1 |
2 |
gorand2 |
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2 |
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module aluplus(instr, val1, val2, valres, wrtval, cjmpinstr,cjmp,const1,retaddr);
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3 |
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4 |
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input [31:0] instr, val1, val2;
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5 |
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output [31:0] valres;
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6 |
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output wire wrtval,cjmpinstr;
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7 |
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output cjmp;
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8 |
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input [31:0] const1;
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9 |
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input [31:0] retaddr;
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10 |
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wire [5:0] code;
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11 |
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wire [31:0] valcmp;
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12 |
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wire CF,NF,VF,ZF;
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13 |
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14 |
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/*
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15 |
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wrtval=1 if valres needs to be stored in register.
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16 |
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cjmpinstr=1 if compare and jump instruction
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17 |
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cjmp=1 if jump taken 0 otherwise (only valid if cjmpinstr=1)
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18 |
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*/
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19 |
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20 |
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//assign const1={{16{instr[31]}},instr[31:21],instr[15:11]};
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21 |
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assign code=instr[5:0];
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22 |
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23 |
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assign valres=(code==0) ? {const1[15:0],val1[15:0]} : 32'bz;
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24 |
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assign valres=(code==1) ? const1 : 32'bz;
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25 |
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assign valres=(code==2) ? val1 & val2 : 32'bz;
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26 |
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assign valres=(code==3) ? val1 & const1 : 32'bz;
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27 |
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assign valres=(code==4) ? val1 | val2 : 32'bz;
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28 |
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assign valres=(code==5) ? val1 | const1 : 32'bz;
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29 |
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assign valres=(code==6) ? val1 ^ val2 : 32'bz;
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30 |
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assign valres=(code==7) ? val1 ^ const1 : 32'bz;
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31 |
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assign valres=(code==8) ? val1 + val2 : 32'bz;
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32 |
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assign valres=(code==9) ? val1 + const1 : 32'bz;
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33 |
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assign valres=(code==10)? val1 - val2 : 32'bz;
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34 |
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assign valres=(code==11)? val1 - const1 : 32'bz;
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35 |
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//12=no-op
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36 |
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assign valres=(code==13)? val1 & {16'b1111111111111111, const1[15:0]} : 32'bz;
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37 |
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assign valres=(code==46) ? retaddr : 32'bz;
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38 |
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assign valres=(code==14)? val1 << val2[5:0] : 32'bz;
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39 |
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assign valres=(code==15)? val1 << const1[5:0] : 32'bz;
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40 |
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assign valres=(code==16)? val1 >> val2[5:0] : 32'bz;
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41 |
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assign valres=(code==17)? val1 >> const1[5:0] : 32'bz;
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42 |
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assign valres=(code==18)? {32{val1[31]},val1} >> val2[5:0] : 32'bz;
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43 |
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assign valres=(code==19)? {32{val1[31]},val1} >> const1[5:0] : 32'bz;
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44 |
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45 |
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assign valres=wrtval ? 32'bz : 32'b0;
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46 |
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47 |
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assign wrtval=((code<=11) || (code>=13 && code<=19) || (code==46));
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48 |
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49 |
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//flags for compare &jump
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50 |
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assign {CF,valcmp}=val1 - val2;
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51 |
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assign NF=valcmp[31];
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52 |
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assign ZF=(val1==val2);
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53 |
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assign VF=(val1[31] & !val2[31] & !valcmp[31]) | (!val1[31] & val2[31] & valcmp[31]);
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54 |
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55 |
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assign cjmpinstr=((code>=32)&&(code<=45));
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56 |
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57 |
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assign cjmp= (code==32) ? (CF) : 1'bz;
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58 |
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assign cjmp= (code==33) ? (!CF) : 1'bz;
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59 |
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assign cjmp= (code==34) ? (ZF) : 1'bz;
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60 |
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assign cjmp= (code==35) ? (!ZF) : 1'bz;
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61 |
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assign cjmp= (code==36) ? (CF ^ ZF) : 1'bz;
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62 |
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assign cjmp= (code==37) ? !(CF ^ ZF) : 1'bz;
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63 |
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assign cjmp= (code==38) ? (NF) : 1'bz;
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64 |
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assign cjmp= (code==39) ? !(NF) : 1'bz;
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65 |
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assign cjmp= (code==40) ? (VF ^ NF) : 1'bz;
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66 |
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assign cjmp= (code==41) ? !(VF ^ NF) : 1'bz;
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67 |
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assign cjmp= (code==42) ? ((VF ^ NF) | ZF) : 1'bz;
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68 |
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assign cjmp= (code==43) ? !((VF ^ NF) | ZF) : 1'bz;
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assign cjmp= (code==44) ? (VF) : 1'bz;
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70 |
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assign cjmp= (code==45) ? (!VF) : 1'bz;
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assign cjmp= cjmpinstr ? 1'bz : 1'b0;
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endmodule
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76 |
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module subagu(input clk, input stall,input [4:0] stginhibit,input [31:0] baseOP,input [31:0] instr0,input [31:0] instr, input [31:0] instrprev,output wire [31:0] addr,output wire aguwrtval,output wire delayedstall, output reg [1:0] readsz, output wire readen,output wire writeen, input [31:0] offset);
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wire [4:0] instr_rA,instrprev_rF;
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wire writeinstrprev;
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wire [5:0] instrprev_code,instr_code,instr0_code;
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80 |
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wire instr0_load,instr0_store,instr_load,instr_store;
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81 |
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reg aguwrtval_reg;
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82 |
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reg delayedstall_reg=0;
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//reg readen_reg;
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//wire [18:0] shortaddr;
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85 |
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86 |
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assign instr_rA=instr[10:6];
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assign instrprev_rF=instrprev[20:16];
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assign instrprev_code=instrprev[5:0];
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assign instr_code=instr[5:0];
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assign instr0_code=instr0[5:0];
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91 |
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92 |
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assign writereginstrprev=((instrprev_code<=11) || (instrprev_code==13) ||
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((instrprev_code >= 56) && (instrprev_code <=58))) && !stginhibit[4] && !stall; //remove !stall ??
