CAEN V814
Contents
1. A DNA 10 11 9 aoma o a lt 3 pa A QS z O o OUT 7 4 5 2 aa Aa O 1 6 Fig 2 1 Mod V 814 front panel NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 10 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 2 4 External connectors External connectors The location of the connectors is shown in Fig 2 1 Their function and electromechanical specifications are listed in the following subsections 2 4 1 INPUT connectors INPUT CHANNELS VETO INPUT TEST INPUT 2 4 2 OUTPUT connectors OUTPUT CHANNELS OR OUTPUT NPO Filename 00101 97 V814x MUTx 03 V814 REV3 DOC Mechanical specifications 16 LEMO 00 type connectors Electrical specifications negative polarity 50 Ohm impedance DC coupling ratings V814 1 400 mV V814 P 1400 mV 60 MHz maximum input frequency Mechanical specifications 1 LEMO 00 type connectors Electrical specifications standard NIM logic signal high impedance 20 ns minimum FWHM leading edge of the VETO signal must precede of at least 8 ns the leading edge of the input and overlap completely the input signal acts on all signals Mechanical specifications 1 LEMO 00 type connectors Electrical specifications2. Power ON Reset status 4 2 At power ON the contents of all the module s registers are not determined A setting of the registers must be performed before any other operation Enabling Disabling the channels 4 3 The User can enable or disable each of the 16 channels via VME by performing a VME write access at Base address 4A A channel is enabled if the corresponding bit of the Pattern of Inhibit is high e g bin 1111 1111 1111 0011 or hex FFF3 disables channels 2 and 3 of the discriminator Enabling Disabling the channels 4 4 The User can enable or disable each of the 16 channels via VME by performing a VME write access at Base address 4A A channel is enabled if the corresponding bit of the Pattern of Inhibit is high e g bin 1111 1111 1111 0011 or hex FFF3 disables channels 2 and 3 of the discriminator Test Veto and Or signals NPO Some operations can be performed by sending two external NIM signals e TEST an input signal sent through this connector triggers all the enabled channels at once This feature allows to test of the module as well as to generate a pattern of pulses suitable to test any following electronics e VETO an input signal sent through this connector allows to veto all channels simultaneously A veto pulse of width T will inhibit the input channels for a period with a T duration Its leading edge must precede the input signal leading edge by at least 8 ns and overlap comple
3. 00101 97 V814x MUTx 03 V814 REV3 DOC 22 4 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 1 General description 1 1 NPO Functional description The CAEN Model V814 is a 16 CHANNEL LOW THRESHOLD DISCRIMINATOR housed in a single width VME module The module accepts 16 either negative or positive inputs and produces 16 differential ECL outputs with a fan out of two on four front panel flat cable connectors a functional block diagram is shown in Fig 1 2 Input and output stages are independently organized for each channel Each channel can be turned on or off via VME by using a mask register Pattern of Inhibit The timing stage of the discriminator produces an output pulse whose width is adjustable in a range from 6 to 95 ns via VME The discriminator thresholds are individually settable in a range from 1 mV to 255 mV 1 mV step via VME through an 8 bit DAC a positive input version Model V814 P with the thresholds settable in the 1 mV to 255 mV range is also available VETO and TEST inputs are available on the front panel On the front panel a Current Sum output is also available that generates a current proportional to the input multiplicity i e to the number of channels over threshold at a rate of 1 0 mA per hit 50 mV per hit into a 50 Ohm load 20 A MAJORITY output connector provides a NIM signal if the number of input c
4. CHANNELS TEST se o EE OO W AO AO OR R SEA 19 4 6 SETTING THE THRESHOLD c eg O OCE agape ACTON PTA eee ea 19 NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 3 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 4 7 SETTING THE OUTPUT PULSE WIDTH gwia ne io a rad 19 4 8 CURRENT SUM IN NN 19 4 9 MAJORITY SETTING n oc A 20 LIST OF FIGURES FIG JT MODEL TYPE LABEL EXAMPLE e a ao GO W R A LARW NO tii 6 FIG 1 2 BLOCK DIAGRAM u W ERO AAAA O Oe SU nee CERA AAA EA I BIG 2 12 MOD V 814 FRONT YANI D RAEE ER EEEE EEEE n tee 2e Oro 10 BIG 2 2 COMPONENTS LOCATION 00 A A Nu 13 FIG 2 3 JUMPERS LOCATION see desce io O ES E ESTEE EE EEE Od AE EEEE EEES ue 14 FIG 3 15 MODULE IDENTIFIER WORDS e lan OR WA REA AE 17 FIG 4 1 CURRENT SUM SIGNAL rene tn ns A nee Mon A nee PE nan nee Met lt 20 FIG 4 2 EXAMPLE OF THREE DAISY CHAINED V814 een 22 LIST OF TABLES TABLE 1 1 VERSIONS AVAILABLE FOR THE MODEL V814 eee eee ee ooo owane eee 6 TABLE 1 2 TECHNICAL SPECIFICATION TABLE ss eee aaa aaa aaa aaa aaa aaa aaa aaa aa aaa aaa nr nono aaa aa wawa ae eaaaaaaaaaaa zacza 8 FABLE 2 1 POWER REQUIREMENTS trier di YO OO entente AE 9 TABLE 3 13 ADDRESS MAP ed ORA R OT OO AA EA terne 15 TABLE 4 1 MAJORITY LEVEL SETTING VALUES moooi teese e is iE EET EE NR EO ETEO E ESR 20 NPO Filename Number of pages Page
