IPCores/lm32_cpu / file diff

     1.1 --- a/lm32_multiplier.v	Sun Mar 06 21:17:31 2011 +0000
     1.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.3 @@ -1,99 +0,0 @@
     1.4 -// =============================================================================
     1.5 -//                           COPYRIGHT NOTICE
     1.6 -// Copyright 2006 (c) Lattice Semiconductor Corporation
     1.7 -// ALL RIGHTS RESERVED
     1.8 -// This confidential and proprietary software may be used only as authorised by
     1.9 -// a licensing agreement from Lattice Semiconductor Corporation.
    1.10 -// The entire notice above must be reproduced on all authorized copies and
    1.11 -// copies may only be made to the extent permitted by a licensing agreement from
    1.12 -// Lattice Semiconductor Corporation.
    1.13 -//
    1.14 -// Lattice Semiconductor Corporation        TEL : 1-800-Lattice (USA and Canada)
    1.15 -// 5555 NE Moore Court                            408-826-6000 (other locations)
    1.16 -// Hillsboro, OR 97124                     web  : http://www.latticesemi.com/
    1.17 -// U.S.A                                   email: techsupport@latticesemi.com
    1.18 -// =============================================================================/
    1.19 -//                         FILE DETAILS
    1.20 -// Project          : LatticeMico32
    1.21 -// File             : lm32_multiplier.v
    1.22 -// Title            : Pipelined multiplier.
    1.23 -// Dependencies     : lm32_include.v
    1.24 -// Version          : 6.1.17
    1.25 -//                  : Initial Release
    1.26 -// Version          : 7.0SP2, 3.0
    1.27 -//                  : No Change
    1.28 -// Version          : 3.1
    1.29 -//                  : No Change
    1.30 -// =============================================================================
    1.31 -                  
    1.32 -`include "lm32_include.v"
    1.33 -
    1.34 -/////////////////////////////////////////////////////
    1.35 -// Module interface
    1.36 -/////////////////////////////////////////////////////
    1.37 -
    1.38 -module lm32_multiplier (
    1.39 -    // ----- Inputs -----
    1.40 -    clk_i,
    1.41 -    rst_i,
    1.42 -    stall_x,
    1.43 -    stall_m,
    1.44 -    operand_0,
    1.45 -    operand_1,
    1.46 -    // ----- Ouputs -----
    1.47 -    result
    1.48 -    );
    1.49 -
    1.50 -/////////////////////////////////////////////////////
    1.51 -// Inputs
    1.52 -/////////////////////////////////////////////////////
    1.53 -
    1.54 -input clk_i;                            // Clock 
    1.55 -input rst_i;                            // Reset
    1.56 -input stall_x;                          // Stall instruction in X stage
    1.57 -input stall_m;                          // Stall instruction in M stage
    1.58 -input [`LM32_WORD_RNG] operand_0;     	// Muliplicand
    1.59 -input [`LM32_WORD_RNG] operand_1;     	// Multiplier
    1.60 -
    1.61 -/////////////////////////////////////////////////////
    1.62 -// Outputs
    1.63 -/////////////////////////////////////////////////////
    1.64 -
    1.65 -output [`LM32_WORD_RNG] result;       	// Product of multiplication
    1.66 -reg    [`LM32_WORD_RNG] result;
    1.67 -
    1.68 -/////////////////////////////////////////////////////
    1.69 -// Internal nets and registers 
    1.70 -/////////////////////////////////////////////////////
    1.71 -
    1.72 -reg [`LM32_WORD_RNG] muliplicand; 
    1.73 -reg [`LM32_WORD_RNG] multiplier; 
    1.74 -reg [`LM32_WORD_RNG] product; 
    1.75 -
    1.76 -/////////////////////////////////////////////////////
    1.77 -// Sequential logic
    1.78 -/////////////////////////////////////////////////////
    1.79 -
    1.80 -always @(posedge clk_i `CFG_RESET_SENSITIVITY)
    1.81 -begin
    1.82 -    if (rst_i == `TRUE)
    1.83 -    begin
    1.84 -        muliplicand <= {`LM32_WORD_WIDTH{1'b0}};
    1.85 -        multiplier <= {`LM32_WORD_WIDTH{1'b0}};
    1.86 -        product <= {`LM32_WORD_WIDTH{1'b0}};
    1.87 -        result <= {`LM32_WORD_WIDTH{1'b0}};
    1.88 -    end
    1.89 -    else
    1.90 -    begin
    1.91 -        if (stall_x == `FALSE)
    1.92 -        begin    
    1.93 -            muliplicand <= operand_0;
    1.94 -            multiplier <= operand_1;
    1.95 -        end
    1.96 -        if (stall_m == `FALSE)
    1.97 -            product <= muliplicand * multiplier;
    1.98 -        result <= product;
    1.99 -    end
   1.100 -end
   1.101 -
   1.102 -endmodule