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assign delayedstall=writereginstrprev && (instr_load || instr_store) && ( instr_rA==instrprev_rF ) && (!stginhibit[3]); //add constant add stalless support
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95 |
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96 |
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assign instr_load=(instr_code >= 56) && (instr_code <=58);
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assign instr_store=(instr_code >= 60) && (instr_code <=62);
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98 |
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assign instr0_load=(instr0_code >= 56) && (instr0_code <=58);
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99 |
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assign instr0_store=(instr0_code >= 60) && (instr0_code <=62);
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100 |
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101 |
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assign addr=baseOP + offset;
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102 |
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//assign shortaddr=baseOP[18:0] + offset[18:0];
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103 |
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104 |
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assign readen=instr_load && !stall && !stginhibit[3];
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105 |
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assign writeen=instr_store && !stall && !stginhibit[3] && !delayedstall_reg;
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106 |
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assign aguwrtval=!stall && !stginhibit[4] && aguwrtval_reg;
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107 |
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108 |
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always @(posedge clk)
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109 |
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begin
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110 |
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if (!stall && !stginhibit[3]) aguwrtval_reg<=instr_load;
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111 |
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///*if (!stall && !stginhibit[2]) */readen_reg<=instr0_load;
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112 |
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if (!stall && !stginhibit[2])
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113 |
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case (instr0_code)
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114 |
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56: readsz<=2;
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115 |
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57: readsz<=1;
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116 |
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58: readsz<=0;
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117 |
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60: readsz<=2;
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118 |
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61: readsz<=1;
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119 |
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62: readsz<=0;
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120 |
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default: readsz<=0;
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121 |
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endcase
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122 |
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delayedstall_reg<=delayedstall;
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123 |
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end
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124 |
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125 |
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endmodule
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126 |
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127 |
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128 |
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module regfileint0(clk,we,rA,rB,rC,rF,dataA,dataB,dataC,dataF);
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129 |
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input [4:0] rA,rB,rC,rF;
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130 |
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output wire [31:0] dataA,dataB,dataC;
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131 |
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input [31:0] dataF;
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132 |
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input clk,we;
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133 |
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reg [31:0] regs [31:0];
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134 |
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135 |
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regram ram0(clk,we,rA,rF,dataA,dataF);
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136 |
