prototype BJX1 instruction decoder. 2

/*
Instruction Word
 15: 0, First Word
 31:16, Second Word
 */

`include "CoreDefs.v"

module DecOp3(
    /* verilator lint_off UNUSED */
    clk,
    istrWord,
    regCsFl,
    idRegN,
    idRegS,
    idRegT,
    idImm,
    idStepPc,
    idStepPc2,
    idUCmd
    );

parameter       decEnable64 = 0;        //Enable BJX1-64 ISA
parameter       decEnable64A = 0;       //Enable BJX1-64A ISA
parameter       decEnableBJX1 = 1;      //Enable BJX1 extensions

input           clk;        //clock
input[47:0]     istrWord;   //source instruction word
input[15:0]     regCsFl;    //current SR/FPSCR

output[6:0]     idRegN;
output[6:0]     idRegS;
output[6:0]     idRegT;
output[31:0]    idImm;
output[3:0]     idStepPc;
output[3:0]     idStepPc2;

output[7:0]     idUCmd;


reg         isOp32;     //opcode is 32-bit
reg         isOp8E;     //8Ezz_zzzz
reg         isOpCE;     //CEzz_zzzz
reg         isOpXE;     //8Ezz_zzzz || CEzz_zzzz

reg         isOpCC0;    //CC0e_zzzz
reg         isOpCC3;    //CC3e_zzzz
reg[3:0]    opCCe;
reg         opPsDQ;
reg         opPwDQ;
reg         opPlDQ;
reg         opJQ;
// reg      opMovFpr;
reg         opUseBase16;    //op uses basic 16-bit decoder

reg[7:0] opPfxImm;
reg[15:0] opCmdWord;

reg[6:0]        opRegN;
reg[6:0]        opRegS;
reg[6:0]        opRegT; //Index for mem ops
reg[31:0]       opImm;  //Disp for mem ops
reg[7:0]        opUCmd;
reg[3:0]        opStepPc;
reg[3:0]        opStepPc2;

assign  idRegN = opRegN;
assign  idRegS = opRegS;
assign  idRegT = opRegT;
assign  idImm = opImm;
assign  idUCmd = opUCmd;
assign  idStepPc = opStepPc;
assign  idStepPc2 = opStepPc2;


// reg[6:0] tOpRegDflN;
// reg[6:0] tOpRegDflM;

// reg          tOpDflRns;
// reg          tOpDflRnst;

reg[4:0]    tOpDecXfrm;
reg[3:0]    tOpDecXfrmZx;

reg[7:0]    tOpW2;


reg[6:0]    opRegN_Dfl;
reg[6:0]    opRegM_Dfl;
reg[6:0]    opRegO_Dfl;
reg[6:0]    opRegS_8E;
reg[6:0]    opRegT_8E;
reg[6:0]    opRegN_CEf;
reg[6:0]    opRegM_CEf;

reg[6:0]    opRegN_CEe;
reg[6:0]    opRegM_CEe;
reg[6:0]    opRegO_CEe;
reg[6:0]    opRegT_CEe;

reg[6:0]    opRegM_CR;
reg[6:0]    opRegM_SR;

reg[6:0]    opRegN_FR;
reg[6:0]    opRegM_FR;
reg[6:0]    opRegO_FR;
reg[6:0]    opRegS_FR;
reg[6:0]    opRegT_FR;

reg[6:0]    opRegN_N3;
reg[6:0]    opRegM_N3;

reg[31:0]   opImm_Zx4;
reg[31:0]   opImm_Zx4_8E;
reg[31:0]   opImm_Zx8;
reg[31:0]   opImm_Sx8;
reg[31:0]   opImm_Sx12;
reg[31:0]   opImm_Sx8E;
reg[31:0]   opImm_Zx8E;
reg[31:0]   opImm_Nx8E;
reg[31:0]   opImm_Sx16_8E;
reg[31:0]   opImm_Sx20_8E;
reg[31:0]   opImmM_Sx12_8E;
reg[31:0]   opImmO_Sx12_8E;

reg[31:0]   opImm6_SxCE;
reg[31:0]   opImm6_ZxCE;
reg[31:0]   opImm6_NxCE;

reg         opIsRegN_FR;
reg         opIsRegM_FR;
reg         opIsRegS_FR;
reg         opIsRegT_FR;

reg         opIsRegM_CR;
reg         opIsRegM_SR;


always @*
begin

    opStepPc = 2;

//  opPfxImm=0;
//  opCmdWord=0;

    opPfxImm=8'hXX;
    opCmdWord=0;

//  opRegN=0;
//  opRegS=0;
//  opRegT=0;
    opUCmd=UCMD_UDBRK;
    opImm=0;


    isOp32=0;
    isOp8E=0;   isOpCE=0;   isOpXE=0;
    isOpCC0=0;  isOpCC3=0;  opCCe=0;
//  opMovFpr=0;
    opUseBase16=1;


    opRegN=UREG_ZZR;
    opRegS=UREG_ZZR;
    opRegT=UREG_ZZR;

    opIsRegN_FR=0;  opIsRegM_FR=0;
    opIsRegS_FR=0;  opIsRegT_FR=0;
    opIsRegM_CR=0;  opIsRegM_SR=0;

    tOpDecXfrm=UXFORM_CST;
    tOpDecXfrmZx=UXFORMZX_SX;

    if(decEnable64 && regCsFl[5])
    begin
        opJQ=1;         opPsDQ=regCsFl[6];
        opPwDQ=opPsDQ;  opPlDQ=0;
    end else begin
        opJQ=0;         opPsDQ=0;
        opPwDQ=0;       opPlDQ=0;
    end

    opCmdWord=istrWord[15:0];
    tOpW2=istrWord[31:24];

    if(decEnableBJX1)
    begin
        case(istrWord[15:8])
            8'h8A: begin
                isOp32=1;
                opCmdWord=istrWord[15:0];
                tOpW2=istrWord[47:40];

                opImm[31:24]=istrWord[7]?8'hFF:8'h00;
                opImm[23:16]=istrWord[7:0];
                opImm[15: 0]=istrWord[31:16];

                opRegN=UREG_R0;
                opUCmd=UCMD_MOV_RI;
                tOpDecXfrm=UXFORM_CST;
                opUseBase16=0;
            end

            8'h8E: begin
                isOp32=1;
                isOp8E=1;
                isOpXE=1;
                opPfxImm=istrWord[7:0];
                opCmdWord=istrWord[31:16];
                tOpW2=istrWord[47:40];
            end

            8'hCC: begin
                if(decEnable64A && opJQ)
                begin
                    isOp32=1;
                    isOpCE=0;
                    isOpXE=0;
                    isOpCC0 = (istrWord[7:4]==4'h0);
                    isOpCC3 = (istrWord[7:4]==4'h3);
                    opCCe=istrWord[3:0];
                    opPsDQ=istrWord[3];
                    opPwDQ=0;
                    opPlDQ=opPsDQ;
                    opPfxImm=0;
                    opCmdWord=istrWord[31:16];
                    tOpW2=istrWord[47:40];
                end
            end