5. standard NIM logic signal high impedance 5ns minimum FWHM 60 MHz maximum input frequency Mechanical specifications 4 Header 3M 3408 D202 type 8 8 pin connectors Electrical specifications Differential ECL level on 110 Ohm impedance pulse width adjustment from 6 1 ns to 95 7 ns Input Output delay 10 5 1 5 ns Mechanical specifications 1 LEMO 00 type connectors Electrical specifications standard NIM logic signal 50 Q impedance Number of pages Page 22 11 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 2 OUTPUT Mechanical specifications 1 LEMO 00 type connectors Electrical specifications current output 1 mA 20 per hit high impedance MAJORITY OUTPUT Mechanical specifications 1 LEMO 00 type connectors Electrical specifications standard NIM logic signal 50 Q impedance 2 5 Other components 2 5 1 Displays The front panel hosts the following LEDs DTACK Type 1 green LED Function VME selected it lights up during a VME access OR Type 1 green LED Function it lights up if at least one output signal is present 2 5 2 Switches ROTARY SWITCHES Function they allow to select module s VME address please refer to Fig 2 2 for their setting 2 5 3 Jumpers JP1 Function it allows to select the Majority logic Internal External please refer to Fig 2 3 for the jumper location on the V8
6. to use a Majority level of 5 the correct MAJTHR value to use is 56 3 8 Test pulse Base address 4C write only A test pulse on all output channels can be generated by performing a write access at Base address 4C the test pulse is generated independently from the number written into this register 3 9 Module identifier words Base address FA FC FE read only Three words located at the address Base FA FC FE of the page are used to identify the module as shown in Fig 3 1 15 14 13 12 11109 8 7 6 5 4 3 2 1 0 Address Version Module s serial number Base FE Manufacturer number Module type Base FC FA Fixed code F5 Fixed code Base FA Fig 3 1 Module Identifier Words At the address Base FA the two particular bytes allow the automatic localization of the module For the Mod V814 the word at the address Base FC has the following configuration Manufacturer N 000010 b Type ofmodule 0001010011 The word located at the address Base FE identifies the single module via a serial number and any change in the hardware for example the use of faster conversion logic will be shown by the version number NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 17 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 4 Principles of operation 4 1
7. 14 board NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 12 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 Channels 8 to 14 Fee Flat Cable Connectors A B 0 KZ Base address bit lt 23 20 gt A 68 Rotary switches for lt 07 Base Address selection Se Base address bit lt 19 16 gt gt S Es g gt Discriminator O Ch 14 Ch 15 LL VME P1 N connector Discriminator Ch 12 Ch 13 J Na Discriminator Ch 10 Ch 11 O Rotary switches for Base Address selection Discriminator il Zak lor Ch 8 Ch 9 Test x ri MAJ A h Discriminator q ri SUM ACE Pate DEE Ch 6 Ch 7 VME PAUX connector Discriminator Flat Cable Ch 4 Ch 5 Connectors A B 8 VME P2 PNE connector Discriminator Ch 2 Ch 3 a f er Channels 0 to 7 Discriminator FONA el Ch 0 Ch 1 k O Component side of the board Base address bit lt 31 28 gt Rotary switches for Base Address sele
8. S een enreenre ere 11 2 4 1 INPUT CONNECIO EE EIE ue een AEE E EEE EE dt aia 11 2 4 2 OUWTP YT CONRCCLONS Vk Rook Ek A BoA east ee Nese te ie Seta ni ae ibe aoc ek Il 2 3 OTHER COMPONENIS za z ne Hd dO Wo WRZ PO Rene die nee te 12 23 12 A B1 AR A RT RE RE AE O 12 2 5 2 SWILCHESZ ON RER AZ REAR CE NO OE AOI AES A Mer 12 2 5 3 TUM POLS NOAA ORO tar ENO AAA R ROW ORDO 12 3 VIME INTE REA CIE e i oto ocb T POOR soesersdectevestactsedssnstenss 15 3 1 ADDRESSING CAPABILITY se ony ooo ESE ne EEE RSS assi POPOWE 15 32 GEOGRAPHICAL AD R E S S SEEN BRON R Al de 16 3 3 DISCRIMINATOR THRESHOLD iis ie A On RZA ttes 16 34 PATTERN OF INHIBIT ycia A A ONE GOW OI WIATA WEJ 16 3 5 OUTPUT WIDTH CH 0 TOT aaa wd ni AU le ne nent eee w p dosc 16 3 6 OUTPUT WIDTH CHESS TO I She a ia 16 3 77 MAJORITY THRESHOLD ioen tn nement rene nn aiii 17 358 TEST PULSE aa AA ani 17 3 9 MODULE IDENTIFIER WORDS recrutements O II 17 4 PRINCIPLES OF OPERATION 1220000 1000000000000000000000000000000000000000000000000000000000000000000000000000 18 41 POWERON ZRESET STATUS miii EYE A A OT AA 18 4 2 ENABLING DISABLING THE CHANNELS cecssessressceceeresseeceesecatesecsevsccuaceceeaecaseaecseseccnacnesaecaseaecaeeerenee 18 4 3 ENABLING DISABLING THE CHANNELS sesssesscesscseesecsseeesesecatesecuevscesaceccesecesaecsesseenacsneeaecasnecaeeerenee 18 AA TEST VETO AND OR SIGNALS aaa A WWO GA ER w Kid AAA W ALLA 18 4
