| module ibex_compressed_decoder ( |
| clk_i, |
| rst_ni, |
| valid_i, |
| instr_i, |
| instr_o, |
| is_compressed_o, |
| illegal_instr_o |
| ); |
| input wire clk_i; |
| input wire rst_ni; |
| input wire valid_i; |
| input wire [31:0] instr_i; |
| output reg [31:0] instr_o; |
| output wire is_compressed_o; |
| output reg illegal_instr_o; |
| localparam integer RegFileFF = 0; |
| localparam integer RegFileFPGA = 1; |
| localparam integer RegFileLatch = 2; |
| localparam integer RV32MNone = 0; |
| localparam integer RV32MSlow = 1; |
| localparam integer RV32MFast = 2; |
| localparam integer RV32MSingleCycle = 3; |
| localparam integer RV32BNone = 0; |
| localparam integer RV32BBalanced = 1; |
| localparam integer RV32BFull = 2; |
| localparam [6:0] OPCODE_LOAD = 7'h03; |
| localparam [6:0] OPCODE_MISC_MEM = 7'h0f; |
| localparam [6:0] OPCODE_OP_IMM = 7'h13; |
| localparam [6:0] OPCODE_AUIPC = 7'h17; |
| localparam [6:0] OPCODE_STORE = 7'h23; |
| localparam [6:0] OPCODE_OP = 7'h33; |
| localparam [6:0] OPCODE_LUI = 7'h37; |
| localparam [6:0] OPCODE_BRANCH = 7'h63; |
| localparam [6:0] OPCODE_JALR = 7'h67; |
| localparam [6:0] OPCODE_JAL = 7'h6f; |
| localparam [6:0] OPCODE_SYSTEM = 7'h73; |
| localparam [5:0] ALU_ADD = 0; |
| localparam [5:0] ALU_SUB = 1; |
| localparam [5:0] ALU_XOR = 2; |
| localparam [5:0] ALU_OR = 3; |
| localparam [5:0] ALU_AND = 4; |
| localparam [5:0] ALU_XNOR = 5; |
| localparam [5:0] ALU_ORN = 6; |
| localparam [5:0] ALU_ANDN = 7; |
| localparam [5:0] ALU_SRA = 8; |
| localparam [5:0] ALU_SRL = 9; |
| localparam [5:0] ALU_SLL = 10; |
| localparam [5:0] ALU_SRO = 11; |
| localparam [5:0] ALU_SLO = 12; |
| localparam [5:0] ALU_ROR = 13; |
| localparam [5:0] ALU_ROL = 14; |
| localparam [5:0] ALU_GREV = 15; |
| localparam [5:0] ALU_GORC = 16; |
| localparam [5:0] ALU_SHFL = 17; |
| localparam [5:0] ALU_UNSHFL = 18; |
| localparam [5:0] ALU_LT = 19; |
| localparam [5:0] ALU_LTU = 20; |
| localparam [5:0] ALU_GE = 21; |
| localparam [5:0] ALU_GEU = 22; |
| localparam [5:0] ALU_EQ = 23; |
| localparam [5:0] ALU_NE = 24; |
| localparam [5:0] ALU_MIN = 25; |
| localparam [5:0] ALU_MINU = 26; |
| localparam [5:0] ALU_MAX = 27; |
| localparam [5:0] ALU_MAXU = 28; |
| localparam [5:0] ALU_PACK = 29; |
| localparam [5:0] ALU_PACKU = 30; |
| localparam [5:0] ALU_PACKH = 31; |
| localparam [5:0] ALU_SEXTB = 32; |
| localparam [5:0] ALU_SEXTH = 33; |
| localparam [5:0] ALU_CLZ = 34; |
| localparam [5:0] ALU_CTZ = 35; |
| localparam [5:0] ALU_PCNT = 36; |
| localparam [5:0] ALU_SLT = 37; |
| localparam [5:0] ALU_SLTU = 38; |