            8'hCE: begin
                if(decEnable64A && opJQ)
                begin
                    isOp32=1;
                    isOpCE=1;
                    isOpXE=1;
                    opPfxImm=istrWord[7:0];
                    opCmdWord=istrWord[31:16];
                    tOpW2=istrWord[47:40];
                    opPsDQ=istrWord[7];
                    opPwDQ=0;
                    opPlDQ=0;
                end
            end

            default: begin
            end
        endcase

        if(isOp32)
            opStepPc = 4;
    end

    opStepPc2 = 2;
    if(decEnableBJX1)
    begin
        case(tOpW2)
            8'h8A:      opStepPc2 = 4;
            8'h8C:      opStepPc2 = 4;
            8'h8E:      opStepPc2 = 4;

            8'hCC:      opStepPc2 = (opJQ && decEnable64A) ? 4 : 2;
            8'hCE:      opStepPc2 = (opJQ && decEnable64A) ? 4 : 2;

            default:    opStepPc2 = 2;
        endcase
    end

    if(decEnable64A)
    begin
        if(isOpCC3)     /* BJX1-64A */
        begin
            opUseBase16=0;
            casez(opCmdWord[15:12])
                4'h0: opUCmd=UCMD_ALU_ADD;
                4'h1: opUCmd=UCMD_ALU_SUB;
                4'h2: opUCmd=UCMD_ALU_MUL;
                4'h3: opUCmd=UCMD_ALU_AND;
                4'h4: opUCmd=UCMD_ALU_OR;
                4'h5: opUCmd=UCMD_ALU_XOR;

                4'h6: opUCmd=opCCe[3] ? UCMD_ALU_SHLDQ  : UCMD_ALU_SHLD;
                4'h7: opUCmd=opCCe[3] ? UCMD_ALU_SHLDRQ : UCMD_ALU_SHLDR;
                4'h8: opUCmd=opCCe[3] ? UCMD_ALU_SHADQ  : UCMD_ALU_SHAD;
                4'h9: opUCmd=opCCe[3] ? UCMD_ALU_SHADRQ : UCMD_ALU_SHADR;

                4'hC: opUCmd=UCMD_FPU_ADD;
                4'hD: opUCmd=UCMD_FPU_SUB;
                4'hE: opUCmd=UCMD_FPU_MUL;

                default: begin end
            endcase

            if(opCmdWord[15:14]==2'h3)
            begin
                opRegN={2'h2, opCCe[2], opCmdWord[11:8]};
                opRegS={2'h2, opCCe[1], opCmdWord[ 7:4]};
                opRegT={2'h2, opCCe[0], opCmdWord[ 3:0]};
            end
            else
            begin
                opRegN={2'h0, opCCe[2], opCmdWord[11:8]};
                opRegS={2'h0, opCCe[1], opCmdWord[ 7:4]};
                opRegT={2'h0, opCCe[0], opCmdWord[ 3:0]};
            end
            tOpDecXfrm=UXFORM_CST;
        end
    end

    if(opUseBase16)
        casez(opCmdWord[15:0])

        16'h0zz0: begin
            /* Unimplemented, 2A */
        end

        16'h0zz1: begin
            /* Unimplemented, 2A */
        end

        16'h0zz2: begin     //0xx2, STC
            opUCmd=UCMD_MOV_RR;     tOpDecXfrm=UXFORM_ARI_NS;
            tOpDecXfrmZx=UXFORMZX_CR;
        end

        16'h0zz4: begin     //0xx4
            opUCmd=UCMD_MOVB_RM;    tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zz5: begin     //0xx5
            opUCmd = opPwDQ ? UCMD_MOVQ_RM : UCMD_MOVW_RM;
            tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zz6: begin     //0xx6
            opUCmd = opPlDQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
            tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zz7: begin     //0xx7
            if(isOpXE)
            begin
                opUCmd=UCMD_MOVQ_RM;    tOpDecXfrm=UXFORM_MOV_NSO;
            end
            else
            begin
                opUCmd=UCMD_ALU_DMULS;  tOpDecXfrm=UXFORM_ARI_ST;
            end
        end

        /* 0xx8 */
            16'h0z08: begin     //0x08
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_CLRT;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z18: begin     //0x18
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_SETT;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z28: begin     //0x28
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_CLRMAC;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z38: begin     //0x38
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_LDTLB;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z48: begin     //0x48
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_CLRS;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z58: begin     //0x58
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_SETS;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z68: begin     //0x68
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_NOTT;
                tOpDecXfrm=UXFORM_CST;
            end

        /* 0xx9 */
            16'h0z09: begin     //0x09
                opUCmd=UCMD_NONE;       tOpDecXfrm=UXFORM_Z;
            end
            16'h0z19: begin     //0x19
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_DIV0U;
                tOpDecXfrm=UXFORM_CST;
            end
            16'h0z29: begin     //0x29
                opUCmd=UCMD_ALU_MOVT;   tOpDecXfrm=UXFORM_N;
            end
            16'h0z39: begin     //0x39
                opUCmd=UCMD_ALU_MOVRT;  tOpDecXfrm=UXFORM_N;
            end

        16'h0zzA: begin     //0xxA
            opUCmd=UCMD_MOV_RR;     tOpDecXfrm=UXFORM_ARI_NS;
            tOpDecXfrmZx=UXFORMZX_SR;
        end

        /* 0xxB */
            16'h0z0B: begin     //0z0B
                opUCmd=UCMD_RTS;        tOpDecXfrm=UXFORM_Z;
            end

            16'h0z1B: begin     //0x1B
                opUCmd=UCMD_ALU_SPOP;
                opImm[7:0]=UCMDP_ALU_SLEEP;
                tOpDecXfrm=UXFORM_CST;
            end

            16'h0z2B: begin     //0z2B
                opUCmd=UCMD_RTE;        tOpDecXfrm=UXFORM_Z;
            end

            16'h0z3B: begin     //0z3B
                opUCmd=UCMD_UDBRK;      tOpDecXfrm=UXFORM_Z;
                opImm=1;
                if(opCmdWord[11:8]==4'hF)
                begin
                    opUCmd=UCMD_NONE;
                    opStepPc=0;
                end
            end

            16'h0z6B: begin     //0z6B
                opUCmd=UCMD_RTSN;       tOpDecXfrm=UXFORM_Z;
            end

        16'h0zzC: begin     //0xxC
            opUCmd=UCMD_MOVB_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zzD: begin     //0xxD
            opUCmd = opPwDQ ? UCMD_MOVQ_MR : UCMD_MOVW_MR;
            tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zzE: begin     //0xxE
            opUCmd = opPlDQ ? UCMD_MOVQ_MR : UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_MOV_NSO;
        end

        16'h0zzF: begin     //0xxF
            //MAC.L
        end

        16'h1zzz: begin     //1nmd, MOV.L Rm, @(Rn, disp4)
            opUCmd =  opPlDQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
            tOpDecXfrm=UXFORM_MOV_NSJ;
        end

