This is the Final Official Definition of the L1.5 Trigger Connection to and Operation with the Muon System ----------------------------------------------------------- Rev. 8-APRIL-1992 +--------------------------------+ | Input Information | |from the Level 1.5 Muon Trigger | |to the Level 1 Trigger Framework| +--------------------------------+ The Level 1.5 Muon Trigger System provides 16 Answer Signals for input to the Level 1.5 Trigger Decision. In addition the Muon System provides 16 Done Signals which indicate the validity of the information on the Answer Signal lines. The meaning of each Level 1.5 Muon Answer Signal line is set by COOR (as described in COOR's trigger definition files). COOR communicates with the Level 1.5 Muon System to program the meaning of these Answer Signal lines. These 16 Muon L1.5 Answer Signals are received by the Level 1 Trigger Framework and made available as 16 Level 1.5 Terms for the programming of Specific Triggers. A Resource file read by COOR describes the mapping of the 16 Level 1.5 Muon Answer Signals to 16 of the Level 1.5 Terms. COOR communicates with the Trigger Control Computer (TCC) to program the requirements made on each Specific Trigger. COOR will identify which Specific Triggers need a Level 1.5 confirmation. COOR will make Level 1 requirements and Level 1.5 requirements on those Specific Triggers. The requirements made on the Level 1.5 terms for a given Specific Trigger are set by COOR on the basis of their physical term number. A L1.5 Cycle begins when one or more Specific Triggers have fired which require L1.5 confirmation and no Specific Trigger has fired which does not require L1.5 confirmation. A L1.5 Cycle consists of one or more L1.5 Decision Tests. There is one L1.5 Decision Test per Beam Crossing cycle. The first L1.5 Desision Test is made on the Beam Crossing cycle which follows the Beam Crossing cycle in which the Specific Trigger(s) fired which require L1.5 confirmation. Each L1.5 Decision Test has one of 4 possible out comes: 1. IF not all of the contributing Done signals are active, and if for all of the contributing Done signals that are active their accompanying Answer signals are True, and if the L1.5 cycle has not timed out; THEN continue the L1.5 cycle, wait for the next beam crossing cycle and made another L1.5 decision test. 2. IF not all of the contributing Done signals are active, and if for all of the contributing Done signals that are active their accompanying Answer signals are True, and if the L1.5 cycle has timed out; THEN conclude the L1.5 cycle on this beam crossing cycle with a positive L1.5 answer (i.e. continue taking this event). 3. IF all of the contributing Done signals are active, and if none of their accompanying Answer signals is False; THEN conclude the L1.5 cycle on this beam crossing cycle with a positive L1.5 answer (i.e. continue taking this event). 4. IF for any of the contributing Done signals that are active, their accompanying Answer signal is False; THEN conclude the L1.5 cycle on this beam crossing cycle with a negative L1.5 answer (i.e. stop the acquisition cycle that is taking this event). A L1.5 Cycle ends when either: the time out is reached, a positive L1.5 result is reached, or else when a negative L1.5 result is reached. It is a fundamental part of the L1.5 definition that no addition L1 triggers are sent out from the Trigger Framework as long as the L1.5 cycle is in progress. The L1.5 Done and Answer signals are sampled at a given point in the Beam Crossing cycle. This may or may not be the same point in the Beam Crossing cycle where the L1 And-Or Input Terms are latched. 1. A given Level 1.5 Muon Done signal will go low in response to a rising Start Digitize for a sector used in that Level 1.5 Muon Answer. 