| localparam [5:0] ALU_CMOV = 39; |
| localparam [5:0] ALU_CMIX = 40; |
| localparam [5:0] ALU_FSL = 41; |
| localparam [5:0] ALU_FSR = 42; |
| localparam [5:0] ALU_SBSET = 43; |
| localparam [5:0] ALU_SBCLR = 44; |
| localparam [5:0] ALU_SBINV = 45; |
| localparam [5:0] ALU_SBEXT = 46; |
| localparam [5:0] ALU_BEXT = 47; |
| localparam [5:0] ALU_BDEP = 48; |
| localparam [5:0] ALU_BFP = 49; |
| localparam [5:0] ALU_CLMUL = 50; |
| localparam [5:0] ALU_CLMULR = 51; |
| localparam [5:0] ALU_CLMULH = 52; |
| localparam [5:0] ALU_CRC32_B = 53; |
| localparam [5:0] ALU_CRC32C_B = 54; |
| localparam [5:0] ALU_CRC32_H = 55; |
| localparam [5:0] ALU_CRC32C_H = 56; |
| localparam [5:0] ALU_CRC32_W = 57; |
| localparam [5:0] ALU_CRC32C_W = 58; |
| localparam [1:0] MD_OP_MULL = 0; |
| localparam [1:0] MD_OP_MULH = 1; |
| localparam [1:0] MD_OP_DIV = 2; |
| localparam [1:0] MD_OP_REM = 3; |
| localparam [1:0] CSR_OP_READ = 0; |
| localparam [1:0] CSR_OP_WRITE = 1; |
| localparam [1:0] CSR_OP_SET = 2; |
| localparam [1:0] CSR_OP_CLEAR = 3; |
| localparam [1:0] PRIV_LVL_M = 2'b11; |
| localparam [1:0] PRIV_LVL_H = 2'b10; |
| localparam [1:0] PRIV_LVL_S = 2'b01; |
| localparam [1:0] PRIV_LVL_U = 2'b00; |
| localparam [3:0] XDEBUGVER_NO = 4'd0; |
| localparam [3:0] XDEBUGVER_STD = 4'd4; |
| localparam [3:0] XDEBUGVER_NONSTD = 4'd15; |
| localparam [1:0] WB_INSTR_LOAD = 0; |
| localparam [1:0] WB_INSTR_STORE = 1; |
| localparam [1:0] WB_INSTR_OTHER = 2; |
| localparam [1:0] OP_A_REG_A = 0; |
| localparam [1:0] OP_A_FWD = 1; |
| localparam [1:0] OP_A_CURRPC = 2; |
| localparam [1:0] OP_A_IMM = 3; |
| localparam [0:0] IMM_A_Z = 0; |
| localparam [0:0] IMM_A_ZERO = 1; |
| localparam [0:0] OP_B_REG_B = 0; |
| localparam [0:0] OP_B_IMM = 1; |
| localparam [2:0] IMM_B_I = 0; |
| localparam [2:0] IMM_B_S = 1; |
| localparam [2:0] IMM_B_B = 2; |
| localparam [2:0] IMM_B_U = 3; |
| localparam [2:0] IMM_B_J = 4; |
| localparam [2:0] IMM_B_INCR_PC = 5; |
| localparam [2:0] IMM_B_INCR_ADDR = 6; |
| localparam [0:0] RF_WD_EX = 0; |
| localparam [0:0] RF_WD_CSR = 1; |
| localparam [2:0] PC_BOOT = 0; |
| localparam [2:0] PC_JUMP = 1; |
| localparam [2:0] PC_EXC = 2; |
| localparam [2:0] PC_ERET = 3; |
| localparam [2:0] PC_DRET = 4; |
| localparam [2:0] PC_BP = 5; |
| localparam [1:0] EXC_PC_EXC = 0; |
| localparam [1:0] EXC_PC_IRQ = 1; |
| localparam [1:0] EXC_PC_DBD = 2; |
| localparam [1:0] EXC_PC_DBG_EXC = 3; |
| localparam [5:0] EXC_CAUSE_IRQ_SOFTWARE_M = {1'b1, 5'd3}; |
| localparam [5:0] EXC_CAUSE_IRQ_TIMER_M = {1'b1, 5'd7}; |