        16'h2zz0: begin     //2xx0, MOV.B Rm, @Rn
            opUCmd=UCMD_MOVB_RM;    tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h2zz1: begin     //2xx1, MOV.W Rm, @Rn
            opUCmd = opPwDQ ? UCMD_MOVQ_RM : UCMD_MOVW_RM;
            tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h2zz2: begin     //2xx2, MOV.L Rm, @Rn
            opUCmd = opPlDQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
            tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h2zz3: begin     //2xx3, CAS.L Rm, Rn, @R0
            opUCmd=UCMD_CASL;       tOpDecXfrm=UXFORM_MOV_NSO;
        end
        16'h2zz4: begin     //2xx4, MOV.B @Rm, Rn
            opUCmd=UCMD_MOVB_RM;    tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_PDEC;
        end
        16'h2zz5: begin     //2xx5, MOV.W @Rm, Rn
            opUCmd = opPwDQ ? UCMD_MOVQ_RM : UCMD_MOVW_RM;
            tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_PDEC;
        end
        16'h2zz6: begin     //2xx6, MOV.L @Rm, Rn
            opUCmd = opPlDQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
            tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_PDEC;
        end
        16'h2zz7: begin     //2xx7, DIV0S Rm, Rn
            opUCmd=UCMD_ALU_DIV0S;  tOpDecXfrm=UXFORM_ARI_ST;
        end
        16'h2zz8: begin     //2xx8, TST Rm, Rn
            opUCmd=UCMD_CMP_TST;    tOpDecXfrm=UXFORM_CMP_ST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h2zz9: begin     //2xx9, AND Rm, Rn
            opUCmd=UCMD_ALU_AND;    tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h2zzA: begin     //2xxA, XOR Rm, Rn
            opUCmd=UCMD_ALU_XOR;    tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h2zzB: begin     //2xxB, OR Rm, Rn
            opUCmd=UCMD_ALU_OR;     tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h2zzC: begin     //2xxC, CMPSTR Rm, Rn
            opUCmd=UCMD_ALU_CMPSTR; tOpDecXfrm=UXFORM_ARI_NST;
        end
        16'h2zzD: begin     //2xxD, XTRCT Rm, Rn
            opUCmd=UCMD_ALU_XTRCT;  tOpDecXfrm=UXFORM_ARI_NST;
        end
        16'h2zzE: begin     //2xxE, MULU.W Rm, Rn
            opUCmd=UCMD_ALU_MULUW;  tOpDecXfrm=UXFORM_ARI_ST;
        end
        16'h2zzF: begin     //2xxF, MULS.W Rm, Rn
            opUCmd=UCMD_ALU_MULSW;  tOpDecXfrm=UXFORM_ARI_ST;
        end

        16'h3zz0: begin     //3xx0, CMP/EQ Rm, Rn
            opUCmd=opPsDQ ? UCMD_CMPQ_EQ : UCMD_CMP_EQ;
            tOpDecXfrm=UXFORM_CMP_ST;
        end
        16'h3zz1: begin     //3xx1
        end
        16'h3zz2: begin     //3xx2, CMP/HS Rm, Rn
            opUCmd=opPsDQ ? UCMD_CMPQ_HS : UCMD_CMP_HS;
            tOpDecXfrm=UXFORM_CMP_ST;
        end
        16'h3zz3: begin     //3xx3, CMP/GE Rm, Rn
            opUCmd=opPsDQ ? UCMD_CMPQ_GE : UCMD_CMP_GE;
            tOpDecXfrm=UXFORM_CMP_ST;
        end
        16'h3zz4: begin     //3xx4, DIV1 Rm, Rn
            opUCmd=UCMD_ALU_DIV1;       tOpDecXfrm=UXFORM_ARI_NST;
        end
        16'h3zz5: begin     //3xx5, DMULU.L Rm, Rn
            opUCmd=UCMD_ALU_DMULU;  tOpDecXfrm=UXFORM_ARI_ST;
        end
        16'h3zz6: begin     //3xx6, CMP/HI Rm, Rn
            opUCmd=opPsDQ ? UCMD_CMPQ_HI : UCMD_CMP_HI;
            tOpDecXfrm=UXFORM_CMP_ST;
        end
        16'h3zz7: begin     //3xx7, CMP/GT Rm, Rn
            opUCmd=opPsDQ ? UCMD_CMPQ_GT : UCMD_CMP_GT;
            tOpDecXfrm=UXFORM_CMP_ST;
        end
        16'h3zz8: begin     //3xx8, SUB Rm, Rn
            opUCmd=UCMD_ALU_SUB;    tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h3zz9: begin     //3xx9
        end
        16'h3zzA: begin     //3xxA, SUBC Rm, Rn
            opUCmd=UCMD_ALU_SUBC;   tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h3zzB: begin     //3xxB, SUBV Rm, Rn
            opUCmd=UCMD_ALU_SUBV;   tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h3zzC: begin     //3xxC, ADD Rm, Rn
            opUCmd=UCMD_ALU_ADD;    tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_ZX;
        end
        16'h3zzD: begin     //3xxD, DMULS.L Rm, Rn
            opUCmd=UCMD_ALU_DMULS;  tOpDecXfrm=UXFORM_ARI_ST;
        end
        16'h3zzE: begin     //3xxE, ADDC Rm, Rn
            opUCmd=UCMD_ALU_ADDC;   tOpDecXfrm=UXFORM_ARI_NST;
        end
        16'h3zzF: begin     //3xxF, ADDV Rm, Rn
            opUCmd=UCMD_ALU_ADDV;   tOpDecXfrm=UXFORM_ARI_NST;
        end

        /* 4xx0 */
            16'h4z00: begin     //4x00
                opUCmd=UCMD_ALU_SHLL;   tOpDecXfrm=UXFORM_N;
            end
            16'h4z10: begin     //4x10
                opUCmd=UCMD_ALU_DT;     tOpDecXfrm=UXFORM_N;
            end
            16'h4z20: begin     //4x20
                opUCmd=UCMD_ALU_SHAL;   tOpDecXfrm=UXFORM_N;
            end

        /* 4xx1 */
            16'h4z01: begin     //4x01
                opUCmd=UCMD_ALU_SHLR;   tOpDecXfrm=UXFORM_N;
            end
            16'h4z11: begin     //4x11
                opUCmd=opPsDQ ? UCMD_CMPQ_GE : UCMD_CMP_GE;
                tOpDecXfrm=UXFORM_M;
            end
            16'h4z21: begin     //4x21
                opUCmd=UCMD_ALU_SHAR;   tOpDecXfrm=UXFORM_N;
            end

        16'h4zz2: begin     //4xx2
            opUCmd = opJQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
            tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_SR;
        end
        16'h4zz3: begin     //4xx3
            if(isOpXE)  begin
                case(opCmdWord[7:4])
                4'h0: begin
                    opUCmd=UCMD_ALU_ADD;    tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h1: begin
                    opUCmd=UCMD_ALU_SUB;    tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h2: begin
                    opUCmd=UCMD_ALU_MUL;    tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h3: begin
                    opUCmd=UCMD_ALU_AND;    tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h4: begin
                    opUCmd=UCMD_ALU_OR;     tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h5: begin
                    opUCmd=UCMD_ALU_XOR;    tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h6: begin
                    opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h7: begin
                    opUCmd=UCMD_ALU_SHLDR;  tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h8: begin
                    opUCmd=UCMD_ALU_SHAD;   tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h9: begin
                    opUCmd=UCMD_ALU_SHADR;  tOpDecXfrm=UXFORM_NST_8E;
                end

