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 //____________________________________________________________________
20 // Mapping of ALTRO hardware channel to detector coordinates
22 #include "AliFMDAltroMapping.h" // ALIFMDALTROMAPPING_H
23 #include "AliFMDParameters.h"
26 //____________________________________________________________________
27 ClassImp(AliFMDAltroMapping)
29 ; // This is here to keep Emacs for indenting the next line
32 //_____________________________________________________________________________
33 AliFMDAltroMapping::AliFMDAltroMapping()
37 //_____________________________________________________________________________
39 AliFMDAltroMapping::ReadMapping()
44 //_____________________________________________________________________________
46 AliFMDAltroMapping::DeleteMappingArrays()
49 //____________________________________________________________________
51 AliFMDAltroMapping::Hardware2Detector(UInt_t ddl, UInt_t addr,
52 UShort_t& det, Char_t& ring,
53 UShort_t& sec, UShort_t& str) const
55 // Translate a hardware address to detector coordinates.
56 // The detector is simply
60 // The ring number, sector, and strip number is given by the addr
61 // argument. The address argument, has the following format
64 // +-------------+----------+----------+
65 // | Board | ALTRO | Channel |
66 // +-------------+----------+----------+
68 // The board number identifier among other things the ring. There's
69 // up to 4 boards per DDL, and the two first (0 and 1) corresponds
70 // to the inner rings, while the two last (2 and 3) corresponds to
73 // The board number and ALTRO number together identifies the sensor,
74 // and hence. The lower board number (0 or 2) are the first N / 2
75 // sensors (where N is the number of sensors in the ring).
77 // There are 3 ALTRO's per card, and each ALTRO serves up to 4
78 // sensors. Which of sensor is determined by the channel number.
79 // For the inner rings, the map is
81 // ALTRO 0, Channel 0 to 7 -> Sensor 0 or 5
82 // ALTRO 0, Channel 8 to 15 -> Sensor 1 or 6
83 // ALTRO 1, Channel 0 to 7 -> Sensor 2 or 7
84 // ALTRO 2, Channel 0 to 7 -> Sensor 3 or 8
85 // ALTRO 2, Channel 8 to 15 -> Sensor 4 or 9
87 // For the outer rings, the map is
89 // ALTRO 0, Channel 0 to 3 -> Sensor 0 or 10
90 // ALTRO 0, Channel 4 to 7 -> Sensor 1 or 11
91 // ALTRO 0, Channel 8 to 11 -> Sensor 2 or 12
92 // ALTRO 0, Channel 12 to 15 -> Sensor 3 or 13
93 // ALTRO 1, Channel 0 to 3 -> Sensor 4 or 14
94 // ALTRO 1, Channel 4 to 7 -> Sensor 5 or 15
95 // ALTRO 2, Channel 0 to 3 -> Sensor 6 or 16
96 // ALTRO 2, Channel 4 to 7 -> Sensor 7 or 17
97 // ALTRO 2, Channel 8 to 11 -> Sensor 8 or 18
98 // ALTRO 2, Channel 12 to 15 -> Sensor 9 or 19
100 // Which divison of the sensor we're in, depends on the channel
101 // number only. For the inner rings, the map is
103 // Channel 0 -> Sector 0, strips 0-127
104 // Channel 1 -> Sector 1, strips 0-127
105 // Channel 3 -> Sector 0, strips 128-255
106 // Channel 4 -> Sector 1, strips 128-255
107 // Channel 5 -> Sector 0, strips 256-383
108 // Channel 6 -> Sector 1, strips 256-383
109 // Channel 7 -> Sector 0, strips 384-511
110 // Channel 8 -> Sector 1, strips 384-511
112 // There are only half as many strips in the outer sensors, so there
113 // only 4 channels are used for a full sensor. The map is
115 // Channel 0 -> Sector 0, strips 0-127
116 // Channel 1 -> Sector 1, strips 0-127
117 // Channel 3 -> Sector 0, strips 128-255
118 // Channel 4 -> Sector 1, strips 128-255
120 // With this information, we can decode the hardware address to give
121 // us detector coordinates, unique at least up a 128 strips. We
122 // return the first strip in the given range.
124 det = (ddl - AliFMDParameters::kBaseDDL) + 1;
125 UInt_t board = (addr >> 7) & 0x1F;
126 UInt_t altro = (addr >> 4) & 0x7;
127 UInt_t chan = (addr & 0xf);
129 AliError(Form("Invalid board address %d for the FMD", board));
133 AliError(Form("Invalid ALTRO address %d for the FMD digitizer %d",
137 ring = (board > 1 ? 'O' : 'I');
138 UInt_t nsen = (ring == 'I' ? 10 : 20);
139 UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
140 UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
141 UInt_t sen = (board % 2) * nsen / 2; // Base for half-ring
142 sen += chan / ncs + (altro == 0 ? 0 :
143 altro == 1 ? nsa : UInt_t(1.5 * nsa));
144 sec = 2 * sen + (chan % 2);
145 str = (chan % ncs) / 2 * 128;
149 //____________________________________________________________________
151 AliFMDAltroMapping::Detector2Hardware(UShort_t det, Char_t ring,
152 UShort_t sec, UShort_t str,
153 UInt_t& ddl, UInt_t& addr) const
155 // Translate detector coordinates to a hardware address.