| localparam [5:0] EXC_CAUSE_IRQ_EXTERNAL_M = {1'b1, 5'd11}; |
| localparam [5:0] EXC_CAUSE_IRQ_NM = {1'b1, 5'd31}; |
| localparam [5:0] EXC_CAUSE_INSN_ADDR_MISA = {1'b0, 5'd0}; |
| localparam [5:0] EXC_CAUSE_INSTR_ACCESS_FAULT = {1'b0, 5'd1}; |
| localparam [5:0] EXC_CAUSE_ILLEGAL_INSN = {1'b0, 5'd2}; |
| localparam [5:0] EXC_CAUSE_BREAKPOINT = {1'b0, 5'd3}; |
| localparam [5:0] EXC_CAUSE_LOAD_ACCESS_FAULT = {1'b0, 5'd5}; |
| localparam [5:0] EXC_CAUSE_STORE_ACCESS_FAULT = {1'b0, 5'd7}; |
| localparam [5:0] EXC_CAUSE_ECALL_UMODE = {1'b0, 5'd8}; |
| localparam [5:0] EXC_CAUSE_ECALL_MMODE = {1'b0, 5'd11}; |
| localparam [2:0] DBG_CAUSE_NONE = 3'h0; |
| localparam [2:0] DBG_CAUSE_EBREAK = 3'h1; |
| localparam [2:0] DBG_CAUSE_TRIGGER = 3'h2; |
| localparam [2:0] DBG_CAUSE_HALTREQ = 3'h3; |
| localparam [2:0] DBG_CAUSE_STEP = 3'h4; |
| localparam [31:0] PMP_MAX_REGIONS = 16; |
| localparam [31:0] PMP_CFG_W = 8; |
| localparam [31:0] PMP_I = 0; |
| localparam [31:0] PMP_D = 1; |
| localparam [1:0] PMP_ACC_EXEC = 2'b00; |
| localparam [1:0] PMP_ACC_WRITE = 2'b01; |
| localparam [1:0] PMP_ACC_READ = 2'b10; |
| localparam [1:0] PMP_MODE_OFF = 2'b00; |
| localparam [1:0] PMP_MODE_TOR = 2'b01; |
| localparam [1:0] PMP_MODE_NA4 = 2'b10; |
| localparam [1:0] PMP_MODE_NAPOT = 2'b11; |
| localparam [11:0] CSR_MHARTID = 12'hf14; |
| localparam [11:0] CSR_MSTATUS = 12'h300; |
| localparam [11:0] CSR_MISA = 12'h301; |
| localparam [11:0] CSR_MIE = 12'h304; |
| localparam [11:0] CSR_MTVEC = 12'h305; |
| localparam [11:0] CSR_MSCRATCH = 12'h340; |
| localparam [11:0] CSR_MEPC = 12'h341; |
| localparam [11:0] CSR_MCAUSE = 12'h342; |
| localparam [11:0] CSR_MTVAL = 12'h343; |
| localparam [11:0] CSR_MIP = 12'h344; |
| localparam [11:0] CSR_PMPCFG0 = 12'h3a0; |
| localparam [11:0] CSR_PMPCFG1 = 12'h3a1; |
| localparam [11:0] CSR_PMPCFG2 = 12'h3a2; |
| localparam [11:0] CSR_PMPCFG3 = 12'h3a3; |
| localparam [11:0] CSR_PMPADDR0 = 12'h3b0; |
| localparam [11:0] CSR_PMPADDR1 = 12'h3b1; |
| localparam [11:0] CSR_PMPADDR2 = 12'h3b2; |
| localparam [11:0] CSR_PMPADDR3 = 12'h3b3; |
| localparam [11:0] CSR_PMPADDR4 = 12'h3b4; |
| localparam [11:0] CSR_PMPADDR5 = 12'h3b5; |
| localparam [11:0] CSR_PMPADDR6 = 12'h3b6; |
| localparam [11:0] CSR_PMPADDR7 = 12'h3b7; |
| localparam [11:0] CSR_PMPADDR8 = 12'h3b8; |
| localparam [11:0] CSR_PMPADDR9 = 12'h3b9; |
| localparam [11:0] CSR_PMPADDR10 = 12'h3ba; |
| localparam [11:0] CSR_PMPADDR11 = 12'h3bb; |
| localparam [11:0] CSR_PMPADDR12 = 12'h3bc; |
| localparam [11:0] CSR_PMPADDR13 = 12'h3bd; |
| localparam [11:0] CSR_PMPADDR14 = 12'h3be; |
