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annotate core/src/SFIFO.bsv @ 15:a1833d9f6e3d pygar svn.16

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[svn r16] Recent
author punk
date Tue, 27 Apr 2010 13:11:45 -0400
parents 91a1f76ddd62
children
rev   line source
punk@1 1
punk@1 2 import FIFO::*;
punk@1 3 import ConfigReg::*;
punk@1 4 import RWire::*;
punk@1 5
punk@1 6 import List::*;
punk@1 7 import Monad::*;
punk@1 8
punk@1 9 interface SFIFO#(type alpha_T, type search_T);
punk@1 10 method Action enq(alpha_T x);
punk@1 11 method Action deq();
punk@1 12 method alpha_T first();
punk@1 13 method Action clear();
punk@1 14 method Bool find(search_T x);
punk@1 15 method Bool find2(search_T x);
punk@1 16
punk@1 17 endinterface
punk@1 18
punk@1 19 module mkSFIFO#(function Bool searchfunc(search_T s, alpha_T x)) (SFIFO#(alpha_T, search_T))
punk@1 20 provisos
punk@1 21 (Bits#(alpha_T,asz));
punk@1 22
punk@1 23 Reg#(alpha_T) f0 <- mkConfigRegU();
punk@1 24 Reg#(alpha_T) f1 <- mkConfigRegU();
punk@1 25
punk@1 26 Reg#(Bool) vf0 <- mkConfigReg(False);
punk@1 27 Reg#(Bool) vf1 <- mkConfigReg(False);
punk@1 28
punk@1 29 PulseWire edge1 <- mkPulseWire();
punk@1 30
punk@1 31 method Action enq(alpha_T x) if (!(vf0 && vf1));
punk@1 32 if (edge1 || !vf0)//empty or we're dequeueing
punk@1 33 begin
punk@1 34 vf0 <= True; //True
punk@1 35 vf1 <= False;
punk@1 36 f0 <= x;
punk@1 37 end
punk@1 38 else // !vf1
punk@1 39 begin
punk@1 40 vf1 <= True;
punk@1 41 f1 <= x;
punk@1 42 end
punk@1 43 endmethod
punk@1 44
punk@1 45 method Action deq() if (vf0);
punk@1 46 edge1.send();
punk@1 47 vf0 <= vf1;
punk@1 48 f0 <= f1;
punk@1 49 vf1 <= False;
punk@1 50 endmethod
punk@1 51
punk@1 52 method alpha_T first() if(vf0);
punk@1 53 return (f0);
punk@1 54 endmethod
punk@1 55
punk@1 56 method Action clear();
punk@1 57 vf0 <= False;
punk@1 58 vf1 <= False;
punk@1 59 endmethod
punk@1 60
punk@1 61 method Bool find(search_T sv);
punk@1 62 Bool nvf0 = edge1 ? False: vf0;
punk@1 63 Bool nvf1 = vf1;
punk@1 64
punk@1 65 return (nvf0 && searchfunc(sv, f0) ||
punk@1 66 nvf1 && searchfunc(sv, f1));
punk@1 67 endmethod
punk@1 68
punk@1 69 method Bool find2(search_T sv);
punk@1 70 Bool nvf0 = edge1 ? False: vf0;
punk@1 71 Bool nvf1 = vf1;
punk@1 72
punk@1 73 return (nvf0 && searchfunc(sv, f0) ||
punk@1 74 nvf1 && searchfunc(sv, f1));
punk@1 75 endmethod
punk@1 76
punk@1 77 endmodule
punk@1 78
punk@1 79 module mkSFIFO1#(function Bool searchfunc(search_T s, alpha_T x)) (SFIFO#(alpha_T, search_T))
punk@1 80 provisos
punk@1 81 (Bits#(alpha_T,asz), Eq#(alpha_T));
punk@1 82
punk@1 83 Reg#(alpha_T) f0 <- mkConfigRegU;
punk@1 84
punk@1 85 Reg#(Bool) vf0 <- mkConfigReg(False);
punk@1 86
punk@1 87 PulseWire edge1 <- mkPulseWire();
punk@1 88
punk@1 89 method Action enq(alpha_T x) if (!vf0);
punk@1 90 vf0 <= True; //True
punk@1 91 f0 <= x;
punk@1 92 endmethod
punk@1 93
punk@1 94 method Action deq() if (vf0);
punk@1 95 edge1.send();
punk@1 96 vf0 <= False;
punk@1 97 endmethod
punk@1 98
punk@1 99 method alpha_T first() if(vf0);
punk@1 100 return (f0);
punk@1 101 endmethod
punk@1 102
punk@1 103 method Action clear();
punk@1 104 vf0 <= False;
punk@1 105 endmethod
punk@1 106
