Sat, 06 Aug 2011 00:02:46 +0100
[UPSTREAM PULL] Update baseline to LatticeMico32 v3.8 from Diamond 1.3-lm32 distribution package (datestamp May 2011)
| philpem@26 | 1 | // ================================================================== |
| philpem@26 | 2 | // >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<< |
| philpem@26 | 3 | // ------------------------------------------------------------------ |
| philpem@26 | 4 | // Copyright (c) 2006-2011 by Lattice Semiconductor Corporation |
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| philpem@26 | 9 | // |
| philpem@26 | 10 | // Permission: |
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| philpem@26 | 12 | // Lattice Semiconductor grants permission to use this code |
| philpem@26 | 13 | // pursuant to the terms of the Lattice Semiconductor Corporation |
| philpem@26 | 14 | // Open Source License Agreement. |
| philpem@26 | 15 | // |
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| philpem@0 | 17 | // |
| philpem@26 | 18 | // Lattice Semiconductor provides no warranty regarding the use or |
| philpem@26 | 19 | // functionality of this code. It is the user's responsibility to |
| philpem@26 | 20 | // verify the user’s design for consistency and functionality through |
| philpem@26 | 21 | // the use of formal verification methods. |
| philpem@26 | 22 | // |
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| philpem@26 | 35 | // |
| philpem@26 | 36 | // -------------------------------------------------------------------- |
| philpem@0 | 37 | // FILE DETAILS |
| philpem@0 | 38 | // Project : LatticeMico32 |
| philpem@0 | 39 | // File : lm32_multiplier.v |
| philpem@0 | 40 | // Title : Pipelined multiplier. |
| philpem@0 | 41 | // Dependencies : lm32_include.v |
| philpem@0 | 42 | // Version : 6.1.17 |
| philpem@0 | 43 | // : Initial Release |
| philpem@0 | 44 | // Version : 7.0SP2, 3.0 |
| philpem@0 | 45 | // : No Change |
| philpem@0 | 46 | // Version : 3.1 |
| philpem@0 | 47 | // : No Change |
| philpem@0 | 48 | // ============================================================================= |
| philpem@0 | 49 | |
| philpem@0 | 50 | `include "lm32_include.v" |
| philpem@0 | 51 | |
| philpem@0 | 52 | ///////////////////////////////////////////////////// |
| philpem@0 | 53 | // Module interface |
| philpem@0 | 54 | ///////////////////////////////////////////////////// |
| philpem@0 | 55 | |
| philpem@0 | 56 | module lm32_multiplier ( |
| philpem@0 | 57 | // ----- Inputs ----- |
| philpem@0 | 58 | clk_i, |
| philpem@0 | 59 | rst_i, |
| philpem@0 | 60 | stall_x, |
| philpem@0 | 61 | stall_m, |
| philpem@0 | 62 | operand_0, |
| philpem@0 | 63 | operand_1, |
| philpem@0 | 64 | // ----- Ouputs ----- |
| philpem@0 | 65 | result |
| philpem@0 | 66 | ); |
| philpem@0 | 67 | |
| philpem@0 | 68 | ///////////////////////////////////////////////////// |
| philpem@0 | 69 | // Inputs |
| philpem@0 | 70 | ///////////////////////////////////////////////////// |
| philpem@0 | 71 | |
| philpem@0 | 72 | input clk_i; // Clock |
| philpem@0 | 73 | input rst_i; // Reset |
| philpem@0 | 74 | input stall_x; // Stall instruction in X stage |
| philpem@0 | 75 | input stall_m; // Stall instruction in M stage |
| philpem@0 | 76 | input [`LM32_WORD_RNG] operand_0; // Muliplicand |
| philpem@0 | 77 | input [`LM32_WORD_RNG] operand_1; // Multiplier |
| philpem@0 | 78 | |
| philpem@0 | 79 | ///////////////////////////////////////////////////// |
| philpem@0 | 80 | // Outputs |
| philpem@0 | 81 | ///////////////////////////////////////////////////// |
| philpem@0 | 82 | |
| philpem@0 | 83 | output [`LM32_WORD_RNG] result; // Product of multiplication |
| philpem@0 | 84 | reg [`LM32_WORD_RNG] result; |
| philpem@0 | 85 | |
| philpem@0 | 86 | ///////////////////////////////////////////////////// |
| philpem@0 | 87 | // Internal nets and registers |
| philpem@0 | 88 | ///////////////////////////////////////////////////// |
| philpem@0 | 89 | |
| philpem@0 | 90 | reg [`LM32_WORD_RNG] muliplicand; |
| philpem@0 | 91 | reg [`LM32_WORD_RNG] multiplier; |
| philpem@0 | 92 | reg [`LM32_WORD_RNG] product; |
| philpem@0 | 93 | |
| philpem@0 | 94 | ///////////////////////////////////////////////////// |
| philpem@0 | 95 | // Sequential logic |
| philpem@0 | 96 | ///////////////////////////////////////////////////// |
| philpem@0 | 97 | |
| philpem@0 | 98 | always @(posedge clk_i `CFG_RESET_SENSITIVITY) |
| philpem@0 | 99 | begin |
| philpem@0 | 100 | if (rst_i == `TRUE) |
| philpem@0 | 101 | begin |
| philpem@26 | 102 | muliplicand <= #1 {`LM32_WORD_WIDTH{1'b0}}; |
| philpem@26 | 103 | multiplier <= #1 {`LM32_WORD_WIDTH{1'b0}}; |
| philpem@26 | 104 | product <= #1 {`LM32_WORD_WIDTH{1'b0}}; |
| philpem@26 | 105 | result <= #1 {`LM32_WORD_WIDTH{1'b0}}; |
| philpem@0 | 106 | end |
| philpem@0 | 107 | else |
| philpem@0 | 108 | begin |
| philpem@0 | 109 | if (stall_x == `FALSE) |
| philpem@0 | 110 | begin |
| philpem@26 | 111 | muliplicand <= #1 operand_0; |
| philpem@26 | 112 | multiplier <= #1 operand_1; |
| philpem@0 | 113 | end |
| philpem@0 | 114 | if (stall_m == `FALSE) |
| philpem@26 | 115 | product <= #1 muliplicand * multiplier; |
| philpem@26 | 116 | result <= #1 product; |
| philpem@0 | 117 | end |
| philpem@0 | 118 | end |
| philpem@0 | 119 | |
| philpem@0 | 120 | endmodule |