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regram ram1(clk,we,rB,rF,dataB,dataF);
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137 |
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regram ram2(clk,we,rC,rF,dataC,dataF);
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138 |
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139 |
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endmodule
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140 |
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141 |
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module regram(input clk,input we,input [4:0] rA, input [4:0] rF, output reg [31:0] dataA, input [31:0] dataF);
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142 |
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reg [31:0] regs[31:0];
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143 |
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always @(posedge clk)
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144 |
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begin
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145 |
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dataA<=regs[rA];
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146 |
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if (we) regs[rF]<=dataF;
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147 |
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end
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148 |
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endmodule
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149 |
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150 |
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module ioinstr(input clk,input stall, input [4:0] stginhibit,input [31:0] instr,input [31:0] val1,input [31:0] val2, output [31:0] valres, input multiCycleStall,
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151 |
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output wire wrtVal, output wire doStall, output wire keepStalling,
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152 |
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output wire [31:0] ioBusAddr,output reg [1:0] ioBusSize, output wire [31:0] ioBusOut, input [31:0] ioBusIn, input ioBusRdy,
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153 |
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output wire ioBusWr,output wire ioBusRd);
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154 |
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155 |
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wire [5:0] code;
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156 |
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wire [5:0] auxCode;
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157 |
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reg keepStalling_reg=0;
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158 |
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reg [31:0] inputValue;
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159 |
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assign code=instr[5:0];
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160 |
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assign auxCode=instr[26:21];
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161 |
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assign doStall=(code==31) && !multiCycleStall && !stall && !stginhibit[4];
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162 |
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assign wrtVal=multiCycleStall && (code==31) && ((auxCode==0) || (auxCode==1) || (auxCode==2)) && !stall && !stginhibit[4];
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163 |
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assign ioBusAddr=val1;
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164 |
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assign ioBusOut=val2;
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165 |
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166 |
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assign ioBusOut=val2;
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167 |
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assign ioBusAddr=val1;
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168 |
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assign ioBusWr=!stall && !stginhibit[4] && !multiCycleStall && (code==31) && ((auxCode==4) || (auxCode==5) || (auxCode==6));
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169 |
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assign ioBusRd=!stall && !stginhibit[4] && !multiCycleStall && (code==31) && ((auxCode==0) || (auxCode==1) || (auxCode==2));
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170 |
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assign valres=inputValue;
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171 |
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172 |
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assign keepStalling=keepStalling_reg;
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173 |
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174 |
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always @(auxCode)
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175 |
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begin
