1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //-----------------------------------------------------------------------------
19 /// \class AliMUONGlobalTriggerBoard
20 /// Global trigger implementation:
21 /// - inputs are regional responses
22 /// - output is a 12-bit word
23 /// - 4 bits per trigger level
25 /// \author Rachid Guernane (LPCCFd),
26 /// Corrected by Christian Finck (Subatech)
27 //-----------------------------------------------------------------------------
29 #include "AliMUONGlobalTriggerBoard.h"
33 #include <Riostream.h>
36 ClassImp(AliMUONGlobalTriggerBoard)
39 //___________________________________________
40 AliMUONGlobalTriggerBoard::AliMUONGlobalTriggerBoard(): AliMUONTriggerBoard()
42 /// Default constructor
44 for (Int_t i=0;i<16;i++) fRegionalResponse[i] = 0;
45 for (Int_t i=0;i< 4;i++) fGlobalInput[i] = 0;
46 for (Int_t i=0;i< 4;i++) fMask[i] = 0xffffffff;
49 //___________________________________________
50 AliMUONGlobalTriggerBoard::AliMUONGlobalTriggerBoard(const char *name, Int_t a) : AliMUONTriggerBoard(name, a)
52 /// Standard constructor
54 for (Int_t i=0;i<16;i++) fRegionalResponse[i] = 0;
55 for (Int_t i=0;i< 4;i++) fGlobalInput[i] = 0;
56 for (Int_t i=0;i< 4;i++) fMask[i] = 0xffffffff;
59 //___________________________________________
60 AliMUONGlobalTriggerBoard::~AliMUONGlobalTriggerBoard()
65 //___________________________________________
66 void AliMUONGlobalTriggerBoard::Mask(Int_t index, UInt_t mask)
68 /// mask global trigger board input index with value mask
69 if ( index >= 0 && index < 4 )
75 AliError(Form("Index %d out of bounds (max %d)",index,3));
79 //___________________________________________
80 void AliMUONGlobalTriggerBoard::Response()
82 /// compute the global trigger board
83 /// response according to the algo() method
84 // output from global trigger algorithm
85 // [+, -, US, LS] * [Hpt, Lpt]
86 // transformed to [usHpt, usLpt, lsHpt, lsLpt, sHpt, sLpt] according
87 // to Global Trigger Unit user manual
94 for (Int_t i = 0; i < 16; ++i)
96 t[i] = fRegionalResponse[i];
102 for (Int_t i=0;i<4;i++)
106 for (Int_t j=0;j<rank;j++)
108 UShort_t lthres = Algo(t[2*j],t[2*j+1],"LPT");
110 UShort_t hthres = Algo(t[2*j],t[2*j+1],"HPT"); hthres <<= 4;
112 t[ip] = lthres | hthres;
119 UChar_t sLpt, sHpt, lsLpt, lsHpt, usLpt, usHpt;
120 sLpt = ((t[0] & 0xC) != 0);
121 sHpt = ((t[0] & 0xC0) != 0);
122 lsLpt = ((t[0] & 0x1) != 0);
123 lsHpt = ((t[0] & 0x10) != 0);
124 usLpt = ((t[0] & 0x2 ) != 0);
125 usHpt = ((t[0] & 0x20) != 0);
127 // LSB is zero (trigger choice to send to CTP: sLpt or sHpt)
136 fResponse = sLpt | sHpt | lsLpt | lsHpt | usLpt |usHpt;
141 //___________________________________________
142 UShort_t AliMUONGlobalTriggerBoard::Algo(UShort_t i, UShort_t j, const char *thres)
144 /// global trigger algorithm
145 /// a ,b = reg response = Hpt (+|-|us|ls) | Lpt (+|-|us|ls)
147 TBits a(8), b(8); a.Set(8,&i); b.Set(8,&j);
149 TBits trg1(2), trg2(2), trg(2);
151 if (!strcmp(thres,"LPT"))
153 trg1[0] = a[2]; trg1[1] = a[3];
154 trg2[0] = b[2]; trg2[1] = b[3];
158 trg1[0] = a[6]; trg1[1] = a[7];
159 trg2[0] = b[6]; trg2[1] = b[7];
162 TBits trgLS1(1), trgUS1(1), trgLS2(1), trgUS2(1), trgLS(1), trgUS(1);
