rom 개념을 이용한 ∑Ai*Bi  두 데이터의 곱셈.
A값 10개와 B값 10개를 dat파일에서 읽어온다. 첨부파일이 work space를 참고할 것.

<hw.v>
module hw7 (
clock , // Clock input of the design
reset , // active high, synchronous Reset input
enable, enable2, wen, // Active high enable signal for counter
reg_a, reg_b,  // rom에서 받아올 port
mult_cnt, mult_sum_cnt, // 곱셈 용 카운터, ∑용 카운터
mult, mult_sum,  //곱하기용
dis_cnt
); // End of port list
//-------------Parameters-----------------------------
parameter depth = 10;
parameter width = 16;
parameter cnt_bit = 4; // 카운터 비트수, 자료량에 따라 결정 됨. log_2[자료량]의 정수화 올림 -> 엑셀 수식 :ROUNDUP(LOG(10,2),0)
//-------------Input Ports-----------------------------
input clock ;
input reset ;
input enable, enable2, wen ; // enable용
input [width-1:0]reg_a ;         //rommemb에서 받아올 포트
input [width-1:0]reg_b ;         //rommemb에서 받아올 포트
input dis_cnt;              //rommemb에서 받아올 포트
//-------------Output Ports----------------------------
output [cnt_bit-1:0] mult_cnt;
output [cnt_bit-1:0] mult_sum_cnt;
output [width*2-1:0] mult;      // 곱한 값
output [width*2+cnt_bit:0] mult_sum; // 곱해서 더한 값
//-------------Input ports Data Type-------------------
// By rule all the input ports should be wires
wire clock ;
wire reset ;
wire enable, enable2, wen ;
wire [width-1:0]reg_a;
wire [width-1:0]reg_b;
wire [cnt_bit-1:0]dis_cnt;
//-------------Output Ports Data Type------------------
// Output port can be a storage element (reg) or a wire
reg [cnt_bit-1:0] mult_cnt;
reg [cnt_bit-1:0] mult_sum_cnt;
reg [width*2-1:0] mult;
reg [width*2-1:0] mult_list[15:0]; // 곱한 값 저장
reg [width*2+cnt_bit:0] mult_sum;       // 곱한 것을 모두 더한 reg

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

always @ (posedge clock)
begin : resetting // Block Name
  if (reset == 1) begin//
    mult_cnt = 0;
    mult_sum_cnt=0;
    mult = 0;
    mult_sum = 0;
  end
end       // reset

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

always @ (clock)
begin : multiple // Block Name
  if (enable == 1) begin//
        mult_list[dis_cnt] <= reg_a * reg_b;
  end
end       // multiplication

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

always @ (posedge clock)
begin : mult_store // Block Name
  if (enable2 == 1 && mult_cnt < depth) begin//
        mult <= mult_list[mult_cnt];
        mult_cnt <= mult_cnt+1;
        mult_sum_cnt <= mult_cnt;
  end
end       // mult_store

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

always @ (posedge clock)
begin : SOSOMR // Block Name
  if (wen == 1) begin//
        mult_sum <= mult_list[mult_sum_cnt] + mult_sum;
        end
end       // Sum of Storing of muliplication results.

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
endmodule
<rommemb.v>
module rom_memb(
clock, reset,
reg_a, reg_b, dis_cnt
);
parameter width = 16;
parameter depth = 10;

input clock, reset;
output [width-1:0]reg_a ;         //rommemb에서 받아올 포트
output [width-1:0]reg_b ;         //rommemb에서 받아올 포트
output [3:0]dis_cnt;              //rommemb에서 받아올 포트

reg [3:0] romcounter;
reg [3:0] dis_cnt;
reg [width-1:0] reg_av [depth-1:0];  //dat를 저장할 reg
reg [width-1:0] reg_bv [depth-1:0];  //dat를 저장할 reg
reg [width-1:0] reg_a, reg_b;             //input port로 넘겨줄 reg

wire clock;

integer i;

always @ (posedge clock) begin
if(reset==1) begin
     romcounter =0;
     $readmemb("reg_av.dat", reg_av);
     $readmemb("reg_bv.dat", reg_bv);
     for(i=0; i<depth; i=i+1) begin
        $display("reg_av [%0d] = %b", i, reg_av[i]);
        $display("reg_bv [%0d] = %b", i, reg_bv[i]);
        end   // for end
     end      // if_reset end
end           // always end

always @ (posedge clock) begin
    if(romcounter<4'b1010) begin
    reg_a <= reg_av[romcounter];
    reg_b <= reg_bv[romcounter];
    romcounter <= romcounter+1;
    dis_cnt <= romcounter;
    end
    end

endmodule
<rom_memb_tb.v>
module rom_memb_tb;

parameter depth = 10;
parameter width = 16;

reg clock, reset, enable, enable2, wen;
wire [15:0] reg_a;
wire [15:0] reg_b;
wire [3:0] dis_cnt;

initial begin
  clock = 1;
  reset = 0;
  enable = 0;
  enable2 = 0;
  wen = 0;
  #5reset = 1;    // Assert the reset
  #50 reset = 0;   // De-assert the reset
  enable = 1;      // Teading of rom's data(RORSD)
  #50 enable2 =1;  // Storing of mulitplication results(SOMR)
  #50 wen = 1;      // Sum of SOMR
  #450 enable = 0; // Terminate RORSD
  #50 enable2 =0;  // Terminate SOMR
  wen = 0;      // Terminate SOSOMR
  #50 $finish;      // Terminate simulation
end

always begin
  #25 clock = ~clock; // Toggle clock every 25 ticks 25Mhz
end

rom_memb
 #(
  .depth(10),
  .width(16))
 rom (
  .clock(clock),
  .reset(reset),
  .reg_a(reg_a),
  .reg_b(reg_b),
  .dis_cnt(dis_cnt));

hw7
 hw7 (
  .clock(clock),
  .reset(reset),
  .enable(enable),
  .enable2(enable2),
  .wen(wen),
  .reg_a(reg_a),
  .reg_b(reg_b),
  .dis_cnt(dis_cnt)
  );

endmodule