                4'hC: begin
                    opUCmd=UCMD_FPU_ADD;    tOpDecXfrm=UXFORM_NST_8E;
//                  opIsRegN_FR=1;  opIsRegS_FR=1;  opIsRegT_FR=1;
                    tOpDecXfrmZx=UXFORMZX_FF;
                end
                4'hD: begin
                    opUCmd=UCMD_FPU_SUB;    tOpDecXfrm=UXFORM_NST_8E;
//                  opIsRegN_FR=1;  opIsRegS_FR=1;  opIsRegT_FR=1;
                    tOpDecXfrmZx=UXFORMZX_FF;
                end
                4'hE: begin
                    opUCmd=UCMD_FPU_MUL;    tOpDecXfrm=UXFORM_NST_8E;
//                  opIsRegN_FR=1;  opIsRegS_FR=1;  opIsRegT_FR=1;
                    tOpDecXfrmZx=UXFORMZX_FF;
                end

                default: begin end

                endcase
            end
            else
            begin
                opUCmd = opJQ ? UCMD_MOVQ_RM : UCMD_MOVL_RM;
                tOpDecXfrm=UXFORM_MOV_NSDEC;
                tOpDecXfrmZx=UXFORMZX_CR;
            end
        end

        /* 4xx4 */
            16'h4z04: begin     //4x00
                opUCmd=UCMD_ALU_ROTL;   tOpDecXfrm=UXFORM_N;
            end
            16'h4z14: begin     //4x10
//              opUCmd=UCMD_ALU_DT;     tOpDecXfrm=UXFORM_N;
            end
            16'h4z24: begin     //4x20
                opUCmd=UCMD_ALU_ROTCL;  tOpDecXfrm=UXFORM_N;
            end

        /* 4xx5 */
            16'h4z05: begin     //4x01
                opUCmd=UCMD_ALU_ROTR;   tOpDecXfrm=UXFORM_N;
            end
            16'h4z15: begin     //4x11
                opUCmd=opPsDQ ? UCMD_CMPQ_GT : UCMD_CMP_GT;
                tOpDecXfrm=UXFORM_M;
            end
            16'h4z25: begin     //4x21
                opUCmd=UCMD_ALU_ROTCR;  tOpDecXfrm=UXFORM_N;
            end

        16'h4zz6: begin     //4xx6
            opUCmd = opJQ ? UCMD_MOVQ_MR : UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_RS;
        end
        16'h4zz7: begin     //4xx7
            opUCmd = opJQ ? UCMD_MOVQ_RM : UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_MOV_NSDEC;
            tOpDecXfrmZx=UXFORMZX_RC;
        end

        /* 4xx8 */
            16'h4z08: begin     //4x08
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=2;
            end
            16'h4z18: begin     //4x18
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=8;
            end
            16'h4z28: begin     //4x28
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=16;
            end

        /* 4xx9 */
            16'h4z09: begin     //4x09
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=-2;
            end
            16'h4z19: begin     //4x19
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=-8;
            end
            16'h4z29: begin     //4x29
                opUCmd=UCMD_ALU_SHLD;   tOpDecXfrm=UXFORM_N_C;
                opImm=-16;
            end

        16'h4zzA: begin     //4xxA, LDS
            opUCmd=UCMD_MOV_RR;     tOpDecXfrm=UXFORM_ARI_NS;
            tOpDecXfrmZx=UXFORMZX_RS;
        end

        /* 4xxB */
            16'h4z0B: begin
                opUCmd=UCMD_JSR;    tOpDecXfrm=UXFORM_M;
            end

            16'h4z2B: begin
                opUCmd=UCMD_JMP;    tOpDecXfrm=UXFORM_M;
            end
            16'h4z3B: begin
            end
            16'h4z4B: begin
                opUCmd=UCMD_JSRN;   tOpDecXfrm=UXFORM_M;
            end

        16'h4zzC: begin     //4xxC
            opUCmd=opPsDQ ? UCMD_ALU_SHADQ : UCMD_ALU_SHAD;
            tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_SX;
        end
        16'h4zzD: begin     //4xxD
            opUCmd=opPsDQ ? UCMD_ALU_SHLDQ : UCMD_ALU_SHLD;
            tOpDecXfrm=UXFORM_ARI_NST;
            tOpDecXfrmZx=UXFORMZX_SX;
        end
        16'h4zzE: begin     //4xxE, LDC
            if(isOpXE)  begin
                case(opCmdWord[7:4])
                4'h0: begin
                    opUCmd=UCMD_MOVUB_MR;   tOpDecXfrm=UXFORM_NST_8E;
                end
                4'h1: begin
                    opUCmd=UCMD_MOVUW_MR;   tOpDecXfrm=UXFORM_NST_8E;
                end

                default: begin end
                endcase
            end
            else
            begin
                opUCmd=UCMD_MOV_RR;     tOpDecXfrm=UXFORM_ARI_NS;
                tOpDecXfrmZx=UXFORMZX_RC;
            end
        end

        16'h5zzz: begin     //5xxx
            opUCmd = opPlDQ ? UCMD_MOVQ_MR : UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_MOV_NSJ;
        end

        16'h6zz0: begin     //6xx0
            opUCmd=UCMD_MOVB_MR;    tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h6zz1: begin     //6xx1
            opUCmd = opPwDQ ? UCMD_MOVQ_MR : UCMD_MOVW_MR;
            tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h6zz2: begin     //6xx2
            opUCmd = opPlDQ ? UCMD_MOVQ_MR : UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_MOV_NS;
        end
        16'h6zz3: begin     //6xx3
            if(isOpXE)  begin
                opUCmd=UCMD_MOVQ_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_MOV_RR;     tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zz4: begin     //6xx4
            if(isOpXE) begin
                opUCmd=UCMD_LEAB_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
            end else begin
                opUCmd=UCMD_MOVB_MR;    tOpDecXfrm=UXFORM_MOV_NSDEC;
                tOpDecXfrmZx=UXFORMZX_PINC;
            end
        end
        16'h6zz5: begin     //6xx5
            if(isOpXE)  begin
                opUCmd=UCMD_LEAW_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
            end else begin
                opUCmd = opPwDQ ? UCMD_MOVQ_MR : UCMD_MOVW_MR;
                tOpDecXfrm=UXFORM_MOV_NSDEC;
                tOpDecXfrmZx=UXFORMZX_PINC;
            end
        end
        16'h6zz6: begin     //6xx6
            if(isOpXE)  begin
                opUCmd=UCMD_LEAL_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
            end else begin
                opUCmd =  opPlDQ ? UCMD_MOVQ_MR : UCMD_MOVL_MR;
                tOpDecXfrm=UXFORM_MOV_NSDEC;
                tOpDecXfrmZx=UXFORMZX_PINC;
            end
        end
        16'h6zz7: begin
            if(isOpXE)  begin
                opUCmd=UCMD_LEAQ_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
            end else begin
                opUCmd=UCMD_ALU_NOT;    tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zz8: begin
            if(isOpXE)  begin
                opUCmd=UCMD_LEAB_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_SWAPB;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zz9: begin
            if(isOpXE)  begin
                opUCmd=UCMD_LEAW_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_SWAPW;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzA: begin
            if(isOpXE)  begin
                opUCmd=UCMD_LEAL_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_NEGC;   tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzB: begin
            if(isOpXE)  begin
                opUCmd=UCMD_LEAQ_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_NEG;    tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzC: begin
            if(isOpXE)  begin
                opUCmd=UCMD_MOVUB_MR;   tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_EXTUB;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzD: begin
            if(isOpXE)  begin
                opUCmd=UCMD_MOVUW_MR;   tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_EXTUW;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzE: begin
            if(isOpXE)  begin
                opUCmd=UCMD_MOVUL_MR;   tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_EXTSB;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end
        16'h6zzF: begin
            if(isOpXE)  begin
                opUCmd=UCMD_MOVQ_MR;    tOpDecXfrm=UXFORM_MOV_NS;
            end else begin
                opUCmd=UCMD_ALU_EXTSW;  tOpDecXfrm=UXFORM_ARI_NS;
            end
        end