158 // kBaseDDL + (det - 1)
160 // The ring number, sector, and strip number must be encoded into a
161 // hardware address. The address argument, will have the following
165 // +-------------+----------+----------+
166 // | Board | ALTRO | Channel |
167 // +-------------+----------+----------+
169 // The board number is given by the ring and sector. The inner
170 // rings board 0 and 1, while the outer are 2 and 3. Which of these
171 // depends on the sector. The map is
173 // Ring I, sector 0- 9 -> board 0
174 // Ring I, sector 10-19 -> board 1
175 // Ring O, sector 0-19 -> board 2
176 // Ring O, sector 20-39 -> board 3
178 // There are 3 ALTRO's per board. The ALTRO number is given by the
179 // sector number. For the inner rings, these are given by
181 // Sector 0- 3 or 10-13 -> ALTRO 0
182 // Sector 4- 5 or 14-15 -> ALTRO 1
183 // Sector 6- 9 or 16-19 -> ALTRO 2
185 // For the outers, it's given by
187 // Sector 0- 7 or 20-27 -> ALTRO 0
188 // Sector 8-11 or 28-31 -> ALTRO 1
189 // Sector 12-19 or 32-39 -> ALTRO 2
191 // The channel number is given by the sector and strip number. For
192 // the inners, the map is
194 // Sector 0, strips 0-127 -> Channel 0
195 // Sector 0, strips 128-255 -> Channel 2
196 // Sector 0, strips 256-383 -> Channel 4
197 // Sector 0, strips 384-511 -> Channel 6
198 // Sector 1, strips 0-127 -> Channel 1
199 // Sector 1, strips 128-255 -> Channel 3
200 // Sector 1, strips 256-383 -> Channel 5
201 // Sector 1, strips 384-511 -> Channel 7
202 // Sector 2, strips 0-127 -> Channel 8
203 // Sector 2, strips 128-255 -> Channel 10
204 // Sector 2, strips 256-383 -> Channel 12
205 // Sector 2, strips 384-511 -> Channel 14
206 // Sector 3, strips 0-127 -> Channel 9
207 // Sector 3, strips 128-255 -> Channel 11
208 // Sector 3, strips 256-383 -> Channel 13
209 // Sector 3, strips 384-511 -> Channel 15
211 // and so on, up to sector 19. For the outer, the map is
213 // Sector 0, strips 0-127 -> Channel 0
214 // Sector 0, strips 128-255 -> Channel 2
215 // Sector 1, strips 0-127 -> Channel 1
216 // Sector 1, strips 128-255 -> Channel 3
217 // Sector 2, strips 0-127 -> Channel 4
218 // Sector 2, strips 128-255 -> Channel 6
219 // Sector 3, strips 0-127 -> Channel 5
220 // Sector 3, strips 128-255 -> Channel 7
221 // Sector 4, strips 0-127 -> Channel 8
222 // Sector 4, strips 128-255 -> Channel 10
223 // Sector 5, strips 0-127 -> Channel 9
224 // Sector 5, strips 128-255 -> Channel 11
225 // Sector 6, strips 0-127 -> Channel 12
226 // Sector 6, strips 128-255 -> Channel 14
227 // Sector 7, strips 0-127 -> Channel 13
228 // Sector 7, strips 128-255 -> Channel 15
230 // and so on upto sector 40.
232 // With this information, we can decode the detector coordinates to
233 // give us a unique hardware address
235 ddl = AliFMDParameters::kBaseDDL + (det - 1);
236 UInt_t nsen = (ring == 'I' ? 10 : 20);
237 UInt_t nsa = (ring == 'I' ? 2 : 4); // Sensors per ALTRO
238 UInt_t ncs = (ring == 'I' ? 8 : 4); // Channels per sensor
239 UInt_t bbase = (ring == 'I' ? 0 : 2);
240 UInt_t board = bbase + sec / nsen;
241 UInt_t lsec = (sec - (board - bbase) * nsen); // Local sec in half-ring
242 UInt_t altro = (lsec < 2 * nsa ? 0 : (lsec < 3 * nsa ? 1 : 2));
243 UInt_t sbase = (altro == 0 ? 0 : altro == 1 ? 2 * nsa : 3 * nsa);
244 UInt_t chan = (sec % 2) + (lsec-sbase) / 2 * ncs + 2 * (str / 128);
245 AliDebug(40, Form("\n"
246 " chan = (%d %% 2) + (%d-%d) / %d * %d + 2 * %d / 128\n"
247 " = %d + %d + %d = %d",
248 sec, lsec, sbase, 2, ncs, str,
249 (sec % 2), (lsec - sbase) / 2 * ncs,
250 2 * (str / 128), chan));
251 addr = chan + (altro << 4) + (board << 7);
256 //____________________________________________________________________
258 AliFMDAltroMapping::GetHWAddress(Int_t sec, Int_t str, Int_t ring) const
260 // Return hardware address corresponding to sector sec, strip str,
261 // and ring ring. Mapping from TPC to FMD coordinates are
270 Char_t r = Char_t(ring);
271 if (!Detector2Hardware(1, r, sec, str, ddl, hwaddr))
276 //____________________________________________________________________
278 AliFMDAltroMapping::GetPadRow(Int_t hwaddr) const
280 // Return sector corresponding to hardware address hwaddr. Mapping
281 // from TPC to FMD coordinates are
293 Int_t ddl = AliFMDParameters::kBaseDDL;
294 if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
298 //____________________________________________________________________
300 AliFMDAltroMapping::GetPad(Int_t hwaddr) const
302 // Return strip corresponding to hardware address hwaddr. Mapping
303 // from TPC to FMD coordinates are
315 Int_t ddl = AliFMDParameters::kBaseDDL;
316 if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
320 //____________________________________________________________________
322 AliFMDAltroMapping::GetSector(Int_t hwaddr) const
324 // Return ring corresponding to hardware address hwaddr. Mapping
325 // from TPC to FMD coordinates are
337 Int_t ddl = AliFMDParameters::kBaseDDL;
338 if (!Hardware2Detector(ddl, hwaddr, det, ring, sec, str)) return -1;
342 //_____________________________________________________________________________