IPCores/lm32_cpu / file diff

     1.1 diff -r 252df75c8f67 -r c336e674a37e rtl/lm32_multiplier.v
     1.2 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.3 +++ b/rtl/lm32_multiplier.v	Tue Mar 08 09:40:42 2011 +0000
     1.4 @@ -0,0 +1,99 @@
     1.5 +// =============================================================================
     1.6 +//                           COPYRIGHT NOTICE
     1.7 +// Copyright 2006 (c) Lattice Semiconductor Corporation
     1.8 +// ALL RIGHTS RESERVED
     1.9 +// This confidential and proprietary software may be used only as authorised by
    1.10 +// a licensing agreement from Lattice Semiconductor Corporation.
    1.11 +// The entire notice above must be reproduced on all authorized copies and
    1.12 +// copies may only be made to the extent permitted by a licensing agreement from
    1.13 +// Lattice Semiconductor Corporation.
    1.14 +//
    1.15 +// Lattice Semiconductor Corporation        TEL : 1-800-Lattice (USA and Canada)
    1.16 +// 5555 NE Moore Court                            408-826-6000 (other locations)
    1.17 +// Hillsboro, OR 97124                     web  : http://www.latticesemi.com/
    1.18 +// U.S.A                                   email: techsupport@latticesemi.com
    1.19 +// =============================================================================/
    1.20 +//                         FILE DETAILS
    1.21 +// Project          : LatticeMico32
    1.22 +// File             : lm32_multiplier.v
    1.23 +// Title            : Pipelined multiplier.
    1.24 +// Dependencies     : lm32_include.v
    1.25 +// Version          : 6.1.17
    1.26 +//                  : Initial Release
    1.27 +// Version          : 7.0SP2, 3.0
    1.28 +//                  : No Change
    1.29 +// Version          : 3.1
    1.30 +//                  : No Change
    1.31 +// =============================================================================
    1.32 +                  
    1.33 +`include "lm32_include.v"
    1.34 +
    1.35 +/////////////////////////////////////////////////////
    1.36 +// Module interface
    1.37 +/////////////////////////////////////////////////////
    1.38 +
    1.39 +module lm32_multiplier (
    1.40 +    // ----- Inputs -----
    1.41 +    clk_i,
    1.42 +    rst_i,
    1.43 +    stall_x,
    1.44 +    stall_m,
    1.45 +    operand_0,
    1.46 +    operand_1,
    1.47 +    // ----- Ouputs -----
    1.48 +    result
    1.49 +    );
    1.50 +
    1.51 +/////////////////////////////////////////////////////
    1.52 +// Inputs
    1.53 +/////////////////////////////////////////////////////
    1.54 +
    1.55 +input clk_i;                            // Clock 
    1.56 +input rst_i;                            // Reset
    1.57 +input stall_x;                          // Stall instruction in X stage
    1.58 +input stall_m;                          // Stall instruction in M stage
    1.59 +input [`LM32_WORD_RNG] operand_0;     	// Muliplicand
    1.60 +input [`LM32_WORD_RNG] operand_1;     	// Multiplier
    1.61 +
    1.62 +/////////////////////////////////////////////////////
    1.63 +// Outputs
    1.64 +/////////////////////////////////////////////////////
    1.65 +
    1.66 +output [`LM32_WORD_RNG] result;       	// Product of multiplication
    1.67 +reg    [`LM32_WORD_RNG] result;
    1.68 +
    1.69 +/////////////////////////////////////////////////////
    1.70 +// Internal nets and registers 
    1.71 +/////////////////////////////////////////////////////
    1.72 +
    1.73 +reg [`LM32_WORD_RNG] muliplicand; 
    1.74 +reg [`LM32_WORD_RNG] multiplier; 
    1.75 +reg [`LM32_WORD_RNG] product; 
    1.76 +
    1.77 +/////////////////////////////////////////////////////
    1.78 +// Sequential logic
    1.79 +/////////////////////////////////////////////////////
    1.80 +
    1.81 +always @(posedge clk_i `CFG_RESET_SENSITIVITY)
    1.82 +begin
    1.83 +    if (rst_i == `TRUE)
    1.84 +    begin
    1.85 +        muliplicand <= {`LM32_WORD_WIDTH{1'b0}};
    1.86 +        multiplier <= {`LM32_WORD_WIDTH{1'b0}};
    1.87 +        product <= {`LM32_WORD_WIDTH{1'b0}};
    1.88 +        result <= {`LM32_WORD_WIDTH{1'b0}};
    1.89 +    end
    1.90 +    else
    1.91 +    begin
    1.92 +        if (stall_x == `FALSE)
    1.93 +        begin    
    1.94 +            muliplicand <= operand_0;
    1.95 +            multiplier <= operand_1;
    1.96 +        end
    1.97 +        if (stall_m == `FALSE)
    1.98 +            product <= muliplicand * multiplier;
    1.99 +        result <= product;
   1.100 +    end
   1.101 +end
   1.102 +
   1.103 +endmodule