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176 |
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case(auxCode)
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177 |
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0,4: ioBusSize=0;
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178 |
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1,5: ioBusSize=1;
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179 |
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2,6: ioBusSize=2;
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180 |
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default: ioBusSize=0;
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181 |
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endcase
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182 |
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end
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183 |
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184 |
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always @(posedge clk)
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185 |
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begin
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186 |
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if (!stall && !stginhibit[4] && (code==31) && !multiCycleStall)
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187 |
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begin
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188 |
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keepStalling_reg<=1;
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189 |
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end
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190 |
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if (ioBusRdy)
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191 |
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begin
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192 |
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keepStalling_reg<=0;
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193 |
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end
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194 |
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if (ioBusRdy)
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195 |
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begin
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196 |
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inputValue<=ioBusIn;
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197 |
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end
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198 |
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end
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199 |
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200 |
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endmodule
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201 |
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202 |
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module brpred(input clk,input stall, input [4:0] stginhibit,input [31:0] fetchaddr, output wire hit, output wire [31:0] branchinstr,
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203 |
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output wire [31:0] nextaddr,output wire branchtaken,
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204 |
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input [31:0] insertaddr, input [31:0] insertinstr,input [31:0] inserttargetnext,input inserttaken,input jumpinstr,output wire addrMismatch);
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205 |
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wire wen;
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206 |
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wire [5:0] ramAddrB;
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207 |
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wire [96:0] ramDataA;
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208 |
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wire [96:0] ramDataB;
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209 |
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wire [96:0] dataA;
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210 |
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reg [31:0] fetchaddr_reg=0;
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211 |
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reg branchtaken3;
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212 |
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reg branchtaken4;
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213 |
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reg branchtaken5;
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214 |
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reg wen_reg=0;
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215 |
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reg fwd;
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216 |
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reg [96:0] fwdData;
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217 |
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reg init=1;
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218 |
