1.1 --- a/lm32_decoder.v Sun Mar 06 21:17:31 2011 +0000 1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 1.3 @@ -1,583 +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_decoder.v 1.22 -// Title : Instruction decoder 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 -// : Support for static branch prediction. Information about 1.30 -// : branch type is generated and passed on to the predictor. 1.31 -// Version : 3.2 1.32 -// : No change 1.33 -// Version : 3.3 1.34 -// : Renamed port names that conflict with keywords reserved 1.35 -// : in System-Verilog. 1.36 -// ============================================================================= 1.37 - 1.38 -`include "lm32_include.v" 1.39 - 1.40 -// Index of opcode field in an instruction 1.41 -`define LM32_OPCODE_RNG 31:26 1.42 -`define LM32_OP_RNG 30:26 1.43 - 1.44 -// Opcodes - Some are only listed as 5 bits as their MSB is a don't care 1.45 -`define LM32_OPCODE_ADD 5'b01101 1.46 -`define LM32_OPCODE_AND 5'b01000 1.47 -`define LM32_OPCODE_ANDHI 6'b011000 1.48 -`define LM32_OPCODE_B 6'b110000 1.49 -`define LM32_OPCODE_BI 6'b111000 1.50 -`define LM32_OPCODE_BE 6'b010001 1.51 -`define LM32_OPCODE_BG 6'b010010 1.52 -`define LM32_OPCODE_BGE 6'b010011 1.53 -`define LM32_OPCODE_BGEU 6'b010100 1.54 -`define LM32_OPCODE_BGU 6'b010101 1.55 -`define LM32_OPCODE_BNE 6'b010111 1.56 -`define LM32_OPCODE_CALL 6'b110110 1.57 -`define LM32_OPCODE_CALLI 6'b111110 1.58 -`define LM32_OPCODE_CMPE 5'b11001 1.59 -`define LM32_OPCODE_CMPG 5'b11010 1.60 -`define LM32_OPCODE_CMPGE 5'b11011 1.61 -`define LM32_OPCODE_CMPGEU 5'b11100 1.62 -`define LM32_OPCODE_CMPGU 5'b11101 1.63 -`define LM32_OPCODE_CMPNE 5'b11111 1.64 -`define LM32_OPCODE_DIVU 6'b100011 1.65 -`define LM32_OPCODE_LB 6'b000100 1.66 -`define LM32_OPCODE_LBU 6'b010000 1.67 -`define LM32_OPCODE_LH 6'b000111 1.68 -`define LM32_OPCODE_LHU 6'b001011 1.69 -`define LM32_OPCODE_LW 6'b001010 1.70 -`define LM32_OPCODE_MODU 6'b110001 1.71 -`define LM32_OPCODE_MUL 5'b00010 1.72 -`define LM32_OPCODE_NOR 5'b00001 1.73 -`define LM32_OPCODE_OR 5'b01110 1.74 -`define LM32_OPCODE_ORHI 6'b011110 1.75 -`define LM32_OPCODE_RAISE 6'b101011 1.76 -`define LM32_OPCODE_RCSR 6'b100100 1.77 -`define LM32_OPCODE_SB 6'b001100 1.78 -`define LM32_OPCODE_SEXTB 6'b101100 1.79 -`define LM32_OPCODE_SEXTH 6'b110111 1.80 -`define LM32_OPCODE_SH 6'b000011 1.81 -`define LM32_OPCODE_SL 5'b01111 1.82 -`define LM32_OPCODE_SR 5'b00101 1.83 -`define LM32_OPCODE_SRU 5'b00000 1.84 -`define LM32_OPCODE_SUB 6'b110010 1.85 -`define LM32_OPCODE_SW 6'b010110 1.86 -`define LM32_OPCODE_USER 6'b110011 1.87 -`define LM32_OPCODE_WCSR 6'b110100 1.88 -`define LM32_OPCODE_XNOR 5'b01001 1.89 -`define LM32_OPCODE_XOR 5'b00110 1.90 - 1.91 -///////////////////////////////////////////////////// 1.92 -// Module interface 1.93 -///////////////////////////////////////////////////// 1.94 - 1.95 -module lm32_decoder ( 1.96 - // ----- Inputs ------- 1.97 - instruction, 1.98 - // ----- Outputs ------- 1.99 - d_result_sel_0, 1.100 - d_result_sel_1, 1.101 - x_result_sel_csr, 1.102 -`ifdef LM32_MC_ARITHMETIC_ENABLED 1.103 - x_result_sel_mc_arith, 1.104 -`endif 1.105 -`ifdef LM32_NO_BARREL_SHIFT 1.106 - x_result_sel_shift, 1.107 -`endif 1.108 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.109 - x_result_sel_sext, 1.110 -`endif 1.111 - x_result_sel_logic, 1.112 -`ifdef CFG_USER_ENABLED 1.113 - x_result_sel_user, 1.114 -`endif 