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module sub86( CLK, RSTN, IA, ID, A, D, Q, WEN,BEN );
input         CLK;
input         RSTN;
output [31:0] IA;
input  [15:0] ID;
output [31:0] A;
input  [31:0] D;
output [31:0] Q;
output        WEN;
output  [1:0] BEN;
wire          nncry,neqF,ngF,nlF;
reg    [31:0] EAX,EBX,ECX,EDX,EBP,ESP,PC,regsrc,regdest,alu_out;
reg           eqF,gF,lF;
reg     [4:0] state,nstate;
reg     [2:0] src,dest;
reg           cry,ncry,prefx,nprefx,cmpr;
wire   [31:0] incPC,Sregsrc,Zregsrc,pc_jg,pc_jge,pc_jl,pc_jle,pc_eq,pc_jp,pc_neq;
wire   [63:0] mul_out;
wire signed [31:0] sft_in,sft_out,tst;
wire    [4:0] shtr;
wire   [32:0] adder_out;
wire   [32:0] sub_out;
`define fetch 5'b00000
`define jmp   5'b00001
`define jmp2  5'b00010
`define jge   5'b00011
`define jge2  5'b00100
`define imm   5'b00101
`define imm2  5'b00110
`define lea   5'b00111
`define lea2  5'b01000
`define call  5'b01001
`define call2 5'b01010
`define ret   5'b01011
`define ret2  5'b01100
`define imul  5'b01101
`define shift 5'b01110
`define jg    5'b01111
`define jg2   5'b10000
`define jl    5'b10001
`define jl2   5'b10010
`define jle   5'b10011
`define jle2  5'b10100
`define je    5'b10101
`define je2   5'b10110
`define jne   5'b10111
`define jne2  5'b11000
 always @(posedge CLK or negedge RSTN)
   if(!RSTN) begin
      EAX <= 32'b0; EBX <= 32'b0;
      ECX <= 32'b0; EDX <= 32'b0;
      EBP <= 32'b0; ESP <= 32'b011111111;
      PC  <= 32'b00000;
      eqF <= 1'b0; lF <= 1'b0; gF <= 1'b0;
      state <=5'b00000; prefx <= 1'b0;
      cry <= 1'b0;
      end
   else
      begin
       state <= nstate; prefx <= nprefx; cry <= ncry;
       case (cmpr)
        1'b1   : begin eqF <= neqF ; lF <= nlF; gF <= ngF; end
        default: begin eqF <=  eqF ; lF <=  lF; gF <=  gF; end
       endcase
       if ((state==`fetch) || (state==`ret))
        begin
         if (dest==3'b000) EAX <= alu_out; else EAX<=EAX;
         if (dest==3'b001) ECX <= alu_out; else ECX<=ECX;
         if (dest==3'b010) EDX <= alu_out; else EDX<=EDX;
         if (dest==3'b011) EBX <= alu_out; else EBX<=EBX;
         if (dest==3'b100) ESP <= alu_out; else ESP<=ESP;
         if (dest==3'b101) EBP <= alu_out; else EBP<=EBP;
        end
       else
        begin
         EBP<=EBP;
         EAX<=EAX;
         ECX<=ECX;
         EDX<=EDX;
         case(state)
          `jmp , `jg, `jge , `jl, `jle, `je, `jne, `imm, `call,
          `lea    : EBX<={EBX[31:16],ID[7:0],ID[15:8]};
          `imm2   : EBX<={ID[7:0],ID[15:8], EBX[15:0]};
          `lea2   : EBX<={ID[7:0],ID[15:8], EBX[15:0]}+EBP;
          default : EBX<=EBX;
         endcase
         case(state)
          `call  : ESP<=ESP - 4'b0100;
          `ret2  : ESP<=ESP + 4'b0100;
          default: ESP<=ESP;
         endcase
        end
       case(state)
        `jge2              : PC<=pc_jge;
        `jle2              : PC<=pc_jle;
        `jg2               : PC<=pc_jg ;
        `jl2               : PC<=pc_jl ;
        `je2               : PC<=pc_eq ;
        `jne2              : PC<=pc_neq;
        `jmp2,`call2       : PC<=pc_jp ;