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reg [5:0] initcount=63;
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219 |
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220 |
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reg [31:0] nextaddr3;
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221 |
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reg [31:0] nextaddr4;
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222 |
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reg [31:0] nextaddr5;
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223 |
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224 |
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brpred_ram ram0(clk,fetchaddr[7:2],ramAddrB,wen, ramDataA, ramDataB);
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225 |
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226 |
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assign dataA=fwd ? fwdData : ramDataA;
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227 |
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228 |
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assign hit=(dataA[63:32]==fetchaddr_reg);
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229 |
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assign branchinstr=dataA[31:0];
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230 |
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assign branchtaken=dataA[96];
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231 |
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assign nextaddr=dataA[95:64];
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232 |
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233 |
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assign wen=((!stall && !stginhibit[4]) && (branchtaken5 ^ inserttaken) && jumpinstr) | init; //only write on failed prediction
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234 |
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assign ramDataB=(!init) ? {inserttaken,inserttargetnext,insertaddr,insertinstr} : {1'b0,32'b0,32'b11,32'b0};
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235 |
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assign ramAddrB= init ? initcount : insertaddr[7:2];
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236 |
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237 |
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assign addrMismatch=jumpinstr && (inserttargetnext != nextaddr5) && branchtaken5;
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238 |
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239 |
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always @(posedge clk)
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240 |
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begin
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241 |
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wen_reg<=wen;
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242 |
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fwd<=wen && (ramAddrB == fetchaddr[7:2]);
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243 |
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fwdData<=ramDataB;
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244 |
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245 |
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if (init)
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246 |
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begin
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247 |
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initcount<=initcount-1;
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248 |
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if (initcount==0) init<=0;
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249 |
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end
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250 |
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251 |
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if (!stall)
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252 |
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begin
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253 |
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fetchaddr_reg<=fetchaddr;
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254 |
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end
|
255 |
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if (!stall && !stginhibit[1])
|
256 |
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begin
|
257 |
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branchtaken3<=hit && branchtaken;
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258 |
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nextaddr3<=nextaddr;
|
259 |
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end
|
260 |
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if (!stall && !stginhibit[2])
|
261 |
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begin
|
262 |
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branchtaken4<=branchtaken3;
|
263 |
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nextaddr4<=nextaddr3;
|
264 |
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end
|
265 |
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if (!stall && !stginhibit[3])
|
266 |
