_small_fpga_top.vhd b/zpu/hdl/zpu4/src/sim_small_fpga_top.vhd index b51fea0..5c05881 100644 --- a/zpu/hdl/zpu4/src/sim_small_fpga_top.vhd +++ b/zpu/hdl/zpu4/src/sim_small_fpga_top.vhd @@ -1,179 +1,177 @@ --------------------------------------------------------------------------------- --- Company: --- Engineer: --- --- Create Date: 20:15:31 04/14/05 --- Design Name: --- Module Name: fpga_top - behave --- Project Name: --- Target Device: --- Tool versions: --- Description: --- --- Dependencies: --- --- Revision: --- Revision 0.01 - File Created --- Additional Comments: --- --------------------------------------------------------------------------------- -library IEEE; -use IEEE.STD_LOGIC_1164.ALL; -use IEEE.STD_LOGIC_ARITH.ALL; -use IEEE.STD_LOGIC_UNSIGNED.ALL; - ----- Uncomment the following library declaration if instantiating ----- any Xilinx primitives in this code. -library UNISIM; -use UNISIM.VComponents.all; - -library work; -use work.zpu_config.all; -use work.zpupkg.all; - -entity fpga_top is -end fpga_top; - -architecture behave of fpga_top is - - -signal clk : std_logic; - -signal areset : std_logic; - - -component zpu_io is - generic ( - log_file: string := "log.txt" - ); - port( - clk : in std_logic; - areset : in std_logic; - busy : out std_logic; - writeEnable : in std_logic; - readEnable : in std_logic; - write : in std_logic_vector(wordSize-1 downto 0); - read : out std_logic_vector(wordSize-1 downto 0); - addr : in std_logic_vector(maxAddrBit downto minAddrBit) - ); -end component; - - - - - -signal mem_busy : std_logic; -signal mem_read : std_logic_vector(wordSize-1 downto 0); -signal mem_write : std_logic_vector(wordSize-1 downto 0); -signal mem_addr : std_logic_vector(maxAddrBitIncIO downto 0); -signal mem_writeEnable : std_logic; -signal mem_readEnable : std_logic; -signal mem_writeMask: std_logic_vector(wordBytes-1 downto 0); - -signal enable : std_logic; - -signal dram_mem_busy : std_logic; -signal dram_mem_read : std_logic_vector(wordSize-1 downto 0); -signal dram_mem_write : std_logic_vector(wordSize-1 downto 0); -signal dram_mem_writeEnable : std_logic; -signal dram_mem_readEnable : std_logic; -signal dram_mem_writeMask: std_logic_vector(wordBytes-1 downto 0); - - -signal io_busy : std_logic; - -signal io_mem_read : std_logic_vector(wordSize-1 downto 0); -signal io_mem_writeEnable : std_logic; -signal io_mem_readEnable : std_logic; - - -signal dram_ready : std_logic; -signal io_ready : std_logic; -signal io_reading : std_logic; - - -signal break : std_logic; - -begin - poweronreset: roc port map (O => areset); - - - - zpu: zpu_core port map ( - clk => clk , - areset => areset, - enable => enable, - in_mem_busy => mem_busy, - mem_read => mem_read, - mem_write => mem_write, - out_mem_addr => mem_addr, - out_mem_writeEnable => mem_writeEnable, - out_mem_readEnable => mem_readEnable, - mem_writeMask => mem_writeMask, - interrupt => '0', - break => break); - - - ioMap: zpu_io port map ( - clk => clk, - areset => areset, - busy => io_busy, - writeEnable => io_mem_writeEnable, - readEnable => io_mem_readEnable, - write => mem_write, - read => io_mem_read, - addr => mem_addr(maxAddrBit downto minAddrBit) - ); - - dram_mem_writeEnable <= mem_writeEnable and not mem_addr(ioBit); - dram_mem_readEnable <= mem_readEnable and not mem_addr(ioBit); - io_mem_writeEnable <= mem_writeEnable and mem_addr(ioBit); - io_mem_readEnable <= mem_readEnable and mem_addr(ioBit); - mem_busy <= io_busy; - - - - -- Memory reads either come from IO or DRAM. We need to pick the right one. - memorycontrol: - process(dram_mem_read, dram_ready, io_ready, io_mem_read) - begin - mem_read <= (others => 'U'); - if dram_ready='1' then - mem_read <= dram_mem_read; - end if; - - if io_ready='1' then - mem_read <= (others => '0'); - mem_read <= io_mem_read; - end if; - end process; - - - io_ready <= (io_reading or io_mem_readEnable) and not io_busy; - - memoryControlSync: - process(clk, areset) - begin - if areset = '1' then - enable <= '0'; - io_reading <= '0'; - dram_ready <= '0'; - elsif (clk'event and clk = '1') then - enable <= '1'; - io_reading <= io_busy or io_mem_readEnable; - dram_ready<=dram_mem_readEnable; - - end if; - end process; - - -- wiggle the clock @ 100MHz - clock : PROCESS - begin - clk <= '0'; - wait for 5 ns; - clk <= '1'; - wait for 5 ns; - end PROCESS clock; - - -end behave; +--------------------------------------------------------------------------------
+-- Company:
+-- Engineer:
+--
+-- Create Date: 20:15:31 04/14/05
+-- Design Name:
+-- Module Name: fpga_top - behave
+-- Project Name:
+-- Target Device:
+-- Tool versions:
+-- Description:
+--
+-- Dependencies:
+--
+-- Revision:
+-- Revision 0.01 - File Created
+-- Additional Comments:
+--
+--------------------------------------------------------------------------------
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+---- Uncomment the following library declaration if instantiating
+---- any Xilinx primitives in this code.