        `ret2              : PC<=D     ;
        default            : PC<=incPC ;
       endcase
      end
// muxing for source selection, used in alu & moves
always@(src,EAX,ECX,EDX,EBX,ESP,EBP,D)
   case(src)
    3'b000 : regsrc = EAX;
    3'b001 : regsrc = ECX;
    3'b010 : regsrc = EDX;
    3'b011 : regsrc = EBX;
    3'b100 : regsrc = ESP;
    3'b101 : regsrc = EBP;
    3'b111 : regsrc = D;
    default: regsrc = EBX;
   endcase
// muxing for 2nd operand selection, used in alu only
always@(dest,EAX,ECX,EDX,EBX,ESP,EBP,D)
   case(dest)
    3'b000 : regdest = EAX;
    3'b001 : regdest = ECX;
    3'b010 : regdest = EDX;
    3'b011 : regdest = EBX;
    3'b100 : regdest = ESP;
    3'b101 : regdest = EBP;
    3'b111 : regdest = D  ;
    default: regdest = EBX;
   endcase
// alu
always@(regdest,regsrc,ID,cry,mul_out,Zregsrc,Sregsrc,sft_out)
 begin
  case (ID[15:10])
   6'b000000 : {ncry,alu_out} =             adder_out ; // ADD , carry generation
   6'b000010 : {ncry,alu_out} = {cry,regdest | regsrc}; // OR
   6'b000100 : {ncry,alu_out} =             adder_out ; // ADD , carry use
   6'b000110 : {ncry,alu_out} =               sub_out ; // SUB , carry use
   6'b001000 : {ncry,alu_out} = {cry,regdest & regsrc}; // AND
   6'b001010 : {ncry,alu_out} =               sub_out ; // SUB , carry generation
   6'b001100 : {ncry,alu_out} = {cry,regdest ^ regsrc}; // XOR
   6'b100010 : {ncry,alu_out} = {cry,          regsrc}; // MOVE
   6'b101101 : {ncry,alu_out} = {cry,         Zregsrc}; // MOVE
   6'b101111 : {ncry,alu_out} = {cry,         Sregsrc}; // MOVE
   6'b101011 : {ncry,alu_out} = {cry,   mul_out[31:0]}; // IMUL
   6'b110000 : {ncry,alu_out} = {cry,   sft_out[31:0]}; // SHIFT
   6'b110100 : {ncry,alu_out} = {cry,   sft_out[31:0]}; // SHIFT
   default   : {ncry,alu_out} = {cry,regdest         }; // DO NOTHING
  endcase
 end
// Main instruction decode
always @(ID,state)
 begin
   // One cycle instructions, operand selection
   if (state == `fetch)
    begin
     case ({ID[15:14],ID[9],ID[7]})
      4'b1000  : begin src=ID[5:3]; dest= 3'b111; end  // store into ram (x89 x00)
      4'b1010  : begin src= 3'b111; dest=ID[5:3]; end  // load from ram  (x8b x00)
      4'b1001  : begin src=ID[5:3]; dest=ID[2:0]; end  // reg2reg xfer   (x89 xC0)
      4'b1011  : begin src=ID[2:0]; dest=ID[5:3]; end  // reg2reg xfer   (x8b xC0) & imul
      4'b0001  : begin src=ID[5:3]; dest=ID[2:0]; end  // alu op
      4'b0011  : begin src=ID[2:0]; dest=ID[5:3]; end  // alu op
      default  : begin src=ID[5:3]; dest=ID[2:0]; end  // shift
     endcase
    end
   else if (state==`ret)
        begin src = 3'b011; dest = 3'b100; end
   else begin src = 3'b000; dest = 3'b000; end
   // instructions that require more than one cycle to execute
   if (state == `fetch)
   begin
    casex(ID)
     16'h90e9: nstate = `jmp;
     16'h0f8f: nstate = `jg;
     16'h0f8e: nstate = `jle;
     16'h0f8d: nstate = `jge;
     16'h0f8c: nstate = `jl;
     16'h0f85: nstate = `jne;
     16'h0f84: nstate = `je;
     16'h90bb: nstate = `imm;
     16'h8d9d: nstate = `lea;
     16'h90e8: nstate = `call;
     16'h90c3: nstate = `ret;