| localparam [11:0] CSR_PMPADDR15 = 12'h3bf; |
| localparam [11:0] CSR_TSELECT = 12'h7a0; |
| localparam [11:0] CSR_TDATA1 = 12'h7a1; |
| localparam [11:0] CSR_TDATA2 = 12'h7a2; |
| localparam [11:0] CSR_TDATA3 = 12'h7a3; |
| localparam [11:0] CSR_MCONTEXT = 12'h7a8; |
| localparam [11:0] CSR_SCONTEXT = 12'h7aa; |
| localparam [11:0] CSR_DCSR = 12'h7b0; |
| localparam [11:0] CSR_DPC = 12'h7b1; |
| localparam [11:0] CSR_DSCRATCH0 = 12'h7b2; |
| localparam [11:0] CSR_DSCRATCH1 = 12'h7b3; |
| localparam [11:0] CSR_MCOUNTINHIBIT = 12'h320; |
| localparam [11:0] CSR_MHPMEVENT3 = 12'h323; |
| localparam [11:0] CSR_MHPMEVENT4 = 12'h324; |
| localparam [11:0] CSR_MHPMEVENT5 = 12'h325; |
| localparam [11:0] CSR_MHPMEVENT6 = 12'h326; |
| localparam [11:0] CSR_MHPMEVENT7 = 12'h327; |
| localparam [11:0] CSR_MHPMEVENT8 = 12'h328; |
| localparam [11:0] CSR_MHPMEVENT9 = 12'h329; |
| localparam [11:0] CSR_MHPMEVENT10 = 12'h32a; |
| localparam [11:0] CSR_MHPMEVENT11 = 12'h32b; |
| localparam [11:0] CSR_MHPMEVENT12 = 12'h32c; |
| localparam [11:0] CSR_MHPMEVENT13 = 12'h32d; |
| localparam [11:0] CSR_MHPMEVENT14 = 12'h32e; |
| localparam [11:0] CSR_MHPMEVENT15 = 12'h32f; |
| localparam [11:0] CSR_MHPMEVENT16 = 12'h330; |
| localparam [11:0] CSR_MHPMEVENT17 = 12'h331; |
| localparam [11:0] CSR_MHPMEVENT18 = 12'h332; |
| localparam [11:0] CSR_MHPMEVENT19 = 12'h333; |
| localparam [11:0] CSR_MHPMEVENT20 = 12'h334; |
| localparam [11:0] CSR_MHPMEVENT21 = 12'h335; |
| localparam [11:0] CSR_MHPMEVENT22 = 12'h336; |
| localparam [11:0] CSR_MHPMEVENT23 = 12'h337; |
| localparam [11:0] CSR_MHPMEVENT24 = 12'h338; |
| localparam [11:0] CSR_MHPMEVENT25 = 12'h339; |
| localparam [11:0] CSR_MHPMEVENT26 = 12'h33a; |
| localparam [11:0] CSR_MHPMEVENT27 = 12'h33b; |
| localparam [11:0] CSR_MHPMEVENT28 = 12'h33c; |
| localparam [11:0] CSR_MHPMEVENT29 = 12'h33d; |
| localparam [11:0] CSR_MHPMEVENT30 = 12'h33e; |
| localparam [11:0] CSR_MHPMEVENT31 = 12'h33f; |
| localparam [11:0] CSR_MCYCLE = 12'hb00; |
| localparam [11:0] CSR_MINSTRET = 12'hb02; |
| localparam [11:0] CSR_MHPMCOUNTER3 = 12'hb03; |
| localparam [11:0] CSR_MHPMCOUNTER4 = 12'hb04; |
| localparam [11:0] CSR_MHPMCOUNTER5 = 12'hb05; |
| localparam [11:0] CSR_MHPMCOUNTER6 = 12'hb06; |
| localparam [11:0] CSR_MHPMCOUNTER7 = 12'hb07; |
| localparam [11:0] CSR_MHPMCOUNTER8 = 12'hb08; |
| localparam [11:0] CSR_MHPMCOUNTER9 = 12'hb09; |
| localparam [11:0] CSR_MHPMCOUNTER10 = 12'hb0a; |
| localparam [11:0] CSR_MHPMCOUNTER11 = 12'hb0b; |
| localparam [11:0] CSR_MHPMCOUNTER12 = 12'hb0c; |