        16'h7zzz: begin     //7xxx
            opUCmd=UCMD_ALU_ADD;    tOpDecXfrm=UXFORM_ARI_NNI;
        end

        16'h80zz: begin     //80xx
            opUCmd=UCMD_MOVB_RM;
            tOpDecXfrm=UXFORM_MOV_SP4RN;
            tOpDecXfrmZx=UXFORMZX_RM0;
        end
        16'h81zz: begin     //81xx
            opUCmd=UCMD_MOVW_RM;
            tOpDecXfrm=UXFORM_MOV_SP4RN;
            tOpDecXfrmZx=UXFORMZX_RM0;
        end

        16'h82zz: begin     //82xx
            opUCmd=UCMD_BRAN;       tOpDecXfrm=UXFORM_BR_D8;
        end
        16'h83zz: begin     //83xx
            if(isOpXE)  begin
                opUCmd=UCMD_BSRN;   tOpDecXfrm=UXFORM_BR_D8;
            end else begin
                tOpDecXfrm=UXFORM_MOV_SP4RN;
                if(opCmdWord[7])
                begin
                    opUCmd=UCMD_MOVL_MR;
                    tOpDecXfrmZx=UXFORMZX_MR3;
                end else begin
                    opUCmd=UCMD_MOVL_RM;
                    tOpDecXfrmZx=UXFORMZX_RM3;
                end
            end
        end

        16'h84zz: begin     //84xx
            opUCmd=UCMD_MOVB_MR;
            tOpDecXfrm=UXFORM_MOV_SP4RN;
            tOpDecXfrmZx=UXFORMZX_MR0;
        end
        16'h85zz: begin     //85xx
            opUCmd=UCMD_MOVW_MR;
            tOpDecXfrm=UXFORM_MOV_SP4RN;
            tOpDecXfrmZx=UXFORMZX_MR0;
        end

        16'h86zz: begin     //86xx
            if(isOpXE)  begin
//              opUCmd=UCMD_BSRN;   tOpDecXfrm=UXFORM_BR_D8;
            end else begin
                tOpDecXfrm=UXFORM_MOV_SP4RN;
                if(opCmdWord[7])
                begin
                    opUCmd=UCMD_MOVL_MR;
                    tOpDecXfrmZx=UXFORMZX_MF3;
                end else begin
                    opUCmd=UCMD_MOVL_RM;
                    tOpDecXfrmZx=UXFORMZX_FM3;
                end
            end
        end

        16'h87zz: begin     //87xx
        end

        16'h88zz: begin     //88xx
            opUCmd=UCMD_CMP_EQ;
            tOpDecXfrm=UXFORM_ARI_I8R0;
        end
        16'h89zz: begin     //89xx
            opUCmd=UCMD_BT;     tOpDecXfrm=UXFORM_BR_D8;
        end
        16'h8Azz: begin     //8Axx-xxxx
            if(isOpXE)  begin
    //          opUCmd=UCMD_BSRN;   tOpDecXfrm=UXFORM_BR_D8;
            end else begin
                opRegN=UREG_R0;
                opUCmd=UCMD_MOV_RI;
                tOpDecXfrm=UXFORM_CST;
            end
        end
        16'h8Bzz: begin     //8Bxx, BF disp
            opUCmd=UCMD_BF;     tOpDecXfrm=UXFORM_BR_D8;
        end
        16'h8Czz: begin     //8Cxx
            /* Escape */
        end
        16'h8Dzz: begin     //8Dxx, BTS disp
            opUCmd=UCMD_BTS;        tOpDecXfrm=UXFORM_BR_D8;
        end
        16'h8Ezz: begin     //8Exx
            /* Escape */
        end
        16'h8Fzz: begin     //8Fxx, BFS disp
            opUCmd=UCMD_BFS;        tOpDecXfrm=UXFORM_BR_D8;
        end

        16'h9zzz: begin     //9xxx
            if(isOpXE)
            begin           //LDSH16 #imm, Rn
                opUCmd=UCMD_ALU_LDSH16;
                tOpDecXfrm=UXFORM_ARI_NNI;
            end else begin  //MOV.W @(PC, disp), Rn
                opRegN[3:0]=opCmdWord[11:8];
                opRegS=UREG_PCW;
                opRegT=UREG_ZZR;
                opImm[7:0]=opCmdWord[ 7:0];
                opUCmd=UCMD_MOVW_MR;
                tOpDecXfrm=UXFORM_CST;
            end
        end

        16'hAzzz: begin     //Axxx
            opUCmd=UCMD_BRA;        tOpDecXfrm=UXFORM_BR_D12;
        end

        16'hBzzz: begin     //Bxxx
            opUCmd=UCMD_BSR;        tOpDecXfrm=UXFORM_BR_D12;
        end

        16'hC0zz: begin
            if(opJQ)
            begin
                opUCmd=UCMD_MOVQ_RM;
                tOpDecXfrm=UXFORM_MOV_SP4RN;
                tOpDecXfrmZx=UXFORMZX_RM;
            end else begin
                opUCmd=UCMD_MOVB_RM;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_RM;
            end
        end

        16'hC1zz: begin
            if(opJQ)
            begin
            end else begin
                opUCmd=UCMD_MOVW_RM;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_RM;
            end
        end

        16'hC2zz: begin
            if(opJQ)
            begin
            end else begin
                opUCmd=UCMD_MOVL_RM;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_RM;
            end
        end

        16'hC4zz: begin
            if(opJQ)
            begin
                opUCmd=UCMD_MOVQ_MR;
                tOpDecXfrm=UXFORM_MOV_SP4RN;
                tOpDecXfrmZx=UXFORMZX_MR;
            end else begin
                opUCmd=UCMD_MOVB_MR;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_MR;
            end
        end

        16'hC5zz: begin
            if(opJQ)
            begin
            end else begin
                opUCmd=UCMD_MOVW_MR;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_MR;
            end
        end

        16'hC6zz: begin
            if(opJQ)
            begin
            end else begin
                opUCmd=UCMD_MOVL_MR;
                tOpDecXfrm=UXFORM_MOV_GD8R0;
                tOpDecXfrmZx=UXFORMZX_MR;
            end
        end