164 if (!strcmp(thres,"LPT"))
166 trgLS1[0] = a[0]; trgUS1[0] = a[1];
167 trgLS2[0] = b[0]; trgUS2[0] = b[1];
171 trgLS1[0] = a[4]; trgUS1[0] = a[5];
172 trgLS2[0] = b[4]; trgUS2[0] = b[5];
175 trgLS[0] = ( trg1[0] & trg2[0] ) | ( trg1[1] & trg2[1] ) | trgLS1[0] | trgLS2[0];
176 trgUS[0] = ( trg1[0] & trg2[1] ) | ( trg1[1] & trg2[0] ) | trgUS1[0] | trgUS2[0];
178 trg[0] = trg1[0] | trg2[0];
179 trg[1] = trg1[1] | trg2[1];
194 //___________________________________________
195 void AliMUONGlobalTriggerBoard::BuildGlobalInput()
197 /// build the 4 words (32bits) global input from the regional responses
198 /// the order of regional responses is:
199 /// 1R, 2R, 2-3R, 3R, 4R, 5R, 6R, 7R, 1L, 2L, 2-3L, 3L, 4L, 5L, 6L, 7L
201 for (Int_t i=0;i< 4;i++) fGlobalInput[i] = 0;
205 for (Int_t iReg = 0; iReg < 16; iReg++) {
207 // invert "pair" bits in regional response
208 // [+, -, US, LS] becomes [+, -, LS, US]
209 rs.Set(8,&fRegionalResponse[iReg]);
210 for (Int_t i = 0; i < 4; i++) {
212 rsi[2*i] = rs[2*i+1];
213 rsi[2*i+1] = rs[2*i];
216 rsi[2*i+1] = rs[2*i+1];
220 rsi.Get(®RespInv);
222 if (iReg < 8) { // right
224 fGlobalInput[0] |= (regRespInv & 0x0F) << (4*iReg);
226 fGlobalInput[2] |= ((regRespInv & 0xF0) >> 4) << (4*iReg);
229 fGlobalInput[1] |= (regRespInv & 0x0F) << (4*(iReg-8));
231 fGlobalInput[3] |= ((regRespInv & 0xF0) >> 4) << (4*(iReg-8));
238 //___________________________________________
239 void AliMUONGlobalTriggerBoard::MaskGlobalInput()
241 /// Apply masks to global input and recalculate regional inputs before
242 /// applying the global response
248 for (Int_t i = 0; i < 4; i++) {
249 fGlobalInput[i] &= fMask[i];
250 gitmp[i] = fGlobalInput[i];
253 for (Int_t iReg = 0; iReg < 16; iReg++) {
254 fRegionalResponse[iReg] = 0;
255 if (iReg < 8) { // right
257 fRegionalResponse[iReg] |= (gitmp[0] >> (4*iReg)) & 0xF;
259 fRegionalResponse[iReg] |= ((gitmp[2] >> (4*iReg)) & 0xF) << 4;
262 fRegionalResponse[iReg] |= (gitmp[1] >> (4*(iReg-8))) & 0xF;
264 fRegionalResponse[iReg] |= ((gitmp[3] >> (4*(iReg-8))) & 0xF) << 4;
266 // invert "pair" bits in regional response
267 // [+, -, US, LS] becomes [+, -, LS, US]
268 rs.Set(8,&fRegionalResponse[iReg]);
269 for (Int_t i = 0; i < 4; i++) {
271 rsi[2*i] = rs[2*i+1];
272 rsi[2*i+1] = rs[2*i];
275 rsi[2*i+1] = rs[2*i+1];
279 rsi.Get(®RespInv);
280 fRegionalResponse[iReg] = regRespInv;
285 //___________________________________________
286 void AliMUONGlobalTriggerBoard::Scan(Option_t*) const
288 /// print global trigger output
289 TBits w(7); w.Set(7,&fResponse);
299 iS[0] = (Int_t)w.TestBitNumber(1);
300 iS[1] = (Int_t)w.TestBitNumber(2);
302 Int_t iPU[2] = {w[5],w[6]};
303 Int_t iPL[2] = {w[3],w[4]};
305 printf("============================================\n");
306 printf(" Global Trigger output Low pt High pt\n");
307 printf(" number of Single :\t");
308 for (Int_t i=0; i<2; i++) printf("%i\t",iS[i]);
310 printf(" number of UnlikeSign pair :\t");
311 for (Int_t i=0; i<2; i++) printf("%i\t",iPU[i]);
313 printf(" number of LikeSign pair :\t");
314 for (Int_t i=0; i<2; i++) printf("%i\t",iPL[i]);
316 printf("===================================================\n");