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//

// cpu.v -- the ECO32 CPU

//

`timescale 1ns/10ps

`default_nettype none

module cpu(clk, rst,

           bus_stb, bus_we, bus_addr,

           bus_din, bus_dout, bus_ack,

           bus_irq);

    input clk;                          // system clock

    input rst;                          // system reset

    output bus_stb;                     // bus strobe

    output bus_we;                      // bus write enable

    output [31:2] bus_addr;             // bus address (word address)

    input [31:0] bus_din;                // bus data input, for reads

    output [31:0] bus_dout;              // bus data output, for writes

    input bus_ack;                      // bus acknowledge

    input [15:0] bus_irq;                // bus interrupt requests

  wire cpu_stb;

  wire cpu_we;

  wire [1:0] cpu_size;

  wire [31:0] cpu_addr;

  wire [31:0] cpu_din;

  wire [31:0] cpu_dout;

  wire cpu_ack;

  wire [15:0] cpu_irq;

  cpu_bus cpu_bus_1(

    .clk(clk),

    .rst(rst),

    .bus_stb(bus_stb),

    .bus_we(bus_we),

    .bus_addr(bus_addr[31:2]),

    .bus_din(bus_din[31:0]),

    .bus_dout(bus_dout[31:0]),

    .bus_ack(bus_ack),

    .bus_irq(bus_irq[15:0]),

    .cpu_stb(cpu_stb),

    .cpu_we(cpu_we),

    .cpu_size(cpu_size[1:0]),

    .cpu_addr(cpu_addr[31:0]),

    .cpu_din(cpu_din[31:0]),

    .cpu_dout(cpu_dout[31:0]),

    .cpu_ack(cpu_ack),

    .cpu_irq(cpu_irq[15:0])

  );

  cpu_core cpu_core_1(

    .clk(clk),

    .rst(rst),

    .bus_stb(cpu_stb),

    .bus_we(cpu_we),

    .bus_size(cpu_size[1:0]),

    .bus_addr(cpu_addr[31:0]),

    .bus_din(cpu_din[31:0]),

    .bus_dout(cpu_dout[31:0]),

    .bus_ack(cpu_ack),

    .bus_irq(cpu_irq[15:0])

  );

endmodule