Subversion Repositories xucpu

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
USE work.S2LIB.ALL;
 
ENTITY S2 IS
 
  PORT (
    CLOCK  : IN  STD_LOGIC;
    RESET  : IN  STD_LOGIC;
    LED    : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
    SWITCH : IN  STD_LOGIC_VECTOR(7 DOWNTO 0);
    BUTTON : IN  STD_LOGIC_VECTOR(4 DOWNTO 0));
 
END ENTITY S2;
 
ARCHITECTURE Structural OF S2 IS
 
  SIGNAL CLK : STD_LOGIC;
  SIGNAL RST : STD_LOGIC;
 
  SIGNAL DATA_BUS    : STD_LOGIC_VECTOR(15 DOWNTO 0);
  SIGNAL ADDRESS_BUS : STD_LOGIC_VECTOR(14 DOWNTO 0);
  SIGNAL RD          : STD_LOGIC;
  SIGNAL WR          : STD_LOGIC;
 
  SIGNAL BA_ADDR_SEL : STD_LOGIC;
  SIGNAL BA_ICC_ACK  : STD_LOGIC;
  SIGNAL BA_DCC_ACK  : STD_LOGIC;
 
  SIGNAL ICC_RD      : STD_LOGIC;
  SIGNAL ICC_WR      : STD_LOGIC;
  SIGNAL ICC_ADDRESS : STD_LOGIC_VECTOR(14 DOWNTO 0);
  SIGNAL ICC_DATA    : STD_LOGIC_VECTOR(15 DOWNTO 0);
  SIGNAL DCC_RD      : STD_LOGIC;
  SIGNAL DCC_WR      : STD_LOGIC;
  SIGNAL DCC_ADDRESS : STD_LOGIC_VECTOR(14 DOWNTO 0);
  SIGNAL DCC_DATA    : STD_LOGIC_VECTOR(15 DOWNTO 0);
 
  SIGNAL CPU_IF          : STD_LOGIC;
  SIGNAL CPU_INSTR_ADDR  : STD_LOGIC_VECTOR(14 DOWNTO 0);
  SIGNAL CPU_INSTRUCTION : STD_LOGIC_VECTOR(15 DOWNTO 0);
 
  SIGNAL CPU_RD        : STD_LOGIC;
  SIGNAL CPU_WR        : STD_LOGIC;
  SIGNAL CPU_DATA_ADDR : STD_LOGIC_VECTOR(14 DOWNTO 0);
  SIGNAL CPU_DATA_OUT  : STD_LOGIC_VECTOR(15 DOWNTO 0);
  SIGNAL CPU_DATA_IN   : STD_LOGIC_VECTOR(15 DOWNTO 0);
 
  SIGNAL MEM_DATA : STD_LOGIC_VECTOR(15 DOWNTO 0);
 
BEGIN  -- ARCHITECTURE Structural
 
  BA1 : S2ARB
    PORT MAP (
      -- Main component connections
      CLK               => CLK,
      RST               => RST,
      -- Bus requests from ICC
      I_RD_ICC          => ICC_RD,
      I_WR_ICC          => ICC_WR,
      -- Bus requests from DCC
      I_RD_DCC          => DCC_RD,
      I_WR_DCC          => DCC_WR,
      -- Arbiter control signals
      O_ADDRESS_MUX_SEL => BA_ADDR_SEL,
      O_ACK_ICC         => BA_ICC_ACK,
      O_ACK_DCC         => BA_DCC_ACK);
 
 
  ICC1 : S2ICC
    PORT MAP (
      -- Main component connections
      CLK               => CLK,
      RST               => RST,
      -- To main bus
      O_ADDRESS         => ICC_ADDRESS,
      O_DATA            => ICC_DATA,
      O_RD              => ICC_RD,
      O_WR              => ICC_WR,
      -- From bus arbiter
      I_ACK             => BA_ICC_ACK,
      -- From main bus
      I_ADDRESS         => ADDRESS_BUS,
      I_DATA            => DATA_BUS,
      I_RD              => RD,
      I_WR              => WR,
      -- CPU specific connections
      I_CPU_IF          => CPU_IF,
      I_CPU_INSTR_ADDR  => CPU_INSTR_ADDR,
      O_CPU_INSTRUCTION => CPU_INSTRUCTION);
 
  DCC1 : S2DCC
    PORT MAP (
      -- Main component connections
      CLK             => CLK,
      RST             => RST,
      -- To main bus
      O_ADDRESS       => DCC_ADDRESS,
      O_DATA          => DCC_DATA,
      O_RD            => DCC_RD,
      O_WR            => DCC_WR,
      -- From bus arbiter
      I_ACK           => BA_DCC_ACK,
      -- From main bus
      I_ADDRESS       => ADDRESS_BUS,
      I_DATA          => DATA_BUS,
      I_RD            => RD,
      I_WR            => WR,
      -- CPU specific connections
      I_CPU_RD        => CPU_RD,
      I_CPU_WR        => CPU_WR,
      I_CPU_DATA_ADDR => CPU_DATA_ADDR,
      I_CPU_DATA      => CPU_DATA_OUT,
      O_CPU_DATA      => CPU_DATA_IN);
 
  CPU1 : S2CPU
    PORT MAP (
      -- Main component connections
      CLK           => CLK,
      RST           => RST,
      -- Instruction cache connections
      O_IF          => CPU_IF,
      O_INSTR_ADDR  => CPU_INSTR_ADDR,
      I_INSTRUCTION => CPU_INSTRUCTION,
      -- Data cache connections
      O_RD          => CPU_RD,
      O_WR          => CPU_WR,
      O_DATA_ADDR   => CPU_DATA_ADDR,
      O_DATA        => CPU_DATA_OUT,
      I_DATA        => CPU_DATA_IN);
 
  MEM1 : S2MEM
    PORT MAP (
      CLK       => CLK,
      RST       => RST,
      I_RD      => RD,
      I_WR      => WR,
      I_ADDRESS => ADDRESS_BUS,
      I_DATA    => DATA_BUS,
      O_DATA    => MEM_DATA);
 
 
 
 
 
END ARCHITECTURE Structural;