| localparam [11:0] CSR_MHPMCOUNTER13 = 12'hb0d; |
| localparam [11:0] CSR_MHPMCOUNTER14 = 12'hb0e; |
| localparam [11:0] CSR_MHPMCOUNTER15 = 12'hb0f; |
| localparam [11:0] CSR_MHPMCOUNTER16 = 12'hb10; |
| localparam [11:0] CSR_MHPMCOUNTER17 = 12'hb11; |
| localparam [11:0] CSR_MHPMCOUNTER18 = 12'hb12; |
| localparam [11:0] CSR_MHPMCOUNTER19 = 12'hb13; |
| localparam [11:0] CSR_MHPMCOUNTER20 = 12'hb14; |
| localparam [11:0] CSR_MHPMCOUNTER21 = 12'hb15; |
| localparam [11:0] CSR_MHPMCOUNTER22 = 12'hb16; |
| localparam [11:0] CSR_MHPMCOUNTER23 = 12'hb17; |
| localparam [11:0] CSR_MHPMCOUNTER24 = 12'hb18; |
| localparam [11:0] CSR_MHPMCOUNTER25 = 12'hb19; |
| localparam [11:0] CSR_MHPMCOUNTER26 = 12'hb1a; |
| localparam [11:0] CSR_MHPMCOUNTER27 = 12'hb1b; |
| localparam [11:0] CSR_MHPMCOUNTER28 = 12'hb1c; |
| localparam [11:0] CSR_MHPMCOUNTER29 = 12'hb1d; |
| localparam [11:0] CSR_MHPMCOUNTER30 = 12'hb1e; |
| localparam [11:0] CSR_MHPMCOUNTER31 = 12'hb1f; |
| localparam [11:0] CSR_MCYCLEH = 12'hb80; |
| localparam [11:0] CSR_MINSTRETH = 12'hb82; |
| localparam [11:0] CSR_MHPMCOUNTER3H = 12'hb83; |
| localparam [11:0] CSR_MHPMCOUNTER4H = 12'hb84; |
| localparam [11:0] CSR_MHPMCOUNTER5H = 12'hb85; |
| localparam [11:0] CSR_MHPMCOUNTER6H = 12'hb86; |
| localparam [11:0] CSR_MHPMCOUNTER7H = 12'hb87; |
| localparam [11:0] CSR_MHPMCOUNTER8H = 12'hb88; |
| localparam [11:0] CSR_MHPMCOUNTER9H = 12'hb89; |
| localparam [11:0] CSR_MHPMCOUNTER10H = 12'hb8a; |
| localparam [11:0] CSR_MHPMCOUNTER11H = 12'hb8b; |
| localparam [11:0] CSR_MHPMCOUNTER12H = 12'hb8c; |
| localparam [11:0] CSR_MHPMCOUNTER13H = 12'hb8d; |
| localparam [11:0] CSR_MHPMCOUNTER14H = 12'hb8e; |
| localparam [11:0] CSR_MHPMCOUNTER15H = 12'hb8f; |
| localparam [11:0] CSR_MHPMCOUNTER16H = 12'hb90; |
| localparam [11:0] CSR_MHPMCOUNTER17H = 12'hb91; |
| localparam [11:0] CSR_MHPMCOUNTER18H = 12'hb92; |
| localparam [11:0] CSR_MHPMCOUNTER19H = 12'hb93; |
| localparam [11:0] CSR_MHPMCOUNTER20H = 12'hb94; |
| localparam [11:0] CSR_MHPMCOUNTER21H = 12'hb95; |
| localparam [11:0] CSR_MHPMCOUNTER22H = 12'hb96; |
| localparam [11:0] CSR_MHPMCOUNTER23H = 12'hb97; |
| localparam [11:0] CSR_MHPMCOUNTER24H = 12'hb98; |
| localparam [11:0] CSR_MHPMCOUNTER25H = 12'hb99; |
| localparam [11:0] CSR_MHPMCOUNTER26H = 12'hb9a; |
| localparam [11:0] CSR_MHPMCOUNTER27H = 12'hb9b; |
| localparam [11:0] CSR_MHPMCOUNTER28H = 12'hb9c; |
| localparam [11:0] CSR_MHPMCOUNTER29H = 12'hb9d; |
| localparam [11:0] CSR_MHPMCOUNTER30H = 12'hb9e; |
| localparam [11:0] CSR_MHPMCOUNTER31H = 12'hb9f; |