        16'hC8zz: begin     //CMP/EQ #imm, R0
            opUCmd=opPsDQ ? UCMD_CMPQ_TST : UCMD_CMP_TST;
            tOpDecXfrm=UXFORM_CMP_I8R0;
        end
        16'hC9zz: begin     //AND #imm, R0
            opUCmd=UCMD_ALU_AND;    tOpDecXfrm=UXFORM_ARI_I8R0;
        end
        16'hCAzz: begin     //XOR #imm, R0
            opUCmd=UCMD_ALU_XOR;    tOpDecXfrm=UXFORM_ARI_I8R0;
        end
        16'hCBzz: begin     //OR #imm, R0
            opUCmd=UCMD_ALU_OR;     tOpDecXfrm=UXFORM_ARI_I8R0;
        end

        16'hDzzz: begin     //Dxxx, MOV @(PC,disp), Rn
            opRegN[3:0]=opCmdWord[11:8];
            opRegS=UREG_PCL;
            opRegT=UREG_ZZR;
            opImm[7:0]=opCmdWord[ 7:0];
            opUCmd=UCMD_MOVL_MR;
            tOpDecXfrm=UXFORM_CST;
        end

        16'hEzzz: begin     //Exxx, MOV #imm, Rn
            opUCmd=UCMD_MOV_RI;
            tOpDecXfrm=UXFORM_ARI_NNI;
        end

        16'hFzz0: begin
            opUCmd=UCMD_FPU_ADD;
            tOpDecXfrm=UXFORM_FPARI_NS;
//          tOpDecXfrmZx=UXFORMZX_FF;
        end
        16'hFzz1: begin
            opUCmd=UCMD_FPU_SUB;
            tOpDecXfrm=UXFORM_FPARI_NS;
//          tOpDecXfrmZx=UXFORMZX_FF;
        end
        16'hFzz2: begin
            opUCmd=UCMD_FPU_MUL;
            tOpDecXfrm=UXFORM_FPARI_NS;
//          tOpDecXfrmZx=UXFORMZX_FF;
        end

        16'hFzz4: begin
            opUCmd=UCMD_FPU_CMPEQ;
            tOpDecXfrm=UXFORM_FPARI_NS;
//          tOpDecXfrmZx=UXFORMZX_FF;
        end
        16'hFzz5: begin
            opUCmd=UCMD_FPU_CMPGT;
            tOpDecXfrm=UXFORM_FPARI_NS;
//          tOpDecXfrmZx=UXFORMZX_FF;
        end

        16'hFzz6: begin
            opUCmd=UCMD_MOVL_MR;    tOpDecXfrm=UXFORM_MOV_NSO;
            tOpDecXfrmZx=UXFORMZX_RF;
        end
        16'hFzz7: begin
            opUCmd=UCMD_MOVL_RM;    tOpDecXfrm=UXFORM_MOV_NSO;
            tOpDecXfrmZx=UXFORMZX_FR;
        end

        16'hFzz8: begin
            opUCmd=UCMD_MOVL_MR;    tOpDecXfrm=UXFORM_MOV_NS;
//          opIsRegN_FR=1;
            tOpDecXfrmZx=UXFORMZX_RF;
        end
        16'hFzz9: begin
            opUCmd=UCMD_MOVL_MR;    tOpDecXfrm=UXFORM_MOV_NSDEC;
//          opIsRegN_FR=1;
            tOpDecXfrmZx=UXFORMZX_RFI;
        end

        16'hFzzA: begin
            opUCmd=UCMD_MOVL_RM;    tOpDecXfrm=UXFORM_MOV_NS;
//          opIsRegM_FR=1;
            tOpDecXfrmZx=UXFORMZX_FR;
        end
        16'hFzzB: begin
//          opUCmd=UCMD_MOVL_RM;    tOpDecXfrm=UXFORM_MOV_NSDEC;
            opIsRegM_FR=1;
            tOpDecXfrmZx=UXFORMZX_FRD;
        end

        default: begin end

    endcase

//  opIsRegN_FR=0;
//  opIsRegM_FR=0;
//  opIsRegS_FR=0;
//  opIsRegT_FR=0;
//  opIsRegM_CR=0;
//  opIsRegM_SR=0;


    if(decEnable64A)
    begin
/*
        opRegN_Dfl  = {opIsRegN_FR?2'b10:2'b00, opCCe[2],    opCmdWord[11:8]};
        opRegN_CEf  = {opIsRegN_FR?2'b10:2'b00, opPfxImm[7], opCmdWord[11:8]};
        opRegN_CEe  = {opIsRegN_FR?2'b10:2'b00, opPfxImm[6], opCmdWord[11:8]};

        opRegM_Dfl  = {opIsRegM_FR?2'b10:2'b00, opCCe[1],    opCmdWord[ 7:4]};
        opRegM_CEf  = {opIsRegM_FR?2'b10:2'b00, opPfxImm[6], opCmdWord[ 7:4]};
        opRegS_CEe  = {opIsRegM_FR?2'b10:2'b00, opPfxImm[5], opCmdWord[ 7:4]};

        opRegT_CEe  = {opIsRegT_FR?2'b10:2'b00, opPfxImm[4], opPfxImm [ 3:0]};
*/

        opRegN_Dfl  = {2'b00, opCCe[2],    opCmdWord[11:8]};
        opRegN_CEf  = {2'b00, opPfxImm[7], opCmdWord[11:8]};
        opRegN_CEe  = {2'b00, opPfxImm[6], opCmdWord[11:8]};

        opRegM_Dfl  = {2'b00, opCCe[1],    opCmdWord[ 7:4]};
        opRegM_CEf  = {2'b00, opPfxImm[6], opCmdWord[ 7:4]};
        opRegM_CEe  = {2'b00, opPfxImm[5], opCmdWord[ 7:4]};

        opRegO_CEe  = {2'b00, opPfxImm[4], opCmdWord[ 3:0]};

        opRegT_CEe  = {2'b00, opPfxImm[4], opPfxImm [ 3:0]};

        opRegO_Dfl  = {2'b00, opCCe[0],    opCmdWord[ 3:0]};

        opImm6_SxCE = {opPfxImm[5] ? 26'h3FFFFFF : 26'h0, opPfxImm [ 5:0]};
        opImm6_ZxCE = {26'h000000, opPfxImm [ 5:0]};
        opImm6_NxCE = {26'hFFFFFF, opPfxImm [ 5:0]};

    end
    else
    begin
//      opRegN_Dfl  = {opIsRegN_FR?3'b100:3'b000, opCmdWord[11:8]};
//      opRegM_Dfl  = {opIsRegM_FR?3'b100:3'b000, opCmdWord[ 7:4]};

        opRegN_Dfl  = {3'b000, opCmdWord[11:8]};
        opRegM_Dfl  = {3'b000, opCmdWord[ 7:4]};
        opRegO_Dfl  = {3'b000, opCmdWord[ 3:0]};

//      opRegN_CEf  = 7'hXX;
//      opRegM_CEf  = 7'hXX;
        opRegN_CEf  = opRegN_Dfl;
        opRegM_CEf  = opRegM_Dfl;

        opRegN_CEe  = 7'hXX;
        opRegM_CEe  = 7'hXX;
        opRegO_CEe  = 7'hXX;
        opRegT_CEe  = 7'hXX;
    end

/*
    if(opIsRegM_CR)
    begin
        if(opCmdWord[11])   //RmB
            opRegM_Dfl={3'h2, 1'b0, opCmdWord[6:4]};
        else
            opRegM_Dfl={3'h7, opCmdWord[7:4]};
    end else if(opIsRegM_SR)
    begin
        opRegM_Dfl={3'h6, opCmdWord[7:4]};
    end
*/