punk@1 107 method Bool find(search_T sv);
punk@1 108 Bool nvf0 = edge1 ? False: vf0;
punk@1 109
punk@1 110 return (nvf0 && searchfunc(sv, f0));
punk@1 111 endmethod
punk@1 112
punk@1 113 method Bool find2(search_T sv);
punk@1 114 Bool nvf0 = edge1 ? False: vf0;
punk@1 115 return (nvf0 && searchfunc(sv, f0));
punk@1 116 endmethod
punk@1 117
punk@1 118 endmodule
punk@1 119
punk@1 120 module mkSizedSFIFOInternal#(Integer n,
punk@1 121 function Bool searchfunc1(search_T s, alpha_T x),
punk@1 122 function Bool searchfunc2(search_T s, alpha_T x)) (SFIFO#(alpha_T, search_T))
punk@1 123
punk@1 124 provisos ( Bits#(alpha_T,alpha_SZ) );
punk@1 125
punk@1 126 List#(Reg#(alpha_T)) registers <- replicateM(n, mkRegU);
punk@1 127 List#(Reg#(Bool)) valids <- replicateM(n, mkReg(False));
punk@1 128
punk@1 129 function Nat getNextFree (List#(Reg#(Bool)) vs);
punk@1 130
punk@1 131 Nat res = fromInteger(n - 1);
punk@1 132
punk@1 133 for (Integer x = n - 1; x > -1; x = x - 1)
punk@1 134 res = !vs[x]._read() ? fromInteger(x) : res;
punk@1 135
punk@1 136 return res;
punk@1 137
punk@1 138 endfunction
punk@1 139
punk@1 140 function Bool notFull();
punk@1 141
punk@1 142 Bool full = True;
punk@1 143
punk@1 144 for (Integer x = 0; x < n; x = x + 1)
punk@1 145 full = full && valids[x]._read();
punk@1 146
punk@1 147 return !full;
punk@1 148
punk@1 149 endfunction
punk@1 150
punk@1 151 method Action enq( alpha_T item ) if ( notFull() );
punk@1 152
punk@1 153 Nat k = getNextFree(valids);
punk@1 154 select(valids, k)._write(True);
punk@1 155 select(registers, k)._write(item);
punk@1 156
punk@1 157 endmethod
punk@1 158
punk@1 159 method Action deq() if ( valids[0]._read() );
punk@1 160
punk@1 161 for (Integer x = 0; x < (n-1); x = x + 1)
punk@1 162 begin
punk@1 163
punk@1 164 (registers[x]) <= registers[x + 1]._read();
punk@1 165 (valids[x]) <= valids[x + 1]._read();
punk@1 166
punk@1 167 end
punk@1 168 (valids[n-1]) <= False;
punk@1 169 endmethod
punk@1 170
punk@1 171 method alpha_T first() if ( valids[0]._read() );
punk@1 172 return registers[0]._read();
punk@1 173 endmethod
punk@1 174
punk@1 175 method Bool find(search_T sv);
punk@1 176 Bool res = False;
punk@1 177
punk@1 178 for (Integer x = 0; x < n; x = x + 1)
punk@1 179 if ( valids[x]._read() && searchfunc1(sv, registers[x]._read()) )
punk@1 180 res = True;
punk@1 181
punk@1 182 return res;
punk@1 183
punk@1 184 endmethod
punk@1 185
punk@1 186 method Bool find2(search_T sv);
punk@1 187 Bool res = False;
punk@1 188
punk@1 189 for (Integer x = 0; x < n; x = x + 1)
punk@1 190 if ( valids[x]._read() && searchfunc2(sv, registers[x]._read()) )
punk@1 191 res = True;
punk@1 192
punk@1 193 return res;
punk@1 194
punk@1 195 endmethod
punk@1 196
punk@1 197 method Action clear();
punk@1 198
punk@1 199 for (Integer x = 0; x < n; x = x + 1)
punk@1 200 (valids[x]) <= False;
punk@1 201
punk@1 202 endmethod
punk@1 203
punk@1 204 endmodule
punk@1 205
punk@1 206 module mkSizedSFIFO#(Integer n, function Bool searchfunc(search_T s, alpha_T x)) (SFIFO#(alpha_T, search_T))
punk@1 207 provisos
punk@1 208 (Bits#(alpha_T,asz));
punk@1 209
punk@1 210 let foo <- mkSizedSFIFOInternal(n, searchfunc, searchfunc);
punk@1 211 return foo;
punk@1 212
punk@1 213 endmodule