     16'hc1xx: nstate = `shift;
     default : nstate = `fetch;
    endcase
    if (ID       == 16'h9066) nprefx = 1'b1; else nprefx = 1'b0;
    if (ID[15:8] ==  8'h39  ) cmpr   = 1'b1; else cmpr   = 1'b0;
   end
   else
   begin
        nprefx = 1'b0;
        cmpr   = 1'b0;
        if (state==`jmp)   nstate = `jmp2;  else if (state==`jmp2)  nstate = `fetch;
   else if (state==`jne)   nstate = `jne2;  else if (state==`jne2)  nstate = `fetch;
   else if (state==`je )   nstate = `je2 ;  else if (state==`je2 )  nstate = `fetch;
   else if (state==`jge)   nstate = `jge2;  else if (state==`jge2)  nstate = `fetch;
   else if (state==`jg )   nstate = `jg2 ;  else if (state==`jg2 )  nstate = `fetch;
   else if (state==`jle)   nstate = `jle2;  else if (state==`jle2)  nstate = `fetch;
   else if (state==`jl )   nstate = `jl2 ;  else if (state==`jl2 )  nstate = `fetch;
   else if (state==`imm)   nstate = `imm2;  else if (state==`imm2)  nstate = `fetch;
   else if (state==`lea)   nstate = `lea2;  else if (state==`lea2)  nstate = `fetch;
   else if (state==`call)  nstate = `call2; else if (state==`call2) nstate = `fetch;
   else if (state==`ret)   nstate = `ret2;  else if (state==`ret2)  nstate = `fetch;
   else if (state==`shift) nstate = `fetch;
   else                    nstate = `fetch;
   end
 end
assign  IA      = PC                ;
assign  A       = (state == `call2) ?  ESP :
                                       EBX ;
assign  mul_out = regsrc * regdest  ;
assign  sft_in  = regdest           ;
assign  shtr    =       ID[12]      ?  ECX[4:0]     : EBX[4:0] ;
assign  Q       = (state == `call2) ?  incPC        : regsrc   ;
assign  WEN     = (ID[15:8]==8'h90) ?  1'b1         :
                  (state == `call2) ?  1'b0         :
                  (dest  == 3'b111) ?  1'b0         :
                                       1'b1         ;
assign      tst = sft_in >>> (shtr);
assign  sft_out = (src   == 3'b111) ? tst                : //sar
                  (src   == 3'b101) ? (sft_in >>  shtr ) : //shr
                                      (sft_in <<  shtr ) ; //shl
assign  Sregsrc =       ID[8]       ? { {16{regsrc[15]}} , regsrc[15:0] } :
                                      { {24{regsrc[7] }} , regsrc[7:0]  } ;
assign  Zregsrc =       ID[8]       ? {  16'b0           , regsrc[15:0] } :
                                      {  24'b0           , regsrc[7:0]  } ;
assign      BEN = (state == `call2 )  ? 1'b1 :
                   {  prefx           , ID[8]        } ;
assign     neqF = (regsrc == regdest) ? 1'b1 : 1'b0;
assign      nlF = (regsrc  > regdest) ? 1'b1 : 1'b0;
assign      ngF = (regsrc  < regdest) ? 1'b1 : 1'b0;
assign    incPC = PC + 3'b010;
assign   pc_jge = ( eqF|gF) ? pc_jp : incPC;
assign   pc_jle = ( eqF|lF) ? pc_jp : incPC;
assign   pc_jg  = ( gF    ) ? pc_jp : incPC;
assign   pc_jl  = ( lF    ) ? pc_jp : incPC;
assign   pc_eq  = ( eqF   ) ? pc_jp : incPC;
assign   pc_neq = ( eqF   ) ? incPC : pc_jp;
assign   pc_jp  = incPC+{ID,EBX[15:0]};
assign adder_out= nncry   + regsrc + regdest;
assign   sub_out= regdest - regsrc - nncry;
assign    nncry = ID[12] ? cry : 1'b0;