| localparam [11:0] CSR_CPUCTRL = 12'h7c0; |
| localparam [11:0] CSR_SECURESEED = 12'h7c1; |
| localparam [11:0] CSR_OFF_PMP_CFG = 12'h3a0; |
| localparam [11:0] CSR_OFF_PMP_ADDR = 12'h3b0; |
| localparam [31:0] CSR_MSTATUS_MIE_BIT = 3; |
| localparam [31:0] CSR_MSTATUS_MPIE_BIT = 7; |
| localparam [31:0] CSR_MSTATUS_MPP_BIT_LOW = 11; |
| localparam [31:0] CSR_MSTATUS_MPP_BIT_HIGH = 12; |
| localparam [31:0] CSR_MSTATUS_MPRV_BIT = 17; |
| localparam [31:0] CSR_MSTATUS_TW_BIT = 21; |
| localparam [1:0] CSR_MISA_MXL = 2'd1; |
| localparam [31:0] CSR_MSIX_BIT = 3; |
| localparam [31:0] CSR_MTIX_BIT = 7; |
| localparam [31:0] CSR_MEIX_BIT = 11; |
| localparam [31:0] CSR_MFIX_BIT_LOW = 16; |
| localparam [31:0] CSR_MFIX_BIT_HIGH = 30; |
| wire unused_valid; |
| assign unused_valid = valid_i; |
| always @(*) begin |
| instr_o = instr_i; |
| illegal_instr_o = 1'b0; |
| case (instr_i[1:0]) |
| 2'b00: |
| case (instr_i[15:13]) |
| 3'b000: begin |
| instr_o = {2'b00, instr_i[10:7], instr_i[12:11], instr_i[5], instr_i[6], 2'b00, 5'h02, 3'b000, 2'b01, instr_i[4:2], OPCODE_OP_IMM}; |
| if (instr_i[12:5] == 8'b00000000) |
| illegal_instr_o = 1'b1; |
| end |
| 3'b010: instr_o = {5'b00000, instr_i[5], instr_i[12:10], instr_i[6], 2'b00, 2'b01, instr_i[9:7], 3'b010, 2'b01, instr_i[4:2], OPCODE_LOAD}; |
| 3'b110: instr_o = {5'b00000, instr_i[5], instr_i[12], 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b010, instr_i[11:10], instr_i[6], 2'b00, OPCODE_STORE}; |
| 3'b001, 3'b011, 3'b100, 3'b101, 3'b111: illegal_instr_o = 1'b1; |
| default: illegal_instr_o = 1'b1; |
| endcase |
| 2'b01: |
| case (instr_i[15:13]) |
| 3'b000: instr_o = {{6 {instr_i[12]}}, instr_i[12], instr_i[6:2], instr_i[11:7], 3'b000, instr_i[11:7], OPCODE_OP_IMM}; |
| 3'b001, 3'b101: instr_o = {instr_i[12], instr_i[8], instr_i[10:9], instr_i[6], instr_i[7], instr_i[2], instr_i[11], instr_i[5:3], {9 {instr_i[12]}}, 4'b0000, ~instr_i[15], OPCODE_JAL}; |
| 3'b010: instr_o = {{6 {instr_i[12]}}, instr_i[12], instr_i[6:2], 5'b00000, 3'b000, instr_i[11:7], OPCODE_OP_IMM}; |
| 3'b011: begin |
| instr_o = {{15 {instr_i[12]}}, instr_i[6:2], instr_i[11:7], OPCODE_LUI}; |
| if (instr_i[11:7] == 5'h02) |
| instr_o = {{3 {instr_i[12]}}, instr_i[4:3], instr_i[5], instr_i[2], instr_i[6], 4'b0000, 5'h02, 3'b000, 5'h02, OPCODE_OP_IMM}; |
| if ({instr_i[12], instr_i[6:2]} == 6'b000000) |
| illegal_instr_o = 1'b1; |
| end |
| 3'b100: |
| case (instr_i[11:10]) |
| 2'b00, 2'b01: begin |
| instr_o = {1'b0, instr_i[10], 5'b00000, instr_i[6:2], 2'b01, instr_i[9:7], 3'b101, 2'b01, instr_i[9:7], OPCODE_OP_IMM}; |