2. A given Level 1.5 Muon Done signal will be set high at the Trigger Framework at least 50 nanoseconds before the Trigger Framwork sampling time. 3. A given Level 1.5 Muon Answer signal will be valid at the time of the rising edge of the associated Level 1.5 Muon Done signal, so it will also be valid 50 nanoseconds before the Trigger Framework sampling time. When the Trigger Framework begins a Level 1.5 decision cycle, any Done Signals that it finds high will be considered to be valid Done Signals which are indicating the presence of valid information on their Answer line(s). During a L1.5 cycle, once a given Done signal goes high it must remain high until the end of the L1.5 cycle. LEVEL 1.5 MUON TRIGGER CABLES The 16 Answer Signals and the 16 accompanying Done Signals are carried on two separate 34 Conductor Twisted-Flat Cables. All signals on these cables are Positive True logic. All levels are differential ECL carried over the 110 Ohm twisted pair transmission lines. At the Receiving End (Level 1 Trigger Framework) the cables must be terminated with a 110 Ohm resistor across each differential pair of lines. The Sending End (Level 1.5 Muon Trigger) must provide the pull down current (typically either 510 Ohm resistors to -5.2V or else 56 Ohm pull down resistors to -2V). An ODD numbered pin is the non-inverted line of a signal with the next higher EVEN numbered pin the inverted line of the same signal. Pin on cable Function # ----------------------------------------------------------------------------- 1 brown Non-inverted Level 1.5 Muon Answer #0 2 tan Inverted Level 1.5 Muon Answer #0 3 red Non-inverted Level 1.5 Muon Answer #1 4 tan Inverted Level 1.5 Muon Answer #1 5 orange Non-inverted Level 1.5 Muon Answer #2 6 tan Inverted Level 1.5 Muon Answer #2 7 yellow Non-inverted Level 1.5 Muon Answer #3 8 tan Inverted Level 1.5 Muon Answer #3 9 green Non-inverted Level 1.5 Muon Answer #4 10 tan Inverted Level 1.5 Muon Answer #4 11 blue Non-inverted Level 1.5 Muon Answer #5 12 tan Inverted Level 1.5 Muon Answer #5 13 violet Non-inverted Level 1.5 Muon Answer #6 14 tan Inverted Level 1.5 Muon Answer #6 15 grey Non-inverted Level 1.5 Muon Answer #7 16 tan Inverted Level 1.5 Muon Answer #7 17 white Non-inverted Level 1.5 Muon Answer #8 18 tan Inverted Level 1.5 Muon Answer #8 19 black Non-inverted Level 1.5 Muon Answer #9 20 tan Inverted Level 1.5 Muon Answer #9 21 brown Non-inverted Level 1.5 Muon Answer #10 22 tan Inverted Level 1.5 Muon Answer #10 23 red Non-inverted Level 1.5 Muon Answer #11 24 tan Inverted Level 1.5 Muon Answer #11 25 orange Non-inverted Level 1.5 Muon Answer #12 26 tan Inverted Level 1.5 Muon Answer #12 27 yellow Non-inverted Level 1.5 Muon Answer #13 28 tan Inverted Level 1.5 Muon Answer #13 29 green Non-inverted Level 1.5 Muon Answer #14 30 tan Inverted Level 1.5 Muon Answer #14 31 blue Non-inverted Level 1.5 Muon Answer #15 32 tan Inverted Level 1.5 Muon Answer #15 33 violet Grounded at Sending End 34 tan Grounded at Sending End Pin on cable Function # ----------------------------------------------------------------------------- 1 brown Non-inverted Level 1.5 Muon Done for Answer #0 2 tan Inverted Level 1.5 Muon Done for Answer #0 3 red Non-inverted Level 1.5 Muon Done for Answer #1 4 tan Inverted Level 1.5 Muon Done for Answer #1 5 orange Non-inverted Level 1.5 Muon Done for Answer #2 6 tan Inverted Level 1.5 Muon Done for Answer #2 7 yellow Non-inverted Level 1.5 Muon Done for Answer #3 8 tan Inverted Level 1.5 Muon Done for Answer #3 9 green Non-inverted Level 1.5 Muon Done for Answer #4 10 tan Inverted Level 1.5 Muon Done for Answer #4 11 blue Non-inverted Level 1.5 Muon Done for Answer #5 12 tan Inverted Level 1.5 Muon Done for Answer #5 13 violet Non-inverted Level 1.5 Muon Done for Answer #6 14 tan Inverted Level 1.5 Muon Done for Answer #6 15 grey Non-inverted Level 1.5 Muon Done for Answer #7 16 tan Inverted Level 1.5 Muon Done for Answer #7 17 white Non-inverted Level 1.5 Muon Done for Answer #8 18 tan Inverted Level 1.5 Muon Done for Answer #8 19 black Non-inverted Level 1.5 Muon Done for Answer #9 20 tan Inverted Level 1.5 Muon Done for Answer #9 21 brown Non-inverted Level 1.5 Muon Done for Answer #10 22 tan Inverted Level 1.5 Muon Done for Answer #10 23 red Non-inverted Level 1.5 Muon Done for Answer #11 24 tan Inverted Level 1.5 Muon Done for Answer #11 25 orange Non-inverted Level 1.5 Muon Done for Answer #12 26 tan Inverted Level 1.5 Muon Done for Answer #12 27 yellow Non-inverted Level 1.5 Muon Done for Answer #13 28 tan Inverted Level 1.5 Muon Done for Answer #13 29 green Non-inverted Level 1.5 Muon Done for Answer #14 30 tan Inverted Level 1.5 Muon Done for Answer #14 31 blue Non-inverted Level 1.5 Muon Done for Answer #15 32 tan Inverted Level 1.5 Muon Done for Answer #15 33 violet Grounded at Sending End 34 tan Grounded at Sending End