1.115 - x_result_sel_add, 1.116 - m_result_sel_compare, 1.117 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.118 - m_result_sel_shift, 1.119 -`endif 1.120 - w_result_sel_load, 1.121 -`ifdef CFG_PL_MULTIPLY_ENABLED 1.122 - w_result_sel_mul, 1.123 -`endif 1.124 - x_bypass_enable, 1.125 - m_bypass_enable, 1.126 - read_enable_0, 1.127 - read_idx_0, 1.128 - read_enable_1, 1.129 - read_idx_1, 1.130 - write_enable, 1.131 - write_idx, 1.132 - immediate, 1.133 - branch_offset, 1.134 - load, 1.135 - store, 1.136 - size, 1.137 - sign_extend, 1.138 - adder_op, 1.139 - logic_op, 1.140 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.141 - direction, 1.142 -`endif 1.143 -`ifdef CFG_MC_BARREL_SHIFT_ENABLED 1.144 - shift_left, 1.145 - shift_right, 1.146 -`endif 1.147 -`ifdef CFG_MC_MULTIPLY_ENABLED 1.148 - multiply, 1.149 -`endif 1.150 -`ifdef CFG_MC_DIVIDE_ENABLED 1.151 - divide, 1.152 - modulus, 1.153 -`endif 1.154 - branch, 1.155 - branch_reg, 1.156 - condition, 1.157 - bi_conditional, 1.158 - bi_unconditional, 1.159 -`ifdef CFG_DEBUG_ENABLED 1.160 - break_opcode, 1.161 -`endif 1.162 - scall, 1.163 - eret, 1.164 -`ifdef CFG_DEBUG_ENABLED 1.165 - bret, 1.166 -`endif 1.167 -`ifdef CFG_USER_ENABLED 1.168 - user_opcode, 1.169 -`endif 1.170 - csr_write_enable 1.171 - ); 1.172 - 1.173 -///////////////////////////////////////////////////// 1.174 -// Inputs 1.175 -///////////////////////////////////////////////////// 1.176 - 1.177 -input [`LM32_INSTRUCTION_RNG] instruction; // Instruction to decode 1.178 - 1.179 -///////////////////////////////////////////////////// 1.180 -// Outputs 1.181 -///////////////////////////////////////////////////// 1.182 - 1.183 -output [`LM32_D_RESULT_SEL_0_RNG] d_result_sel_0; 1.184 -reg [`LM32_D_RESULT_SEL_0_RNG] d_result_sel_0; 1.185 -output [`LM32_D_RESULT_SEL_1_RNG] d_result_sel_1; 1.186 -reg [`LM32_D_RESULT_SEL_1_RNG] d_result_sel_1; 1.187 -output x_result_sel_csr; 1.188 -reg x_result_sel_csr; 1.189 -`ifdef LM32_MC_ARITHMETIC_ENABLED 1.190 -output x_result_sel_mc_arith; 1.191 -reg x_result_sel_mc_arith; 1.192 -`endif 1.193 -`ifdef LM32_NO_BARREL_SHIFT 1.194 -output x_result_sel_shift; 1.195 -reg x_result_sel_shift; 1.196 -`endif 1.197 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.198 -output x_result_sel_sext; 1.199 -reg x_result_sel_sext; 1.200 -`endif 1.201 -output x_result_sel_logic; 1.202 -reg x_result_sel_logic; 1.203 -`ifdef CFG_USER_ENABLED 1.204 -output x_result_sel_user; 1.205 -reg x_result_sel_user; 1.206 -`endif 1.207 -output x_result_sel_add; 1.208 -reg x_result_sel_add; 1.209 -output m_result_sel_compare; 1.210 -reg m_result_sel_compare; 1.211 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.212 -output m_result_sel_shift; 1.213 -reg m_result_sel_shift; 1.214 -`endif 1.215 -output w_result_sel_load; 1.216 -reg w_result_sel_load; 1.217 -`ifdef CFG_PL_MULTIPLY_ENABLED 1.218 -output w_result_sel_mul; 1.219 -reg w_result_sel_mul; 1.220 -`endif 1.221 -output x_bypass_enable; 1.222 -wire x_bypass_enable; 1.223 -output m_bypass_enable; 1.224 -wire m_bypass_enable; 1.225 -output read_enable_0; 1.226 -wire read_enable_0; 1.227 -output [`LM32_REG_IDX_RNG] read_idx_0; 1.228 -wire [`LM32_REG_IDX_RNG] read_idx_0; 1.229 -output read_enable_1; 1.230 -wire read_enable_1; 1.231 -output [`LM32_REG_IDX_RNG] read_idx_1; 1.232 -wire [`LM32_REG_IDX_RNG] read_idx_1; 1.233 -output write_enable; 1.234 -wire write_enable; 1.235 -output [`LM32_REG_IDX_RNG] write_idx; 1.236 -wire [`LM32_REG_IDX_RNG] write_idx; 1.237 -output [`LM32_WORD_RNG] immediate; 1.238 -wire [`LM32_WORD_RNG] immediate; 1.239 -output [`LM32_PC_RNG] branch_offset; 1.240 -wire [`LM32_PC_RNG] branch_offset; 1.241 -output load; 1.242 -wire load; 1.243 -output store; 1.244 -wire store; 1.245 -output [`LM32_SIZE_RNG] size; 1.246 -wire [`LM32_SIZE_RNG] size; 1.247 -output sign_extend; 1.248 -wire sign_extend; 1.249 -output adder_op; 1.250 -wire adder_op; 1.251 -output [`LM32_LOGIC_OP_RNG] logic_op; 1.252 -wire [`LM32_LOGIC_OP_RNG] logic_op; 1.253 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.254 -output direction; 1.255 -wire direction; 1.256 -`endif 1.257 -`ifdef CFG_MC_BARREL_SHIFT_ENABLED 1.258 -output shift_left; 1.259 -wire shift_left; 1.260 -output shift_right; 1.261 -wire shift_right; 1.262 -`endif 1.263 -`ifdef CFG_MC_MULTIPLY_ENABLED 1.264 -output multiply; 1.265 -wire multiply; 1.266 -`endif 1.267 -`ifdef CFG_MC_DIVIDE_ENABLED 1.268 -output divide; 1.269 -wire divide; 1.270 -output modulus; 1.271 -wire modulus; 1.272 -`endif 1.273 -output branch; 1.274 -wire branch; 1.275 -output branch_reg; 1.276 -wire branch_reg; 1.277 -output [`LM32_CONDITION_RNG] condition; 1.278 -wire [`LM32_CONDITION_RNG] condition; 1.279 -output bi_conditional; 1.280 -wire bi_conditional; 1.281 -output bi_unconditional; 1.282 -wire bi_unconditional; 1.283 -`ifdef CFG_DEBUG_ENABLED 1.284 -output break_opcode; 1.285 -wire break_opcode; 1.286 -`endif 1.287 -output scall; 1.288 -wire scall; 1.289 -output eret; 1.290 -wire eret; 1.291 -`ifdef CFG_DEBUG_ENABLED 1.292 -output bret; 1.293 -wire bret; 1.294 -`endif 1.295 -`ifdef CFG_USER_ENABLED 1.296 -output [`LM32_USER_OPCODE_RNG] user_opcode; 1.297 -wire [`LM32_USER_OPCODE_RNG] user_opcode; 1.298 -`endif 1.299 -output csr_write_enable; 1.300 -wire csr_write_enable; 1.301 - 1.302 -///////////////////////////////////////////////////// 1.303 -// Internal nets and registers 1.304 -///////////////////////////////////////////////////// 1.305 - 1.306 -wire [`LM32_WORD_RNG] extended_immediate; // Zero or sign extended immediate 1.307 -wire [`LM32_WORD_RNG] high_immediate; // Immediate as high 16 bits 1.308 -wire [`LM32_WORD_RNG] call_immediate; // Call immediate 1.309 -wire [`LM32_WORD_RNG] branch_immediate; // Conditional branch immediate 1.310 -wire sign_extend_immediate; // Whether the immediate should be sign extended (`TRUE) or zero extended (`FALSE) 1.311 -wire select_high_immediate; // Whether to select the high immediate 1.312 -wire select_call_immediate; // Whether to select the call immediate 1.313 - 1.314 -///////////////////////////////////////////////////// 1.315 -// Functions 1.316 -///////////////////////////////////////////////////// 1.317 - 1.318 -`include "lm32_functions.v" 1.319 - 1.320 -///////////////////////////////////////////////////// 1.321 -// Combinational logic 1.322 -///////////////////////////////////////////////////// 1.323 - 1.324 -// Determine opcode 1.325 -assign op_add = instruction[`LM32_OP_RNG] == `LM32_OPCODE_ADD; 1.326 -assign op_and = instruction[`LM32_OP_RNG] == `LM32_OPCODE_AND; 1.327 -assign op_andhi = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_ANDHI; 1.328 -assign op_b = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_B; 1.329 -assign op_bi = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BI; 1.330 -assign op_be = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BE; 1.331 -assign op_bg = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BG; 1.332 -assign op_bge = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BGE; 1.333 -assign op_bgeu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BGEU; 1.334 -assign op_bgu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BGU; 1.335 -assign op_bne = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_BNE; 1.336 -assign op_call = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_CALL; 1.337 -assign op_calli = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_CALLI; 1.338 -assign op_cmpe = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPE; 1.339 -assign op_cmpg = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPG; 1.340 -assign op_cmpge = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPGE; 1.341 -assign op_cmpgeu = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPGEU; 1.342 -assign op_cmpgu = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPGU; 1.343 -assign op_cmpne = instruction[`LM32_OP_RNG] == `LM32_OPCODE_CMPNE; 1.344 -`ifdef CFG_MC_DIVIDE_ENABLED 1.345 -assign op_divu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_DIVU; 1.346 -`endif 1.347 -assign op_lb = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_LB; 1.348 -assign op_lbu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_LBU; 1.349 -assign op_lh = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_LH; 1.350 -assign op_lhu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_LHU; 1.351 -assign op_lw = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_LW; 1.352 -`ifdef CFG_MC_DIVIDE_ENABLED 1.353 -assign op_modu = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_MODU; 1.354 -`endif 1.355 -`ifdef LM32_MULTIPLY_ENABLED 1.356 -assign op_mul = instruction[`LM32_OP_RNG] == `LM32_OPCODE_MUL; 1.357 -`endif 1.358 -assign op_nor = instruction[`LM32_OP_RNG] == `LM32_OPCODE_NOR; 1.359 -assign op_or = instruction[`LM32_OP_RNG] == `LM32_OPCODE_OR; 1.360 -assign op_orhi = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_ORHI; 1.361 -assign op_raise = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_RAISE; 1.362 -assign op_rcsr = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_RCSR; 1.363 -assign op_sb = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SB; 1.364 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.365 -assign op_sextb = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SEXTB; 1.366 -assign op_sexth = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SEXTH; 1.367 -`endif 1.368 -assign op_sh = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SH; 1.369 -`ifdef LM32_BARREL_SHIFT_ENABLED 1.370 -assign op_sl = instruction[`LM32_OP_RNG] == `LM32_OPCODE_SL; 1.371 -`endif 1.372 -assign op_sr = instruction[`LM32_OP_RNG] == `LM32_OPCODE_SR; 1.373 -assign op_sru = instruction[`LM32_OP_RNG] == `LM32_OPCODE_SRU; 1.374 -assign op_sub = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SUB; 1.375 -assign op_sw = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_SW; 1.376 -assign op_user = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_USER; 1.377 -assign op_wcsr = instruction[`LM32_OPCODE_RNG] == `LM32_OPCODE_WCSR; 1.378 -assign op_xnor = instruction[`LM32_OP_RNG] == `LM32_OPCODE_XNOR; 1.379 -assign op_xor = instruction[`LM32_OP_RNG] == `LM32_OPCODE_XOR; 1.380 - 1.381 -// Group opcodes by function 1.382 -assign arith = op_add | op_sub; 1.383 -assign logical = op_and | op_andhi | op_nor | op_or | op_orhi | op_xor | op_xnor; 1.384 -assign cmp = op_cmpe | op_cmpg | op_cmpge | op_cmpgeu | op_cmpgu | op_cmpne; 1.385 -assign bi_conditional = op_be | op_bg | op_bge | op_bgeu | op_bgu | op_bne; 1.386 -assign bi_unconditional = op_bi; 1.387 -assign bra = op_b | bi_unconditional | bi_conditional; 1.388 -assign call = op_call | op_calli; 1.389 -`ifdef LM32_BARREL_SHIFT_ENABLED 1.390 -assign shift = op_sl | op_sr | op_sru; 1.391 -`endif 1.392 -`ifdef LM32_NO_BARREL_SHIFT 1.393 -assign shift = op_sr | op_sru; 1.394 -`endif 1.395 -`ifdef CFG_MC_BARREL_SHIFT_ENABLED 1.396 -assign shift_left = op_sl; 1.397 -assign shift_right = op_sr | op_sru; 1.398 -`endif 1.399 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.400 -assign sext = op_sextb | op_sexth; 1.401 -`endif 1.402 -`ifdef LM32_MULTIPLY_ENABLED 1.403 -assign multiply = op_mul; 1.404 -`endif 1.405 -`ifdef CFG_MC_DIVIDE_ENABLED 1.406 -assign divide = op_divu; 1.407 -assign modulus = op_modu; 1.408 -`endif 1.409 -assign load = op_lb | op_lbu | op_lh | op_lhu | op_lw; 1.410 -assign store = op_sb | op_sh | op_sw; 1.411 - 1.412 -// Select pipeline multiplexor controls 1.413 -always @(*) 1.414 -begin 1.415 - // D stage 1.416 - if (call) 1.417 - d_result_sel_0 = `LM32_D_RESULT_SEL_0_NEXT_PC; 1.418 - else 1.419 - d_result_sel_0 = `LM32_D_RESULT_SEL_0_REG_0; 1.420 - if (call) 1.421 - d_result_sel_1 = `LM32_D_RESULT_SEL_1_ZERO; 1.422 - else if ((instruction[31] == 1'b0) && !bra) 1.423 - d_result_sel_1 = `LM32_D_RESULT_SEL_1_IMMEDIATE; 1.424 - else 1.425 - d_result_sel_1 = `LM32_D_RESULT_SEL_1_REG_1; 1.426 - // X stage 1.427 - x_result_sel_csr = `FALSE; 1.428 -`ifdef LM32_MC_ARITHMETIC_ENABLED 1.429 - x_result_sel_mc_arith = `FALSE; 1.430 -`endif 1.431 -`ifdef LM32_NO_BARREL_SHIFT 1.432 - x_result_sel_shift = `FALSE; 1.433 -`endif 1.434 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.435 - x_result_sel_sext = `FALSE; 1.436 -`endif 1.437 - x_result_sel_logic = `FALSE; 1.438 -`ifdef CFG_USER_ENABLED 1.439 - x_result_sel_user = `FALSE; 1.440 -`endif 1.441 - x_result_sel_add = `FALSE; 1.442 - if (op_rcsr) 1.443 - x_result_sel_csr = `TRUE; 1.444 -`ifdef LM32_MC_ARITHMETIC_ENABLED 1.445 -`ifdef CFG_MC_BARREL_SHIFT_ENABLED 1.446 - else if (shift_left | shift_right) 1.447 - x_result_sel_mc_arith = `TRUE; 1.448 -`endif 1.449 -`ifdef CFG_MC_DIVIDE_ENABLED 1.450 - else if (divide | modulus) 1.451 - x_result_sel_mc_arith = `TRUE; 1.452 -`endif 1.453 -`ifdef CFG_MC_MULTIPLY_ENABLED 1.454 - else if (multiply) 1.455 - x_result_sel_mc_arith = `TRUE; 1.456 -`endif 1.457 -`endif 1.458 -`ifdef LM32_NO_BARREL_SHIFT 1.459 - else if (shift) 1.460 - x_result_sel_shift = `TRUE; 1.461 -`endif 1.462 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.463 - else if (sext) 1.464 - x_result_sel_sext = `TRUE; 1.465 -`endif 1.466 - else if (logical) 1.467 - x_result_sel_logic = `TRUE; 1.468 -`ifdef CFG_USER_ENABLED 1.469 - else if (op_user) 1.470 - x_result_sel_user = `TRUE; 1.471 -`endif 1.472 - else 1.473 - x_result_sel_add = `TRUE; 1.474 - 1.475 - // M stage 1.476 - 1.477 - m_result_sel_compare = cmp; 1.478 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.479 - m_result_sel_shift = shift; 1.480 -`endif 1.481 - 1.482 - // W stage 1.483 - w_result_sel_load = load; 1.484 -`ifdef CFG_PL_MULTIPLY_ENABLED 1.485 - w_result_sel_mul = op_mul; 