// /*
    if(opCmdWord[11])   //RmB
        opRegM_CR={3'h2, 1'b0, opCmdWord[6:4]};
    else
        opRegM_CR={3'h7, opCmdWord[7:4]};

    opRegM_SR={3'h6, opCmdWord[7:4]};
// */

    opRegN_FR   = {3'h4, opCmdWord[11:8]};
    opRegM_FR   = {3'h4, opCmdWord[ 7:4]};
    opRegO_FR   = {3'h4, opCmdWord[ 3:0]};

    if(decEnableBJX1)
    begin
//      opRegS_8E       = {opIsRegS_FR?3'b100:3'b000, opPfxImm [ 7:4]};
//      opRegT_8E       = {opIsRegT_FR?3'b100:3'b000, opPfxImm [ 3:0]};
        opRegS_8E       = {3'b000, opPfxImm [ 7:4]};
        opRegT_8E       = {3'b000, opPfxImm [ 3:0]};

        opRegS_FR   = {3'h4, opPfxImm [ 7:4]};
        opRegT_FR   = {3'h4, opPfxImm [ 3:0]};

        opImm_Zx4_8E    = {28'h0, opPfxImm [ 3:0]};

        opImm_Sx8E  = {opPfxImm[7] ? 24'hFFFFFF : 24'h0, opPfxImm [ 7:0]};
        opImm_Zx8E  = {24'h000000, opPfxImm [ 7:0]};
        opImm_Nx8E  = {24'hFFFFFF, opPfxImm [ 7:0]};

        opImmM_Sx12_8E  = {opPfxImm[7] ? 20'hFFFFF : 20'h0,
            opPfxImm [ 7:0], opCmdWord [ 7:4]};
        opImmO_Sx12_8E  = {opPfxImm[7] ? 20'hFFFFF : 20'h0,
            opPfxImm [ 7:0], opCmdWord [ 3:0]};

        opImm_Sx16_8E   = {opPfxImm[7] ? 16'hFFFF : 16'h0000,
            opPfxImm [ 7:0], opCmdWord [ 7:0]};
        opImm_Sx20_8E   = {opPfxImm[7] ? 12'hFFF : 12'h000,
            opPfxImm [ 7:0], opCmdWord [11:0]};

        opRegN_N3 = (opCmdWord[6:4]==3'b111) ? UREG_R0 :
            {3'h0, 1'b1, opCmdWord[6:4]};
        opRegM_N3 = (opCmdWord[2:0]==3'b111) ? UREG_R0 :
            {3'h0, 1'b1, opCmdWord[2:0]};
    end
    else
    begin
        opRegS_8E       = 7'hXX;            opRegT_8E       = 7'hXX;
        opRegS_FR       = 7'hXX;            opRegT_FR       = 7'hXX;
        opImm_Zx4_8E    = 32'hXXXXXXXX;     opImm_Sx8E      = 32'hXXXXXXXX;
        opImm_Zx8E      = 32'hXXXXXXXX;     opImm_Nx8E      = 32'hXXXXXXXX;
        opImm_Sx16_8E   = 32'hXXXXXXXX;     opImm_Sx20_8E   = 32'hXXXXXXXX;
        opImmM_Sx12_8E  = 32'hXXXXXXXX;     opImmO_Sx12_8E  = 32'hXXXXXXXX;

        opRegN_N3=UREG_XX;      opRegM_N3=UREG_XX;
    end

    opImm_Zx4   = {28'h0, opCmdWord[ 3:0]};
    opImm_Zx8   = {24'h0, opCmdWord[ 7:0]};
    opImm_Sx8   = {opCmdWord[ 7] ? 24'hFFFFFF : 24'h000000, opCmdWord [ 7:0]};
    opImm_Sx12  = {opCmdWord[11] ? 20'hFFFFF  : 20'h00000 , opCmdWord [11:0]};

    case(tOpDecXfrm)

        UXFORM_CST: begin
        end

        UXFORM_N: begin
            opRegN=opRegN_Dfl;
            opRegS=opRegN;
        end

        UXFORM_MOV_NS: begin
            if(isOpCE)
            begin
                opRegN = opRegN_CEf;    opRegS = opRegM_CEf;
                opImm  = opImm6_ZxCE;
            end else if(isOp8E)
            begin
                opRegN  = opRegN_Dfl;   opRegS  = opRegM_Dfl;
                opImm   = opImm_Sx8E;
            end else begin
                opRegN=opRegN_Dfl;      opRegS=opRegM_Dfl;
            end
//          if(tOpDecXfrmZx==UXFORMZX_RF)   opRegN[6:5]=2'b10;
//          if(tOpDecXfrmZx==UXFORMZX_FR)   opRegS[6:5]=2'b10;
        end

        UXFORM_MOV_NSO: begin
            if(isOpCE)
            begin
                opRegN=opRegN_CEe;  opRegS=opRegM_CEe;
                opRegT=opRegT_CEe;  opImm=0;
            end else if(isOp8E)
            begin
                opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                opRegT=opRegS_8E;   opImm=opImm_Zx4_8E;
            end else begin
                opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                opRegT=UREG_R0;     opImm=0;
            end
//          if(tOpDecXfrmZx==UXFORMZX_RF)   opRegN[6:5]=2'b10;
//          if(tOpDecXfrmZx==UXFORMZX_FR)   opRegS[6:5]=2'b10;
        end

        UXFORM_MOV_NSJ: begin
            if(isOpCE)
            begin
                opRegN = opRegN_CEe;
                opRegS = opRegM_CEe;
                opRegT = opRegO_CEe;
                opImm  = opImm_Zx4_8E;
            end else if(isOp8E)
            begin
                opRegN = opRegN_Dfl;    opRegS = opRegM_Dfl;
                opRegT = opRegO_Dfl;    opImm  = opImm_Sx8E;
            end else begin
                opRegN=opRegN_Dfl;      opRegS=opRegM_Dfl;
                opImm  = opImm_Zx4;
            end
//          if(tOpDecXfrmZx==UXFORMZX_RF)   opRegN[6:5]=2'b10;
//          if(tOpDecXfrmZx==UXFORMZX_FR)   opRegS[6:5]=2'b10;
        end

        UXFORM_MOV_NSDEC: begin
            case(tOpDecXfrmZx)
                UXFORMZX_PDEC: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                    opRegT=UREG_MR_MEMDEC;
                end

                UXFORMZX_PINC: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                    opRegT=UREG_MR_MEMINC;
                end

// /*
                UXFORMZX_FRD: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_FR;
                    opRegT=UREG_MR_MEMDEC;
                end
                UXFORMZX_RFI: begin
                    opRegN=opRegN_FR;   opRegS=opRegM_Dfl;
                    opRegT=UREG_MR_MEMINC;
                end

                UXFORMZX_RS: begin
                    opRegN=opRegM_SR;   opRegS=opRegN_Dfl;
                    opRegT=UREG_MR_MEMINC;
                end
                UXFORMZX_RC: begin
                    opRegN=opRegM_CR;   opRegS=opRegN_Dfl;
                    opRegT=UREG_MR_MEMINC;
                end

