add_ff8cin.v

《数字信号处理的FPGA实现》代码

//*********************************************************
// IEEE STD 1364-1995 Verilog file: add_ff8cin.v 
// Author-EMAIL: [e-mail]
//*********************************************************
//     8 bit adder with register with cin
//`include "220model.v"

module add_ff8cin (a, b, cin, clock, s);

  input [7:0] a, b;
  input       cin, clock;
  output [7:0]    s;

  wire [7:0] r  ;  // Result adder

  wire  clkena, ADD, ena, aset, sclr, sset, aload, sload, 
                clk, aclr, ovf1, cin1; // Auxiliary signals

  assign ena=1; assign aclr=0; assign aset=0; 
  assign sclr=0;                          // Default for FF
  assign sset=0; assign aload=0; assign sload=0; 
  assign clkena=0; assign cin1=0; assign aclr=0; 
  assign ADD=1; assign clk=0;            // Default for add

 lpm_add_sub add_1                  // Add a and b
 ( .result(r), .dataa(a), .datab(b), .cin(cin)); // Used 
// .cout(cr1), .add_sub(ADD),.overflow(ovl1),   // Unused
// .clock(clk), .aclr(aclr), .clken(clkena));   // ports
   defparam add_1.lpm_width = 8;
   defparam add_1.lpm_direction = "add";


  lpm_ff reg_1          // Save a+b+cin
  ( .data(r), .q(s), .clock(clock));  // Used ports
//  .enable(ena), .aclr(aclr), .aset(aset), .sclr(sclr), 
//  .sset(sset), .aload(aload), .sload(sload)); // Unused
    defparam reg_1.lpm_width = 8;

endmodule