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begin
|
267 |
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branchtaken5<=branchtaken4;
|
268 |
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nextaddr5<=nextaddr4;
|
269 |
|
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end
|
270 |
|
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if (!stall && !stginhibit[4])
|
271 |
|
|
begin
|
272 |
|
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end
|
273 |
|
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end
|
274 |
|
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endmodule
|
275 |
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|
276 |
|
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module brpred_ram(input clk, input [5:0] addrA, input [5:0] addrB, input wen, output reg [96:0] dataA, input [96:0] dataB);
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277 |
|
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reg [96:0] ram[63:0];
|
278 |
|
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always @(posedge clk)
|
279 |
|
|
begin
|
280 |
|
|
dataA<=ram[addrA];
|
281 |
|
|
if (wen) ram[addrB]<=dataB;
|
282 |
|
|
end
|
283 |
|
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endmodule
|
284 |
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|
285 |
|
|
module cpu(input clk,input busEnRead,input busEnWrite, input busDataReady, output wire busRead, output wire busWrite,output wire [31:0] busAddr,
|
286 |
|
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input [511:0] busInput,output wire [511:0] busOutput,
|
287 |
|
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output wire [31:0] ioBusAddr,output wire [1:0] ioBusSize, output wire [31:0] ioBusOut, input [31:0] ioBusIn, input ioBusRdy,
|
288 |
|
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output wire ioBusWr,output wire ioBusRd,output wire [3:0] dummy);
|
289 |
|
|
wire [31:0] fetchaddr,fetchdata,readaddr,readdata;
|
290 |
|
|
reg [31:0] readaddr_reg;
|
291 |
|
|
reg [4:0] stginhibit=5'b11110;
|
292 |
|
|
reg [4:0] stginhibit_wrt;
|
293 |
|
|
reg [31:0] IP=32'b0,IP2,IP3,IP4,IP5,instr=0,instr4=0;
|
294 |
|
|
reg stall0=0;
|
295 |
|
|
wor stall;
|
296 |
|
|
wire [4:0] rA0,rB0,rC,rF0,rFprev,rFprevprev;
|
297 |
|
|
//reg [31:0] cjmpoff;
|
298 |
|
|
reg [4:0] rA,rB,rF,rAprev,rBprev;
|
299 |
|
|
wire intregwe;
|
300 |
|
|
wire [31:0] intregdataF;
|
301 |
|
|
wire [31:0] intregdataA,intregdataB,intregdataC;
|
302 |
|
|
wire [31:0] opA,opB,opC,opF;
|
303 |
|
|
reg rAfwd,rBfwd,rCfwd,rAfwd0,rBfwd0,rCfwd0;
|
304 |
|
|
reg cycle1prev=0;
|
305 |
|
|
reg [31:0] instr0=0;
|
306 |
|
|
//reg [31:0] reg_instr0;
|
307 |
|
|
wire aluwrtval,alucjmpinstr,alucjmp;
|
308 |
|
|
//reg regfwrt=0;
|
309 |
|
|
reg [31:0] regfwd;
|
310 |
|
|
wire [31:0] aguaddr;
|
311 |
|
|
wire agustall,aguwrtval;
|
312 |
|
|
wire [1:0] agureadsz;
|
313 |
|
|
wire agureaden;
|
314 |
|
|
wire aguwriteen;
|
315 |
|
|
reg agureaden_reg;
|
316 |
|
|
reg aguwriteen_reg;
|
317 |
|
|
reg agustall_reg=0;
|
318 |
|
|
//aguwrtval ignores exceptions for now
|
319 |
|
|
reg [31:0] cjmpoffset;
|
320 |
|
|
reg [31:0] cjmpoffset0;
|
321 |
|
|
reg [31:0] cjmpaddr;
|
322 |
|
|
wire brpred_hit;
|
323 |
|
|
wire [31:0] brpred_instr;
|
324 |
|
|
wire [31:0] brpred_nextaddr;
|
325 |
|
|
wire brpred_taken;
|
326 |
|
|
wire [31:0] brpred_instertaddr;
|
327 |
|
|
wire [31:0] brpred_instertinstr;
|
328 |
|
|
wire [31:0] brpred_insertnextaddr;
|
329 |
|
|
wire brpred_inserttaken;
|
330 |
|
|
wire brpred_jumpinstr;
|
331 |
|
|
wire brpred_addrMismatch;
|
332 |
|
|
|
333 |
|
|
reg brtaken3,brtaken4,brtaken5;
|
334 |
|
|
|
335 |
|
|
reg init=1;
|
336 |
|
|
reg ccInit=1;
|
337 |
|
|
reg dcInit=1;
|
338 |
|
|
reg [6:0] initcount=66;
|
339 |
|
|
reg [5:0] ccInitCount=63;
|
340 |
|
|
reg [5:0] dcInitCount=63;
|
341 |
|
|
reg [4:0] codeMiss=0;
|
342 |
|
|
wire [31:0] ccFetchAddr;
|
343 |
|
|
//wire [511:0] cacheLineInput;
|
344 |
|
|
wire ccHit,ccReadEn,ccInsert;
|
345 |
|
|
reg ccInsertInProgress_tsk=0;
|
346 |
|
|
reg ccInsertRamReq_tsk=0;
|
347 |
|
|
reg ccInsertInsert_tsk=0;
|
348 |
|
|
reg ccInsertWait1_tsk=0;
|
349 |
|
|
reg ccInsertWait2_tsk=0;
|
350 |
|
|
|
351 |
|
|
wire [31:0] dcAddr;
|
352 |
|
|
wire [511:0] dcDataA;
|
353 |
|
|
wire [511:0] dcDataWriteBack;
|
354 |
|
|
reg [511:0] dcDataWriteBack_reg;
|
355 |
|
|
wire dcHit;
|
356 |
|
|
wire dcReadEn,dcWriteEn,dcInsert,dcInitEntry;
|
357 |
|
|
reg dcInsertInProgress_tsk=0;
|
358 |
|
|
reg dcInsertRamReq_tsk=0;
|
359 |
|
|
reg dcInsertInsert_tsk=0;
|
360 |
|
|
reg dcInsertCheckDirty_tsk=0;
|
361 |
|
|
reg dcInsertWriteBack_tsk=0;
|
362 |
|
|
reg [31:0] dcReadAddr;
|
363 |
|
|
reg [31:0] dcOldAddr_reg;
|
364 |
|
|
wire [31:0] dcOldAddr;
|
365 |
|
|
|
366 |
|
|
reg [31:0] constBits; // contains the constant bits
|
367 |
|
|
reg [31:0] constBits4;
|
368 |
|
|
reg prevUpperBits=0; //bit 0 set => constBits countains the upper constant bits of the next instruction
|
369 |
|
|
|
370 |
|
|
wire [31:0] retAddr;
|
371 |
|
|
wire uJmpInstr;
|
372 |
|
|
reg [31:0] aguaddr_reg;
|
373 |
|
|
|
374 |
|
|
reg [4:0] multiCycleStall=0;
|
375 |
|
|
|
376 |
|
|
wire [31:0] ioInstrResult;
|
377 |
|
|
wire wasGlobalStall=multiCycleStall[4];
|
378 |
|
|
wire ioInstrWrtVal;
|
379 |
|
|
wire ioInstrDoStall;
|
380 |
|
|
wire ioInstrKeepStalling;
|
381 |
|
|
|
382 |
|
|
|
383 |
|
|
//dataunit data0(clk,stall,stginhibit,readaddr,readdata,agureadsz,agureaden,aguwriteen,opB);
|
384 |
|
|