9. Technical Information Manual Revision n 3 6 September 2002 MOD V 814 series 16 CHANNEL LOW THRESHOLD NPO DISCRIMINATORS 00101 97 V814x MUTx 03 CAEN will repair or replace any product within the guarantee period if the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations CAEN declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly the CAEN User s Manual before any kind of operation CAEN reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 TABLE OF CONTENTS 1 GENERATE DESCRIPTION lt lt nee dA da ide ia doda tea 5 151 FUNCTIONAL DESCRIPTION ora andi ON id ARA ENAR A GA 5 Vids BLOCK DIAGRAM GG znad aka Ran o LARA O EC 7 1 3 TECHNICAL SPECIFICATION TABLE uan 8 2 TECHNICAL SPECIFICATIONS 220 12200000000000000000000000000000000000000000000000000000000000000000000000000000000 9 Dl PACKAGING e A ed e aca o es RA e AA 9 2 2 A EIKO D TEANN KAE E iros segues 9 213 ERONTPANEDA A A A AE 10 2 4 EXTERNAL CONNECTORS EXTERNAL CONNECTOR
10. back boards plugged into the main printed circuit board see Fig 2 2 The Base address can be selected in the range 00 0000 lt gt FF 0000 A24 mode 0000 0000 lt gt FFFF 0000 A32 mode The module s address lines A09 A15 are not connected so their content is meaningless for example writing to either Base 104C or Base 284C the same register is accessed Table 3 1 Address Map ADDRESS REGISTER CONTEN T Base 00 Base 02 Base 04 Base 06 Base 08 Base 0A Base 0C Base 0E Base 10 Base 12 Base 14 Base 16 Base 18 Base 1A Base 1C Base 1E Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch Threshold register Ch J O O1 BR ND Base 40 Output width register Ch 0 to 7 Write only Base 42 Output width register Ch 8 to 15 Write only Base 48 Majority threshold register Write only Base FA Fixed code Read only Base FC Manufacturer amp Module type Read only Base FE Version amp Serial number Read onl NPO Filename Number of pages Page 00101 97 V814x MUTx 03 15 V814 REV3 DOC 22 Document type Title Revision date Re
11. ction Base address bit lt 27 24 gt Fig 2 2 Components location NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 13 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 VME P1 connector a Internal N JJP1 I External _L__J VME PAUX connector VME P2 connector AT Components side Fig 2 3 Jumpers location NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 14 Document type Title User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator Revision date Revision 06 09 2002 3 3 VME Interface 3 1 Addressing capability The V814 module works in A24 A32 mode This implies that the module s address must be specified in a field of 24 or 32 bits The address modifiers codes recognized by the module are AM 39 Standard user data access AM 3D Standard supervisor data access AM 09 Extended user data access AM 0D Extended supervisor data access The module s Base address is fixed by 4 Internal rotary switches housed on two piggy
12. e width value of the channels O through 7 on a 8 bit word This value can be adjusted in the range from 6 ns to 95 ns writing an integer number between 0 and 255 into the register The set value corresponds to the width as follows 255 leads to a 95 ns pulse duration O leads to a 6 ns pulse duration with a non linear relation for intermediate values Output width Ch 8 to 15 Base address 42 write only This register contains the output pulse width value of the channels 8 through 15 on a 8 bit word This value can be adjusted in the range from 6 ns to 95 ns writing an integer number between 0 and 255 into the register The set value corresponds to the width as follows 255 leads to a 95 ns pulse duration O leads to a 6 ns pulse duration with a non linear relation for intermediate values Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 16 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 3 7 Majority threshold Base address 48 write only This register allows to set the Majority threshold between 1 and 16 for Internal Majority and between 1 and 20 for External Majority writing a proper value in the Base address 48 value range 1 to 244 The relation to use is the following MAJTHR NINT MAJLEV 50 25 4 where NINT is the nearest integer function allowed values for MAJLEV 1 to 20 e g if the User wants