                UXFORMZX_SR: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_SR;
                    opRegT=UREG_MR_MEMDEC;
                end
                UXFORMZX_CR: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_CR;
                    opRegT=UREG_MR_MEMDEC;
                end
// */

                default: begin
                    opRegN=UREG_XX;     opRegS=UREG_XX;
                    opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
                end

            endcase

        end

        UXFORM_FPARI_NS: begin
            opRegN=opRegN_FR;
            opRegS=opRegM_FR;
        end

        UXFORM_ARI_NS: begin
//          opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;

//          /*
            case(tOpDecXfrmZx)
                UXFORMZX_RR: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                end

                UXFORMZX_FF: begin
                    opRegN=opRegN_FR;   opRegS=opRegM_FR;
                end

                UXFORMZX_RS: begin
                    opRegN=opRegM_SR;   opRegS=opRegN_Dfl;
                end
                UXFORMZX_RC: begin
                    opRegN=opRegM_CR;   opRegS=opRegN_Dfl;
                end

                UXFORMZX_SR: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_SR;
                end
                UXFORMZX_CR: begin
                    opRegN=opRegN_Dfl;  opRegS=opRegM_CR;
                end

                default: begin
                    opRegN=UREG_XX;     opRegS=UREG_XX;
                    opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
                end

            endcase
//          */
        end

        UXFORM_ARI_NST: begin
            if(isOpCE)
            begin
                opRegN=opRegN_CEf;  opRegS=opRegM_CEf;
                opRegT=UREG_MR_IMM;
                case(tOpDecXfrmZx)
                    UXFORMZX_SX: opImm=opImm6_SxCE;
                    UXFORMZX_ZX: opImm=opImm6_ZxCE;
                    UXFORMZX_NX: opImm=opImm6_NxCE;
                    default: begin end
                endcase

            end else if(isOp8E)
            begin
                opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
                opRegT=UREG_MR_IMM;
                case(tOpDecXfrmZx)
                    UXFORMZX_SX: opImm=opImm_Sx8E;
                    UXFORMZX_ZX: opImm=opImm_Zx8E;
                    UXFORMZX_NX: opImm=opImm_Nx8E;
                    default: begin end
                endcase
            end else begin
                opRegN=opRegN_Dfl;  opRegS=opRegN_Dfl;  opRegT=opRegM_Dfl;
            end
        end

        UXFORM_CMP_ST: begin
            if(isOp8E)
            begin
                opRegS=opRegN_Dfl;  opRegT=UREG_MR_IMM;
                opImm=opImmM_Sx12_8E;
            end else begin
                opRegS=opRegN_Dfl;  opRegT=opRegM_Dfl;
            end
        end

        UXFORM_ARI_ST: begin
            opRegN=opRegN_Dfl;  opRegS=opRegM_Dfl;
        end

        UXFORM_ARI_NNI: begin
            if(isOpXE)
            begin
                opRegN={2'h0, isOpCE, opCmdWord[11:8]};
                opRegS=opRegN;
                opRegT=UREG_MR_IMM; opImm=opImm_Sx16_8E;
            end else begin
                opRegN=opRegN_Dfl;  opRegS=opRegN_Dfl;
                opRegT=UREG_MR_IMM; opImm=opImm_Sx8;
            end
        end

        UXFORM_BR_D8: begin
            opImm = isOpXE ? opImm_Sx16_8E : opImm_Sx8;
        end
        UXFORM_BR_D12: begin
            opImm = isOpXE ? opImm_Sx20_8E : opImm_Sx12;
        end

        UXFORM_ARI_I8R0: begin
            if(isOpXE)
            begin
                opRegN=opRegM_Dfl;  opRegS=opRegN;
                opRegT=UREG_MR_IMM; opImm=opImmO_Sx12_8E;
            end else begin
                opRegN=UREG_R0;     opRegS=UREG_R0;
                opRegT=UREG_MR_IMM; opImm=opImm_Zx8;
            end
        end

        UXFORM_N_C: begin
            opRegN=opRegN_Dfl;  opRegS=opRegN_Dfl;
            opRegT=UREG_MR_IMM;
        end

        UXFORM_MOV_GD8R0: begin
            case(tOpDecXfrmZx)
                UXFORMZX_RM: begin
                    opRegN=UREG_GBR;    opRegS=UREG_R0;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx8;
                end
                UXFORMZX_MR: begin
                    opRegN=UREG_R0;     opRegS=UREG_GBR;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx8;
                end

                default: begin
                    opRegN=UREG_XX;     opRegS=UREG_XX;
                    opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
                end
            endcase
        end

        UXFORM_MOV_SP4RN: begin
            case(tOpDecXfrmZx)
                UXFORMZX_RM: begin
                    opRegN=UREG_R15;    opRegS=opRegM_Dfl;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end
                UXFORMZX_MR: begin
                    opRegN=opRegM_Dfl;  opRegS=UREG_R15;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end

// /*
                UXFORMZX_RM3: begin
                    opRegN=UREG_R15;    opRegS=opRegN_N3;
                    opRegT=UREG_MR_IMM;
                    opImm[3:0]=opCmdWord[3:0];
                    opImm[31:4]=1;
                end
                UXFORMZX_MR3: begin
                    opRegN=opRegN_N3;   opRegS=UREG_R15;
                    opRegT=UREG_MR_IMM;
                    opImm[3:0]=opCmdWord[3:0];
                    opImm[31:4]=1;
                end

                UXFORMZX_FM3: begin
                    opRegN=UREG_R15;
                    opRegS={3'h4, 1'b1, opCmdWord[6:4]};
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end
                UXFORMZX_MF3: begin
                    opRegN={3'h4, 1'b1, opCmdWord[6:4]};
                    opRegS=UREG_R15;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end
// */

                UXFORMZX_RM0: begin
                    opRegN=opRegM_Dfl;  opRegS=UREG_R0;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end
                UXFORMZX_MR0: begin
                    opRegN=UREG_R0;     opRegS=opRegM_Dfl;
                    opRegT=UREG_MR_IMM; opImm=opImm_Zx4;
                end

                default: begin
                    opRegN=UREG_XX;     opRegS=UREG_XX;
                    opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
                end
            endcase
        end

        UXFORM_NST_8E: begin
//          opRegN=opRegN_Dfl;
//          opRegS=opRegS_8E;
//          opRegT=opRegT_8E;

// /*
            case(tOpDecXfrmZx)
                UXFORMZX_RR: begin
                    opRegN=opRegN_Dfl;
                    opRegS=opRegS_8E;
                    opRegT=opRegT_8E;
                end

                UXFORMZX_FF: begin
                    opRegN=opRegN_FR;
                    opRegS=opRegS_FR;
                    opRegT=opRegT_FR;
                end

                default: begin
                    opRegN=UREG_XX;     opRegS=UREG_XX;
                    opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
                end
            endcase
// */
        end

        default: begin
            opRegN=UREG_XX;     opRegS=UREG_XX;
            opRegT=UREG_XX;     opImm=32'hXXXXXXXX;
        end
    endcase

//  if(opIsRegN_FR)
//      opRegN[6:5]=2'b10;
//  if(opIsRegM_FR || opIsRegS_FR)
//      opRegS[6:5]=2'b10;
//  if(opIsRegT_FR)
//      opRegT[6:5]=2'b10;

end

endmodule