1.486 -`endif 1.487 -end 1.488 - 1.489 -// Set if result is valid at end of X stage 1.490 -assign x_bypass_enable = arith 1.491 - | logical 1.492 -`ifdef CFG_MC_BARREL_SHIFT_ENABLED 1.493 - | shift_left 1.494 - | shift_right 1.495 -`endif 1.496 -`ifdef CFG_MC_MULTIPLY_ENABLED 1.497 - | multiply 1.498 -`endif 1.499 -`ifdef CFG_MC_DIVIDE_ENABLED 1.500 - | divide 1.501 - | modulus 1.502 -`endif 1.503 -`ifdef LM32_NO_BARREL_SHIFT 1.504 - | shift 1.505 -`endif 1.506 -`ifdef CFG_SIGN_EXTEND_ENABLED 1.507 - | sext 1.508 -`endif 1.509 -`ifdef CFG_USER_ENABLED 1.510 - | op_user 1.511 -`endif 1.512 - | op_rcsr 1.513 - ; 1.514 -// Set if result is valid at end of M stage 1.515 -assign m_bypass_enable = x_bypass_enable 1.516 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.517 - | shift 1.518 -`endif 1.519 - | cmp 1.520 - ; 1.521 -// Register file read port 0 1.522 -assign read_enable_0 = ~(op_bi | op_calli); 1.523 -assign read_idx_0 = instruction[25:21]; 1.524 -// Register file read port 1 1.525 -assign read_enable_1 = ~(op_bi | op_calli | load); 1.526 -assign read_idx_1 = instruction[20:16]; 1.527 -// Register file write port 1.528 -assign write_enable = ~(bra | op_raise | store | op_wcsr); 1.529 -assign write_idx = call 1.530 - ? 5'd29 1.531 - : instruction[31] == 1'b0 1.532 - ? instruction[20:16] 1.533 - : instruction[15:11]; 1.534 - 1.535 -// Size of load/stores 1.536 -assign size = instruction[27:26]; 1.537 -// Whether to sign or zero extend 1.538 -assign sign_extend = instruction[28]; 1.539 -// Set adder_op to 1 to perform a subtraction 1.540 -assign adder_op = op_sub | op_cmpe | op_cmpg | op_cmpge | op_cmpgeu | op_cmpgu | op_cmpne | bra; 1.541 -// Logic operation (and, or, etc) 1.542 -assign logic_op = instruction[29:26]; 1.543 -`ifdef CFG_PL_BARREL_SHIFT_ENABLED 1.544 -// Shift direction 1.545 -assign direction = instruction[29]; 1.546 -`endif 1.547 -// Control flow microcodes 1.548 -assign branch = bra | call; 1.549 -assign branch_reg = op_call | op_b; 1.550 -assign condition = instruction[28:26]; 1.551 -`ifdef CFG_DEBUG_ENABLED 1.552 -assign break_opcode = op_raise & ~instruction[2]; 1.553 -`endif 1.554 -assign scall = op_raise & instruction[2]; 1.555 -assign eret = op_b & (instruction[25:21] == 5'd30); 1.556 -`ifdef CFG_DEBUG_ENABLED 1.557 -assign bret = op_b & (instruction[25:21] == 5'd31); 1.558 -`endif 1.559 -`ifdef CFG_USER_ENABLED 1.560 -// Extract user opcode 1.561 -assign user_opcode = instruction[10:0]; 1.562 -`endif 1.563 -// CSR read/write 1.564 -assign csr_write_enable = op_wcsr; 1.565 - 1.566 -// Extract immediate from instruction 1.567 - 1.568 -assign sign_extend_immediate = ~(op_and | op_cmpgeu | op_cmpgu | op_nor | op_or | op_xnor | op_xor); 1.569 -assign select_high_immediate = op_andhi | op_orhi; 1.570 -assign select_call_immediate = instruction[31]; 1.571 - 1.572 -assign high_immediate = {instruction[15:0], 16'h0000}; 1.573 -assign extended_immediate = {{16{sign_extend_immediate & instruction[15]}}, instruction[15:0]}; 1.574 -assign call_immediate = {{6{instruction[25]}}, instruction[25:0]}; 1.575 -assign branch_immediate = {{16{instruction[15]}}, instruction[15:0]}; 1.576 - 1.577 -assign immediate = select_high_immediate == `TRUE 1.578 - ? high_immediate 1.579 - : extended_immediate; 1.580 - 1.581 -assign branch_offset = select_call_immediate == `TRUE 1.582 - ? call_immediate 1.583 - : branch_immediate; 1.584 - 1.585 -endmodule 1.586 -