13. hannels over threshold exceeds the MAJORITY programmed value The logic OR of discriminator output is available on a front panel connector The relevant OR LED lights up if at least one of the unmasked channels is over threshold The module s operations are completely controlled via software for each channel through the VME bus The most important are e setting the discriminator thresholds 8 bit from 1 to 255 mV V814 P 1 255 mV e setting Pattern of Inhibit each channel can be turned ON or OFF by using a mask register e setting output width in a range from 6 to 95 ns e setting the Majority threshold value e common TEST Several versions of the module are available please refer to Table 1 1 for details Filename Number of pages Page 5 00101 97 V814x MUTx 03 V814 REV3 DOC 22 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 Table 1 1 Versions available for the Model V814 Version Number of PAUX Input type channels connector V814 16 yes Negative V814 P 16 yes Positive V814B 16 no Negative V814 PB 16 no Positive WV814XBAAAAA MAY 5th 2002 Fig 1 1 Model type label example V814 B A label on the printed board soldering side indicates the module s version see Fig 1 1 all the versions share the same features except where indicated The version with the PAUX connect
14. med majority level MAJLEV MAJLEV can be programmed between 1 and 16 writing a proper value MAJTHR in the Majority threshold register see 3 7 valid values range between 0 and 255 MAJTHR can be calculated in the following way MAJTHR NINT MAJLEV 50 25 4 where NINT is the Nearest Integer 1 2 3 4 5 6 7 8 9 0 Table 4 1 Majority Level setting values NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 20 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 The Majority logic can be switched from an Internal to an External position by means of an internal Jumper see Fig 2 3 Internal With the jumper on the Internal position Majority output provides an active signal if the number of the active channels of the module exceeds the programmed majority level MAJLEV In this case valid values of MAJLEV are from 1 to 16 External Several modules can be connected in daisy chain via the Z outputs In this case by setting the Jumper to the External position the Majority logic will act on the sum of the 2 outputs of the connected modules The majority signal will be active if the sum of chained modules active channels exceeds or is equal to the programmed MAJLEV An example with three chained modules is shown in Fig 4 2 The 2 output line must be terminated with 50 Ohm NPO Filename N
15. nstant fraction of the input signals In order to write the Threshold for each channel the User must perform a VME access at Base address 00 to 1E Setting the output pulse width The output pulse width is adjustable on 8 bit from 15 to 250 ns set values 0 to 255 and the chosen value is applied to each group of 8 channels each It can be set at Base address 40 for channels O to 7 and at Base address 42 for channels 8 to 15 The set value corresponds to the Width as follows 255 leads to a 250 ns value 0 leads to a 15 ns value with a non linear interpolation for intermediate values Current Sum signal The front panel also houses the Current Sum 2 output connector which provides a current proportional to the input signal multiplicity i e to the number of channels over threshold at a rate of 1 0 mA per hit 50 mV per hit into a 50 Ohm load 20 Note The Z output requires a 50 Ohm termination for a correct operation of the Majority logic Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 19 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 Channel 1 IE NINE Channel 2 E Channel 3 Current Sum gt mA Fig 4 1 Current Sum signal 4 9 Majority setting Majority output provides a standard NIM signal if the number of channels over threshold exceeds the program
16. or requires the V430 backplane Models available exclusively on request NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 6 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 1 2 Block diagram ZN 7 x A DACS TEST Y N INHIBIT y ra R e SN W WLOGIC N 8 bit 8 bit 8 bit 8 bit 8 bit inhibit DAC DAC DAC DAC DAC MAJ ch 0 ch 1 ch14 ch 15 THRESHOLDS TEST AND N WIDTH VME p Wo INTERFACE v y gt M INPUTS lt 0 15 gt REA MAJ diser discr diser discr Y ch 0 ch 1 ch 14 ch 15 N TEST 5 pS i VETO GUTPUTS 0 gt A B E E za z OROUT A Se 7 OR LED Fig 1 2 Block Diagram NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 7 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 1 3 Technical specification table Table 1 2 Technical specification table Threshold range V814 V814B 1 255 mV V814 P PB 1 255 mV 1 mV step Interchannel insulation 54 dB for 2 5 ns rise time input signals NIM logic signals high impedance VETO allows vetoing of all channels sim