endmodule

Line No.	Rev	Author	Line
1	2	ultro	`module sub86( CLK, RSTN, IA, ID, A, D, Q, WEN,BEN );`
2			`input CLK;`
3			`input RSTN;`
4			`output [31:0] IA;`
5			`input [15:0] ID;`
6			`output [31:0] A;`
7			`input [31:0] D;`
8			`output [31:0] Q;`
9			`output WEN;`
10			`output [1:0] BEN;`
11			`wire nncry,neqF,ngF,nlF;`
12			`reg [31:0] EAX,EBX,ECX,EDX,EBP,ESP,PC,regsrc,regdest,alu_out;`
13			`reg eqF,gF,lF;`
14			`reg [4:0] state,nstate;`
15			`reg [2:0] src,dest;`
16			`reg cry,ncry,prefx,nprefx,cmpr;`
17			`wire [31:0] incPC,Sregsrc,Zregsrc,pc_jg,pc_jge,pc_jl,pc_jle,pc_eq,pc_jp,pc_neq;`
18			`wire [63:0] mul_out;`
19			`wire signed [31:0] sft_in,sft_out,tst;`
20			`wire [4:0] shtr;`
21			`wire [32:0] adder_out;`
22			`wire [32:0] sub_out;`
23			`define fetch 5'b00000
24			`define jmp 5'b00001
25			`define jmp2 5'b00010
26			`define jge 5'b00011
27			`define jge2 5'b00100
28			`define imm 5'b00101
29			`define imm2 5'b00110
30			`define lea 5'b00111
31			`define lea2 5'b01000
32			`define call 5'b01001
33			`define call2 5'b01010
34			`define ret 5'b01011
35			`define ret2 5'b01100
36			`define imul 5'b01101
37			`define shift 5'b01110
38			`define jg 5'b01111
39			`define jg2 5'b10000
40			`define jl 5'b10001
41			`define jl2 5'b10010
42			`define jle 5'b10011
43			`define jle2 5'b10100
44			`define je 5'b10101
45			`define je2 5'b10110
46			`define jne 5'b10111
47			`define jne2 5'b11000
48			`always @(posedge CLK or negedge RSTN)`
49			`if(!RSTN) begin`
50			`EAX <= 32'b0; EBX <= 32'b0;`
51			`ECX <= 32'b0; EDX <= 32'b0;`
52			`EBP <= 32'b0; ESP <= 32'b011111111;`
53			`PC <= 32'b00000;`
54			`eqF <= 1'b0; lF <= 1'b0; gF <= 1'b0;`
55			`state <=5'b00000; prefx <= 1'b0;`
56			`cry <= 1'b0;`
57			`end`
58			`else`
59			`begin`
60			`state <= nstate; prefx <= nprefx; cry <= ncry;`
61			`case (cmpr)`
62			`1'b1 : begin eqF <= neqF ; lF <= nlF; gF <= ngF; end`
63			`default: begin eqF <= eqF ; lF <= lF; gF <= gF; end`
64			`endcase`
65			if ((state==`fetch) \|\| (state==`ret))
66			`begin`
67			`if (dest==3'b000) EAX <= alu_out; else EAX<=EAX;`
68			`if (dest==3'b001) ECX <= alu_out; else ECX<=ECX;`
69			`if (dest==3'b010) EDX <= alu_out; else EDX<=EDX;`
70			`if (dest==3'b011) EBX <= alu_out; else EBX<=EBX;`
71			`if (dest==3'b100) ESP <= alu_out; else ESP<=ESP;`
72			`if (dest==3'b101) EBP <= alu_out; else EBP<=EBP;`
73			`end`
74			`else`
75			`begin`
76			`EBP<=EBP;`
77			`EAX<=EAX;`
78			`ECX<=ECX;`
79			`EDX<=EDX;`
80			`case(state)`
81			`jmp , `jg, `jge , `jl, `jle, `je, `jne, `imm, `call,
82			`lea : EBX<={EBX[31:16],ID[7:0],ID[15:8]};
83			`imm2 : EBX<={ID[7:0],ID[15:8], EBX[15:0]};
84			`lea2 : EBX<={ID[7:0],ID[15:8], EBX[15:0]}+EBP;
85			`default : EBX<=EBX;`
86			`endcase`
87			`case(state)`
88			`call : ESP<=ESP - 4'b0100;
89			`ret2 : ESP<=ESP + 4'b0100;
90			`default: ESP<=ESP;`
91			`endcase`
92			`end`
93			`case(state)`
94			`jge2 : PC<=pc_jge;
95			`jle2 : PC<=pc_jle;
96			`jg2 : PC<=pc_jg ;
97			`jl2 : PC<=pc_jl ;
98			`je2 : PC<=pc_eq ;
99			`jne2 : PC<=pc_neq;
100			`jmp2,`call2 : PC<=pc_jp ;
101			`ret2 : PC<=D ;
