`timescale 1ns/1ps

 module cpu_top;

   wire reset,load_acc,load_ir,load_pc,halt,zero;
   wire clock,clk2,alu_clock,fetch,inc_pc;
   wire[15:0] alu_out,acc,data,opcode_iraddr;
   wire[12:0] addr,ir_addr,pc_addr;
   wire[2:0] opcode;
   assign {opcode,ir_addr}=opcode_iraddr;
   cpu_register accumulator(accum,clock,alu_out,load_acc,reset);
   cpu_alu alu(alu_out,zero,opcode,data,accum,alu_clock);
   cpu_datactrl  data_ctrl(data,alu_out,fetch,mem_r,clk2);
   cpu_mem mem(data,addr,mem_r,mem_w);
   cpu_register instr_register(opcode_iraddr,clock,data,load_ir,reset);
   cpu_sctrl state_ctrl(load_acc,mem_r,mem_w,inc_pc,load_pc,load_ir,halt,opcode,fetch,zero,clock,clk2,reset);
   cpu_pcounter program_counter(pc_addr,inc_pc,ir_addr,reset,load_pc);
   cpu_admux address_mux(addr,pc_addr,ir_addr,fetch);
   cpu_clkg clock_g(fetch,clk2,clk,alu_clock);
 endmodule