+library UNISIM;
+use UNISIM.VComponents.all;
+
+library work;
+use work.zpu_config.all;
+use work.zpupkg.all;
+
+entity fpga_top is
+end fpga_top;
+
+architecture behave of fpga_top is
+
+
+signal clk : std_logic;
+
+signal areset : std_logic;
+
+
+component zpu_io is
+ generic (
+ log_file: string := "log.txt"
+ );
+ port(
+ clk : in std_logic;
+ areset : in std_logic;
+ busy : out std_logic;
+ writeEnable : in std_logic;
+ readEnable : in std_logic;
+ write : in std_logic_vector(wordSize-1 downto 0);
+ read : out std_logic_vector(wordSize-1 downto 0);
+ addr : in std_logic_vector(maxAddrBit downto minAddrBit)
+ );
+end component;
+
+
+
+
+
+signal mem_busy : std_logic;
+signal mem_read : std_logic_vector(wordSize-1 downto 0);
+signal mem_write : std_logic_vector(wordSize-1 downto 0);
+signal mem_addr : std_logic_vector(maxAddrBitIncIO downto 0);
+signal mem_writeEnable : std_logic;
+signal mem_readEnable : std_logic;
+signal mem_writeMask: std_logic_vector(wordBytes-1 downto 0);
+
+signal enable : std_logic;
+
+signal dram_mem_busy : std_logic;
+signal dram_mem_read : std_logic_vector(wordSize-1 downto 0);
+signal dram_mem_write : std_logic_vector(wordSize-1 downto 0);
+signal dram_mem_writeEnable : std_logic;
+signal dram_mem_readEnable : std_logic;
+signal dram_mem_writeMask: std_logic_vector(wordBytes-1 downto 0);
+
+
+signal io_busy : std_logic;
+
+signal io_mem_read : std_logic_vector(wordSize-1 downto 0);
+signal io_mem_writeEnable : std_logic;
+signal io_mem_readEnable : std_logic;
+
+
+signal dram_ready : std_logic;
+signal io_ready : std_logic;
+signal io_reading : std_logic;
+
+
+signal break : std_logic;
+
+begin
+ poweronreset: roc port map (O => areset);
+
+
+
+ zpu: zpu_core port map (
+ clk => clk ,
+ areset => areset,
+ enable => enable,
+ in_mem_busy => mem_busy,
+ mem_read => mem_read,
+ mem_write => mem_write,
+ out_mem_addr => mem_addr,
+ out_mem_writeEnable => mem_writeEnable,
+ out_mem_readEnable => mem_readEnable,
+ mem_writeMask => mem_writeMask,
+ interrupt => '0',
+ break => break);
+
+
+ ioMap: zpu_io port map (
+ clk => clk,
+ areset => areset,
+ busy => io_busy,
+ writeEnable => io_mem_writeEnable,
+ readEnable => io_mem_readEnable,
+ write => mem_write,
+ read => io_mem_read,
+ addr => mem_addr(maxAddrBit downto minAddrBit)
+ );
+
+ dram_mem_writeEnable <= mem_writeEnable and not mem_addr(ioBit);
+ dram_mem_readEnable <= mem_readEnable and not mem_addr(ioBit);
+ io_mem_writeEnable <= mem_writeEnable and mem_addr(ioBit);
+ io_mem_readEnable <= mem_readEnable and mem_addr(ioBit);
+ mem_busy <= io_busy;
+
+
+
+ -- Memory reads either come from IO or DRAM. We need to pick the right one.
+ memorycontrol:
+ process(dram_mem_read, dram_ready, io_ready, io_mem_read)
+ begin
+ mem_read <= (others => 'U');
+ if dram_ready='1' then
+ mem_read <= dram_mem_read;
+ end if;
+
+ if io_ready='1' then
+ mem_read <= (others => '0');
+ mem_read <= io_mem_read;
+ end if;
+ end process;
+
+
+ io_ready <= (io_reading or io_mem_readEnable) and not io_busy;
+
+ memoryControlSync:
+ process(clk, areset)
+ begin
+ if areset = '1' then
+ enable <= '0';
+ io_reading <= '0';
+ dram_ready <= '0';
+ elsif (clk'event and clk = '1') then
+ enable <= '1';
+ io_reading <= io_busy or io_mem_readEnable;
+ dram_ready<=dram_mem_readEnable;
+
+ end if;
+ end process;
+
+ -- wiggle the clock @ 100MHz
+ clock : PROCESS
+ begin
+ clk <= '0';
+ wait for 5 ns;
+ clk <= '1';
+ wait for 5 ns;
+ end PROCESS clock;
+
+
+end behave;
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