102			`default : PC<=incPC ;`
103			`endcase`
104			`end`
105			`// muxing for source selection, used in alu & moves`
106			`always@(src,EAX,ECX,EDX,EBX,ESP,EBP,D)`
107			`case(src)`
108			`3'b000 : regsrc = EAX;`
109			`3'b001 : regsrc = ECX;`
110			`3'b010 : regsrc = EDX;`
111			`3'b011 : regsrc = EBX;`
112			`3'b100 : regsrc = ESP;`
113			`3'b101 : regsrc = EBP;`
114			`3'b111 : regsrc = D;`
115			`default: regsrc = EBX;`
116			`endcase`
117			`// muxing for 2nd operand selection, used in alu only`
118			`always@(dest,EAX,ECX,EDX,EBX,ESP,EBP,D)`
119			`case(dest)`
120			`3'b000 : regdest = EAX;`
121			`3'b001 : regdest = ECX;`
122			`3'b010 : regdest = EDX;`
123			`3'b011 : regdest = EBX;`
124			`3'b100 : regdest = ESP;`
125			`3'b101 : regdest = EBP;`
126			`3'b111 : regdest = D ;`
127			`default: regdest = EBX;`
128			`endcase`
129			`// alu`
130			`always@(regdest,regsrc,ID,cry,mul_out,Zregsrc,Sregsrc,sft_out)`
131			`begin`
132			`case (ID[15:10])`
133			`6'b000000 : {ncry,alu_out} = adder_out ; // ADD , carry generation`
134			`6'b000010 : {ncry,alu_out} = {cry,regdest \| regsrc}; // OR`
135			`6'b000100 : {ncry,alu_out} = adder_out ; // ADD , carry use`
136			`6'b000110 : {ncry,alu_out} = sub_out ; // SUB , carry use`
137			`6'b001000 : {ncry,alu_out} = {cry,regdest & regsrc}; // AND`
138			`6'b001010 : {ncry,alu_out} = sub_out ; // SUB , carry generation`
139			`6'b001100 : {ncry,alu_out} = {cry,regdest ^ regsrc}; // XOR`
140			`6'b100010 : {ncry,alu_out} = {cry, regsrc}; // MOVE`
141			`6'b101101 : {ncry,alu_out} = {cry, Zregsrc}; // MOVE`
142			`6'b101111 : {ncry,alu_out} = {cry, Sregsrc}; // MOVE`
143			`6'b101011 : {ncry,alu_out} = {cry, mul_out[31:0]}; // IMUL`
144			`6'b110000 : {ncry,alu_out} = {cry, sft_out[31:0]}; // SHIFT`
145			`6'b110100 : {ncry,alu_out} = {cry, sft_out[31:0]}; // SHIFT`
146			`default : {ncry,alu_out} = {cry,regdest }; // DO NOTHING`
147			`endcase`
148			`end`
149			`// Main instruction decode`
150			`always @(ID,state)`
151			`begin`
152			`// One cycle instructions, operand selection`
153			if (state == `fetch)
154			`begin`
155			`case ({ID[15:14],ID[9],ID[7]})`
156			`4'b1000 : begin src=ID[5:3]; dest= 3'b111; end // store into ram (x89 x00)`
157			`4'b1010 : begin src= 3'b111; dest=ID[5:3]; end // load from ram (x8b x00)`
158			`4'b1001 : begin src=ID[5:3]; dest=ID[2:0]; end // reg2reg xfer (x89 xC0)`
159			`4'b1011 : begin src=ID[2:0]; dest=ID[5:3]; end // reg2reg xfer (x8b xC0) & imul`
160			`4'b0001 : begin src=ID[5:3]; dest=ID[2:0]; end // alu op`
161			`4'b0011 : begin src=ID[2:0]; dest=ID[5:3]; end // alu op`
162			`default : begin src=ID[5:3]; dest=ID[2:0]; end // shift`
163			`endcase`
164			`end`
165			else if (state==`ret)
166			`begin src = 3'b011; dest = 3'b100; end`
167			`else begin src = 3'b000; dest = 3'b000; end`
168			`// instructions that require more than one cycle to execute`
169			if (state == `fetch)
170			`begin`
171			`casex(ID)`
172			16'h90e9: nstate = `jmp;
173			16'h0f8f: nstate = `jg;
174			16'h0f8e: nstate = `jle;
175			16'h0f8d: nstate = `jge;
176			16'h0f8c: nstate = `jl;