datacache datacache0(clk,stall,stginhibit,codeMiss,dcAddr,dcDataA,busInput,opB,dcHit,dcReadEn,dcWriteEn,dcInsert,dcInitEntry,agureadsz,dcOldAddr);
|
385 |
|
|
regfileint0 regf0(clk,intregwe,rA,rB,rC,rF,intregdataA,intregdataB,intregdataC,intregdataF);
|
386 |
|
|
aluplus alu0(instr4,opA,opB,opF,aluwrtval,alucjmpinstr,alucjmp,constBits4,retAddr);
|
387 |
|
|
ioinstr ioinstr0(clk,stall,stginhibit,instr4,opA,opB,ioInstrResult,wasGlobalStall,ioInstrWrtVal,ioInstrDoStall,ioInstrKeepStalling,
|
388 |
|
|
ioBusAddr,ioBusSize,ioBusOut,ioBusIn,ioBusRdy,ioBusWr,ioBusRd);
|
389 |
|
|
subagu agu0(clk,stall,stginhibit,opC,instr0,instr,instr4,aguaddr,aguwrtval,agustall,agureadsz,agureaden,aguwriteen,constBits);
|
390 |
|
|
brpred brpred0(clk,stall,stginhibit,fetchaddr,brpred_hit,brpred_instr,brpred_nextaddr,brpred_taken,
|
391 |
|
|
brpred_instertaddr,brpred_instertinstr,brpred_insertnextaddr,brpred_inserttaken,brpred_jumpinstr,brpred_addrMismatch);
|
392 |
|
|
codecache codecache0(clk,ccFetchAddr,fetchdata,busInput,ccHit,ccReadEn,ccInsert,ccInit);
|
393 |
|
|
|
394 |
|
|
assign dummy=stginhibit[4:1];
|
395 |
|
|
assign fetchaddr=!(!stall && !stginhibit[1] && brpred_hit&&brpred_taken) ? IP : brpred_nextaddr;
|
396 |
|
|
assign stall=init || ccInsertInProgress_tsk || dcInsertInProgress_tsk || ioInstrKeepStalling;
|
397 |
|
|
|
398 |
|
|
assign readdata=dcDataA[31:0];
|
399 |
|
|
assign dcReadEn=agureaden && !agustall;
|
400 |
|
|
assign dcWriteEn=aguwriteen && !agustall;
|
401 |
|
|
assign dcInsert=dcInsertInsert_tsk && busDataReady;
|
402 |
|
|
assign dcInitEntry=dcInit;
|
403 |
|
|
|
404 |
|
|
assign dcAddr=dcInit ? { 20'b0,dcInitCount,6'b0} : 32'bz;
|
405 |
|
|
assign dcAddr=(dcReadEn || dcWriteEn) ? readaddr : 32'bz;
|
406 |
|
|
assign dcAddr=dcInsert ? dcReadAddr : 32'bz;
|
407 |
|
|
assign dcAddr=(!dcInit && !dcReadEn && !dcWriteEn && !dcInsert) ? 32'b0 : 32'bz;
|
408 |
|
|
|
409 |
|
|
assign ccFetchAddr=ccInit ? { 20'b0,ccInitCount,6'b0} : 32'bz;
|
410 |
|
|
assign ccFetchAddr=(!ccInit && !ccInsertInsert_tsk)? fetchaddr : 32'bz; //that should change to accomodate cache line insert
|
411 |
|
|
assign ccFetchAddr=ccInsertInsert_tsk ? IP & 32'hffff_ffc0 : 32'bz;
|
412 |
|
|
|
413 |
|
|
assign ccReadEn=!stall && !codeMiss[1] && !ccInit && !init;
|
414 |
|
|
assign ccInsert=ccInsertInsert_tsk && busDataReady;
|
415 |
|
|
|
416 |
|
|
assign busAddr=ccInsertRamReq_tsk ? IP & 32'hffff_ffc0 :32'bz;
|
417 |
|
|
assign busAddr=dcInsertRamReq_tsk ? dcReadAddr & 32'hffff_ffc0: 32'bz;
|
418 |
|
|
assign busAddr=dcInsertWriteBack_tsk ? dcOldAddr_reg : 32'bz;
|
419 |
|
|
assign busAddr=(!ccInsertRamReq_tsk && !dcInsertRamReq_tsk && !dcInsertWriteBack_tsk) ? 32'b0 : 32'bz;
|
420 |
|
|
|
421 |
|
|
assign busRead=(ccInsertRamReq_tsk || dcInsertRamReq_tsk) && busEnRead;
|
422 |
|
|
assign busWrite=dcInsertWriteBack_tsk && busEnWrite;
|
423 |
|
|
|
424 |
|
|
assign dcDataWriteBack=dcDataA;
|
425 |
|
|
assign busOutput=dcDataWriteBack_reg;
|
426 |
|
|
|
427 |
|
|
assign rA0=instr0[10:6];
|
428 |
|
|
assign rB0=instr0[15:11];
|
429 |
|
|
assign rF0=instr0[20:16];
|
430 |
|
|
assign rC=instr0[10:6];
|
431 |
|
|
|
432 |
|
|
assign intregwe=!stall && !stginhibit[4] && (aluwrtval || aguwrtval) && (!agustall_reg) && !((agureaden_reg || aguwriteen_reg) && !dcHit); // adjust for other cases ie mem read-done;
|
433 |
|
|
assign intregdataF= aguwrtval ? readdata : opF; //adjust for ie mem read-done
|
434 |
|
|
assign opA=rAfwd ? regfwd : intregdataA;
|
435 |
|
|
assign opB=rBfwd ? regfwd : intregdataB;
|
436 |
|
|
assign opC=rCfwd ? regfwd : intregdataC;
|
437 |
|
|
|
438 |
|
|
//assign instr0=fetchdata; //change for branch prediction
|
439 |
|
|
|
440 |
|
|
assign rFprev=instr[20:16];
|
441 |
|
|
assign rFprevprev=instr4[20:16];
|
442 |
|
|
//assign rAfwd=(rA==rFprev);
|
443 |
|
|
//assign rBfwd=(rB==rFprev);
|
444 |
|
|
//assign intregdataF=opF;
|
445 |
|
|
|
446 |
|
|
assign readaddr=aguaddr;
|
447 |
|
|
|
448 |
|
|
assign brpred_jumpinstr=alucjmpinstr || uJmpInstr;
|
449 |
|
|
assign brpred_inserttaken=alucjmp || uJmpInstr;
|
450 |
|
|
assign brpred_instertinstr=instr4;
|
451 |
|
|
assign brpred_instertaddr=IP5;
|
452 |
|
|
assign brpred_insertnextaddr=alucjmpinstr ? cjmpaddr : aguaddr_reg ;
|
453 |
|
|
|
454 |
|
|
assign retAddr=IP5+4;
|
455 |
|
|
assign uJmpInstr=(instr4[5:0]==46 || instr4[5:0]==47);
|
456 |
|
|
|
457 |
|
|
//regfwrt<=0;
|
458 |
|
|
always @(posedge clk)
|
459 |
|
|
begin
|
460 |
|
|
if (init)
|
461 |
|
|
begin
|
462 |
|
|
initcount<=initcount-1;
|
463 |
|
|
if (initcount==0) init<=0;
|
464 |
|
|
end
|
465 |
|
|
if (ccInit)
|
466 |
|
|
begin
|
467 |
|
|
ccInitCount<=ccInitCount-1;
|
468 |
|
|
if (ccInitCount==0) ccInit<=0;
|
469 |
|
|
end
|
470 |
|
|
if (dcInit)
|
471 |
|
|
begin
|
472 |
|
|
dcInitCount<=dcInitCount-1;
|
473 |
|
|
if (dcInitCount==0) dcInit<=0;
|
474 |
|
|
end
|
475 |
|
|
if (ccInsertRamReq_tsk && busEnRead)
|
476 |
|
|
begin
|
477 |
|
|
ccInsertRamReq_tsk<=0;
|
478 |
|
|
ccInsertInsert_tsk<=1;
|
479 |
|
|
end
|
480 |
|
|
if (ccInsertInsert_tsk && busDataReady)
|
481 |
|
|
begin
|
482 |
|
|
ccInsertInsert_tsk<=0;
|
483 |
|
|
ccInsertWait1_tsk<=1;
|
484 |
|
|
end
|
485 |
|
|
if (ccInsertWait1_tsk)
|
486 |
|
|
begin
|
487 |
|
|
ccInsertWait1_tsk<=0;
|
488 |
|
|
ccInsertWait2_tsk<=1;
|
489 |
|
|
end
|
490 |
|
|
if (ccInsertWait2_tsk)
|
491 |
|
|
begin
|
492 |
|
|
ccInsertWait2_tsk<=0;
|
493 |
|
|
ccInsertInProgress_tsk<=0;
|
494 |
|
|
end
|
495 |
|
|
if (dcInsertRamReq_tsk && busEnRead)
|
496 |
|
|
begin