| if (instr_i[12] == 1'b1) |
| illegal_instr_o = 1'b1; |
| end |
| 2'b10: instr_o = {{6 {instr_i[12]}}, instr_i[12], instr_i[6:2], 2'b01, instr_i[9:7], 3'b111, 2'b01, instr_i[9:7], OPCODE_OP_IMM}; |
| 2'b11: |
| case ({instr_i[12], instr_i[6:5]}) |
| 3'b000: instr_o = {2'b01, 5'b00000, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b000, 2'b01, instr_i[9:7], OPCODE_OP}; |
| 3'b001: instr_o = {7'b0000000, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b100, 2'b01, instr_i[9:7], OPCODE_OP}; |
| 3'b010: instr_o = {7'b0000000, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b110, 2'b01, instr_i[9:7], OPCODE_OP}; |
| 3'b011: instr_o = {7'b0000000, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b111, 2'b01, instr_i[9:7], OPCODE_OP}; |
| 3'b100, 3'b101, 3'b110, 3'b111: illegal_instr_o = 1'b1; |
| default: illegal_instr_o = 1'b1; |
| endcase |
| default: illegal_instr_o = 1'b1; |
| endcase |
| 3'b110, 3'b111: instr_o = {{4 {instr_i[12]}}, instr_i[6:5], instr_i[2], 5'b00000, 2'b01, instr_i[9:7], 2'b00, instr_i[13], instr_i[11:10], instr_i[4:3], instr_i[12], OPCODE_BRANCH}; |
| default: illegal_instr_o = 1'b1; |
| endcase |
| 2'b10: |
| case (instr_i[15:13]) |
| 3'b000: begin |
| instr_o = {7'b0000000, instr_i[6:2], instr_i[11:7], 3'b001, instr_i[11:7], OPCODE_OP_IMM}; |
| if (instr_i[12] == 1'b1) |
| illegal_instr_o = 1'b1; |
| end |
| 3'b010: begin |
| instr_o = {4'b0000, instr_i[3:2], instr_i[12], instr_i[6:4], 2'b00, 5'h02, 3'b010, instr_i[11:7], OPCODE_LOAD}; |
| if (instr_i[11:7] == 5'b00000) |
| illegal_instr_o = 1'b1; |
| end |
| 3'b100: |
| if (instr_i[12] == 1'b0) begin |
| if (instr_i[6:2] != 5'b00000) |
| instr_o = {7'b0000000, instr_i[6:2], 5'b00000, 3'b000, instr_i[11:7], OPCODE_OP}; |
| else begin |
| instr_o = {12'b000000000000, instr_i[11:7], 3'b000, 5'b00000, OPCODE_JALR}; |
| if (instr_i[11:7] == 5'b00000) |
| illegal_instr_o = 1'b1; |
| end |
| end |
| else if (instr_i[6:2] != 5'b00000) |
| instr_o = {7'b0000000, instr_i[6:2], instr_i[11:7], 3'b000, instr_i[11:7], OPCODE_OP}; |
| else if (instr_i[11:7] == 5'b00000) |
| instr_o = 32'h00100073; |
| else |
| instr_o = {12'b000000000000, instr_i[11:7], 3'b000, 5'b00001, OPCODE_JALR}; |
| 3'b110: instr_o = {4'b0000, instr_i[8:7], instr_i[12], instr_i[6:2], 5'h02, 3'b010, instr_i[11:9], 2'b00, OPCODE_STORE}; |
| 3'b001, 3'b011, 3'b101, 3'b111: illegal_instr_o = 1'b1; |
| default: illegal_instr_o = 1'b1; |
| endcase |
| 2'b11: |
| ; |
| default: illegal_instr_o = 1'b1; |
| endcase |
| end |
| assign is_compressed_o = instr_i[1:0] != 2'b11; |
| endmodule |