177			16'h0f85: nstate = `jne;
178			16'h0f84: nstate = `je;
179			16'h90bb: nstate = `imm;
180			16'h8d9d: nstate = `lea;
181			16'h90e8: nstate = `call;
182			16'h90c3: nstate = `ret;
183			16'hc1xx: nstate = `shift;
184			default : nstate = `fetch;
185			`endcase`
186			`if (ID == 16'h9066) nprefx = 1'b1; else nprefx = 1'b0;`
187			`if (ID[15:8] == 8'h39 ) cmpr = 1'b1; else cmpr = 1'b0;`
188			`end`
189			`else`
190			`begin`
191			`nprefx = 1'b0;`
192			`cmpr = 1'b0;`
193			if (state==`jmp) nstate = `jmp2; else if (state==`jmp2) nstate = `fetch;
194			else if (state==`jne) nstate = `jne2; else if (state==`jne2) nstate = `fetch;
195			else if (state==`je ) nstate = `je2 ; else if (state==`je2 ) nstate = `fetch;
196			else if (state==`jge) nstate = `jge2; else if (state==`jge2) nstate = `fetch;
197			else if (state==`jg ) nstate = `jg2 ; else if (state==`jg2 ) nstate = `fetch;
198			else if (state==`jle) nstate = `jle2; else if (state==`jle2) nstate = `fetch;
199			else if (state==`jl ) nstate = `jl2 ; else if (state==`jl2 ) nstate = `fetch;
200			else if (state==`imm) nstate = `imm2; else if (state==`imm2) nstate = `fetch;
201			else if (state==`lea) nstate = `lea2; else if (state==`lea2) nstate = `fetch;
202			else if (state==`call) nstate = `call2; else if (state==`call2) nstate = `fetch;
203			else if (state==`ret) nstate = `ret2; else if (state==`ret2) nstate = `fetch;
204			else if (state==`shift) nstate = `fetch;
205			else nstate = `fetch;
206			`end`
207			`end`
208			`assign IA = PC ;`
209			assign A = (state == `call2) ? ESP :
210			`EBX ;`
211			`assign mul_out = regsrc * regdest ;`
212			`assign sft_in = regdest ;`
213			`assign shtr = ID[12] ? ECX[4:0] : EBX[4:0] ;`
214			assign Q = (state == `call2) ? incPC : regsrc ;
215			`assign WEN = (ID[15:8]==8'h90) ? 1'b1 :`
216			(state == `call2) ? 1'b0 :
217			`(dest == 3'b111) ? 1'b0 :`
218			`1'b1 ;`
219			`assign tst = sft_in >>> (shtr);`
220			`assign sft_out = (src == 3'b111) ? tst : //sar`
221			`(src == 3'b101) ? (sft_in >> shtr ) : //shr`
222			`(sft_in << shtr ) ; //shl`
223			`assign Sregsrc = ID[8] ? { {16{regsrc[15]}} , regsrc[15:0] } :`
224			`{ {24{regsrc[7] }} , regsrc[7:0] } ;`
225			`assign Zregsrc = ID[8] ? { 16'b0 , regsrc[15:0] } :`
226			`{ 24'b0 , regsrc[7:0] } ;`
227			assign BEN = (state == `call2 ) ? 1'b1 :
228			`{ prefx , ID[8] } ;`
229			`assign neqF = (regsrc == regdest) ? 1'b1 : 1'b0;`
230			`assign nlF = (regsrc > regdest) ? 1'b1 : 1'b0;`
231			`assign ngF = (regsrc < regdest) ? 1'b1 : 1'b0;`
232			`assign incPC = PC + 3'b010;`
233			`assign pc_jge = ( eqF\|gF) ? pc_jp : incPC;`
234			`assign pc_jle = ( eqF\|lF) ? pc_jp : incPC;`
235			`assign pc_jg = ( gF ) ? pc_jp : incPC;`
236			`assign pc_jl = ( lF ) ? pc_jp : incPC;`
237			`assign pc_eq = ( eqF ) ? pc_jp : incPC;`
238			`assign pc_neq = ( eqF ) ? incPC : pc_jp;`
239			`assign pc_jp = incPC+{ID,EBX[15:0]};`
240			`assign adder_out= nncry + regsrc + regdest;`
241			`assign sub_out= regdest - regsrc - nncry;`
242			`assign nncry = ID[12] ? cry : 1'b0;`
243			`endmodule`

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