1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/lm32_multiplier.v Sun Apr 04 20:40:03 2010 +0100 1.3 @@ -0,0 +1,99 @@ 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