17. tely the input signal Note TEST and VETO are high impedance inputs and each one is provided with two bridged connectors for daisy chaining the chain has to be terminated on 50 Ohm on the last module the same is needed also if one module only is used whose inputs have thus to be properly matched Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 18 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 4 5 4 6 4 7 4 8 NPO e An OR output connector provides also the logical OR of the output channels The relevant OR LED lights up if at least one of the enabled channels is over threshold Channels test It is possible to obtain pulses on all channels e by sending a NIM pulse through one of the two TEST connectors located on the front panel e by performing a Write operation at Base address 4C Setting the threshold For each channel of the V814 the discriminator threshold is set up via an 8 bit DAC The threshold values can be programmed in a range from 1 mV to 255 mV with 1 mV steps set values 1 to 255 the V814 P accepts positive pulses thus the threshold ranges from 1 to 255 mV step 1 mV As in all Constant Fraction Discriminators these thresholds are to be set above the noise level they do NOT correspond to the actual level that triggers the discriminator outputs the latter being a co
18. ultaneously TEST triggers all the enabled channels at once Control inputs MAJORITY standard NIM logic signal 50 Q impedance it indicates if the number of input channels over threshold exceeds Control outputs the MAJORITY level programmed via VME OR standard NIM signal 50 Q impedance logic OR of outputs 2 current proportional to input multiplicity 1 mA 20 per hit high impedance DTACK green LED lights up at each VME access Displays OR green LED it lights up if at least one output signal is present NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 8 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 2 Technical Specifications 2 1 Packaging The modules are housed in 6U high 1U wide VME units The Mod V814 V814 P is provided with P1 P2 and PAUX connectors The Mod V814 B V814 PB is provided with P1 P2 connectors NO PAUX 2 2 Power requirements The power requirements of the various versions are as follows Table 2 1 Power requirements Power supply V814 V814 P V814 B V814 PB no PAUX 100 mA 100 mA 800 mA sv 88A es l NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 9 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 2 3 Front Panel Mod V814 A A e Y 15
19. umber of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 21 Document type Title Revision date Revision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 AAA ATA ee eS ee A A E Mai State INT gt z Maj State INT gt e Mai State EXT gt zg ce 8 ce ee 0 8 ee o o se oe Majority State INT INT Majority Level MAJLEV referred to ety over th referred to a over th referred to all chained modules channel channel over th channels Number of Module s 4 active Channels Majority Output ACTIVE NON Active ACTIVE 5 gt MAJLEV 4 lt MAJLEV 5 4 3 gt MAJLEV Fig 4 2 Example of three daisy chained V814 NPO Filename Number of pages Page 00101 97 V814x MUTx 03 V814 REV3 DOC 22 22
20. vision User s Manual MUT Mod V814 16 Channel Low Threshold Discriminator 06 09 2002 3 3 2 Geographical address 3 3 3 4 3 5 3 6 NPO The board can be addressed via geographical addressing i e according to its position in the crate neglecting the rotary switches configuration by specifying address modifier AM 0x2F Each slot of the VME crate is identified by the status of the SN5 SN1 lines of the JAUX for example the slot 5 will have these lines respectively at 00101 and consequently the module inserted in the slot 5 will have a GEO address set to 00101 The geographical address works in A24 mode only The complete address in A24 mode for geographical addressing is A 31 24 don t care A 23 19 GEO A 18 16 0 A 15 0 offset Discriminator threshold Base address 00 to 1E write only These registers contain the discriminator threshold values on 8 bit words The threshold values can be programmed in a range from 1 mV to 255 mV Mod V814 P 1 to 255 mV with 1 mV steps writing an integer number between 0 and 255 into the register the channel thresholds are individually settable Pattern of Inhibit Base address 4A write only This register contains the Pattern of Inhibit a 16 bit word indicating which channels are either enabled or disabled bit X 1 gt Ch X enabled bitX 0 Ch X disabled Output width Ch O to 7 Base address 40 write only This register contains the output puls
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