|
497 |
|
|
dcInsertRamReq_tsk<=0;
|
498 |
|
|
dcInsertInsert_tsk<=1;
|
499 |
|
|
end
|
500 |
|
|
if (dcInsertInsert_tsk && busDataReady)
|
501 |
|
|
begin
|
502 |
|
|
dcInsertInsert_tsk<=0;
|
503 |
|
|
dcInsertCheckDirty_tsk<=1;
|
504 |
|
|
end
|
505 |
|
|
if (dcInsertCheckDirty_tsk)
|
506 |
|
|
begin
|
507 |
|
|
dcInsertCheckDirty_tsk<=0;
|
508 |
|
|
if (dcHit)
|
509 |
|
|
begin
|
510 |
|
|
dcInsertWriteBack_tsk<=1;
|
511 |
|
|
dcOldAddr_reg<=dcOldAddr;
|
512 |
|
|
dcDataWriteBack_reg<=dcDataWriteBack;
|
513 |
|
|
end
|
514 |
|
|
else
|
515 |
|
|
begin
|
516 |
|
|
dcInsertInProgress_tsk<=0;
|
517 |
|
|
end
|
518 |
|
|
end
|
519 |
|
|
if (dcInsertWriteBack_tsk && busEnWrite)
|
520 |
|
|
begin
|
521 |
|
|
dcInsertWriteBack_tsk<=0;
|
522 |
|
|
dcInsertInProgress_tsk<=0;
|
523 |
|
|
end
|
524 |
|
|
//stginhibit_wrt=stginhibit;
|
525 |
|
|
if (stginhibit[1]) stginhibit_wrt[2]=1;
|
526 |
|
|
if (stginhibit[2]) stginhibit_wrt[3]=1;
|
527 |
|
|
if (stginhibit[3]) stginhibit_wrt[4]=1;
|
528 |
|
|
agustall_reg<=agustall;
|
529 |
|
|
agureaden_reg<=agureaden;
|
530 |
|
|
aguwriteen_reg<=aguwriteen;
|
531 |
|
|
readaddr_reg<=readaddr;
|
532 |
|
|
//cycle 1
|
533 |
|
|
if (!stall)
|
534 |
|
|
begin
|
535 |
|
|
stginhibit[1]<=0;
|
536 |
|
|
cycle1prev<=1;
|
537 |
|
|
IP<=fetchaddr+4;
|
538 |
|
|
IP2<=fetchaddr;
|
539 |
|
|
multiCycleStall[1]<=multiCycleStall[0];
|
540 |
|
|
multiCycleStall[0]<=0;
|
541 |
|
|
end
|
542 |
|
|
else cycle1prev<=0;
|
543 |
|
|
|
544 |
|
|
//cycle 2
|
545 |
|
|
if (!stall && !stginhibit[1])
|
546 |
|
|
begin
|
547 |
|
|
stginhibit[2]<=0;
|
548 |
|
|
IP3<=IP2;
|
549 |
|
|
multiCycleStall[2]<=multiCycleStall[1];
|
550 |
|
|
if (!(brpred_hit&&brpred_taken)) instr0<=ccHit ? fetchdata : 32'b01100;
|
551 |
|
|
else instr0<=brpred_instr;
|
552 |
|
|
brtaken3<=(brpred_hit&&brpred_taken);
|
553 |
|
|
if (!ccHit)
|
554 |
|
|
begin
|
555 |
|
|
codeMiss[1]<=1;
|
556 |
|
|
codeMiss[2]<=1;
|
557 |
|
|
end
|
558 |
|
|
if (codeMiss[1]) codeMiss[2]<=1;
|
559 |
|
|
|
560 |
|
|
end
|
561 |
|
|
//cycle 3
|
562 |
|
|
if (!stall && !stginhibit[2])
|
563 |
|
|
begin
|
564 |
|
|
instr<=instr0;
|
565 |
|
|
//reg_instr0<=fetchdata;
|
566 |
|
|
stginhibit[3]<=0;
|
567 |
|
|
multiCycleStall[3]<=multiCycleStall[2];
|
568 |
|
|
IP4<=IP3;
|
569 |
|
|
rA<=instr0[10:6];
|
570 |
|
|
rB<=instr0[15:11];
|
571 |
|
|
brtaken4<=brtaken3;
|
572 |
|
|
codeMiss[3]<=codeMiss[2];
|
573 |
|
|
cjmpoffset0<={ {14{instr0[31]}}, instr0[31:16],2'b0 };
|
574 |
|
|
if (instr0[5:0]==30) //upper bits instr
|
575 |
|
|
begin
|
576 |
|
|
prevUpperBits<=1;
|
577 |
|
|
constBits[31:16]<=instr0[31:16];
|
578 |
|
|
end
|
579 |
|
|
else
|
580 |
|
|
begin
|
581 |
|
|
prevUpperBits<=0;
|
582 |
|
|
end
|
583 |
|
|
if (instr0[5:0]==60 || instr0[5:0]==61 || instr0[5:0]==62) //store instr
|
584 |
|
|
begin
|
585 |
|
|
constBits[15:0]<=instr0[31:16];
|
586 |
|
|
end
|
587 |
|
|
else //non-store instr
|
588 |
|
|
begin
|
589 |
|
|
constBits[15:0]<={instr0[31:21],instr0[15:11]};
|
590 |
|
|
end
|
591 |
|
|
if (!prevUpperBits) constBits[31:16]<={16{instr0[31]}};
|
592 |
|
|
end
|
593 |
|
|
//cycle 4
|
594 |
|
|
if (!stall && !stginhibit[3])
|
595 |
|
|
begin
|
596 |
|
|
constBits4<=constBits;
|
597 |
|
|
stginhibit[4]<=0;
|
598 |
|
|
IP5<=IP4;
|
599 |
|
|
multiCycleStall[4]<=multiCycleStall[3];
|
600 |
|
|
rAfwd0<=(rA0==rFprev);
|
601 |
|
|
rBfwd0<=(rB0==rFprev);
|
602 |
|
|
instr4<=instr;
|
603 |
|
|
rF<=instr[20:16];
|
604 |
|
|
cjmpoffset<={ {14{instr[31]}}, instr[31:16],2'b0 };
|
605 |
|
|
cjmpaddr<=IP4+cjmpoffset0;
|
606 |
|
|
brtaken5<=brtaken4;
|
607 |
|
|
codeMiss[4]<=codeMiss[3];
|
608 |
|
|
aguaddr_reg<=aguaddr;
|
609 |
|
|
end
|
610 |
|
|
//cycle 5
|
611 |
|
|
|
612 |
|
|
if (!stall && !stginhibit[4]) //remove !stall ??
|
613 |
|
|
begin
|
614 |
|
|
rAfwd<=rAfwd0 && (aluwrtval || aguwrtval) && (!agustall_reg); //adjust for other sources of data
|
615 |
|
|
rBfwd<=rBfwd0 && (aluwrtval || aguwrtval) && (!agustall_reg); //these 2 indicate forwarding of operands from regfwd
|
616 |
|
|
rCfwd<=(rA0==rFprevprev) && (aluwrtval || aguwrtval) && (!agustall_reg);
|
617 |
|
|
|
618 |
|
|
regfwd<=aguwrtval ? readdata : opF;
|
619 |
|
|
if (codeMiss[4])
|
620 |
|
|
begin
|
621 |
|
|
stginhibit<=5'b11110;
|
622 |
|
|
codeMiss<=0;
|
623 |
|
|
IP<=IP5;
|
624 |
|
|
ccInsertInProgress_tsk<=1;
|
625 |
|
|
ccInsertRamReq_tsk<=1;
|
626 |
|
|
end
|
627 |
|
|
else if ((agureaden_reg || aguwriteen_reg) && !dcHit && !agustall_reg)
|
628 |
|
|
begin
|
629 |
|
|
stginhibit<=5'b11110;
|
630 |
|
|
codeMiss<=0;
|
631 |
|
|
IP<=IP5;
|
632 |
|
|
dcInsertInProgress_tsk<=1;
|
633 |
|
|
dcInsertRamReq_tsk<=1;
|
634 |
|
|
dcReadAddr<=readaddr_reg;
|
635 |
|
|
end
|
636 |
|
|
else if ((((alucjmpinstr && alucjmp) || uJmpInstr) ^ brtaken5) || brpred_addrMismatch)
|
637 |
|
|
begin
|
638 |
|
|
stginhibit<=5'b11110;
|
639 |
|
|
codeMiss<=0;
|
640 |
|
|
IP<=(alucjmp || uJmpInstr) ? (alucjmpinstr ? (IP5+cjmpoffset) : (opA+constBits4) ): IP5+4;
|
641 |
|
|
end
|
642 |
|
|
else if (agustall_reg)
|
643 |
|
|
begin
|
644 |
|
|
stginhibit<=5'b11110;
|
645 |
|
|
codeMiss<=0;
|
646 |
|
|
IP<=IP5;
|
647 |
|
|
end
|
648 |
|
|
else if (ioInstrDoStall)
|
649 |
|
|
begin
|
650 |
|
|
stginhibit<=5'b11110;
|
651 |
|
|
codeMiss<=0;
|
652 |
|
|
IP<=IP5;
|
653 |
|
|
multiCycleStall[0]<=1;
|
654 |
|
|
end
|
655 |
|
|
end
|
656 |
|
|
else
|
657 |
|
|
begin
|
658 |
|
|
rAfwd<=0;
|
659 |
|
|
rBfwd<=0;
|
660 |
|
|
rCfwd<=0;
|
661 |
|
|
end
|
662 |
|
|
//
|
663 |
|
|
end
|
664 |
|
|
endmodule
|