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[][]\OT1/ptm/m/n/9 This work was sup-ported by the Di-vi-sion of High En-ergy
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\OT1/ptm/m/n/9 Physics of the U.S. De-part-ment of En-ergy un-der Con-tract No.

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\OT1/ptm/m/n/10 Par-ti-cle Trig-ger Sys-tem of the [] De-tec-tor at PEP-II.
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\OT1/ptm/m/n/10 It pro-vides trig-ger de-ci-sions for charged par-ti-cles with
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\OT1/ptm/m/n/10 a trans-verse mo-men-tum, [], greater than a con-fig-urable
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\OT1/ptm/m/n/10 trig-ger de-ci-sions are made by the Global Trig-ger Logic
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[]\OT1/ptm/m/n/10 Excellent de-tec-tion ef-fi-ciency for physics pro-cesses is
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[]\OT1/ptm/m/n/10 The prin-ci-pal com-po-nents on each board are eight
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\OT1/ptm/m/n/10 al-go-rith-mic pro-ces-sor en-gines each with pro-grammable
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\OT1/ptm/m/n/10 has a ded-i-cated bank of six mem-o-ries that com-prise the
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\OT1/ptm/m/n/10 boards to op-er-ate in-de-pen-dently of the trig-ger elec-tron-
ics
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\OT1/ptm/m/n/10 through the sys-tem with the aim to mon-i-tor the sys-tem
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\OT1/ptm/m/n/10 fur-ther up-stream, in or-der to mon-i-tor the per-for-mance of

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\OT1/ptm/m/n/10 par-tic-u-larly use-ful dur-ing the de-bug-ging and func-tion-a
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\OT1/ptm/m/n/10 Fast-Control unit and a Board-Operation-Controller. The
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\OT1/ptm/m/n/10 con-trol/configuration as well as data I/O. It serves as a
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[]\OT1/ptm/m/n/10 All ca-bling is han-dled by a small (6U) back-of-crate
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[]\OT1/ptm/m/n/10 The de-sign of the trig-ger ar-chi-tec-ture and se-lec-tion
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\OT1/ptm/m/n/10 al-go-rithms is based on ex-ten-sive sim-u-la-tion stud-ies of
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\OT1/ptm/m/n/10 This model con-sists of 20,000 lines of off-line code and
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\OT1/ptm/m/n/10 de-scribes var-i-ous po-ten-tial hardware-implementable trig-ge
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\OT1/ptm/m/n/10 eval-u-a-tion of the trans-verse mo-men-tum cri-te-rion is then

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[][] 
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\OT1/ptm/m/n/10 board. Each area is pro-cessed sep-a-rately by one en-gine
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[]\OT1/ptm/m/n/10 The de-vel-op-ment and test of the board de-sign and
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\OT1/ptm/m/n/10 Carlo sim-u-lated physics events as well as sim-u-lated
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\OT1/ptm/m/n/10 back-grounds and that the [] Dis-crim-i-na-tor Mod-ules are
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\OT1/ptm/m/n/10 to com-pro-mise the ef-fi-ciency for $\OML/cmm/m/it/10 B[]$ \OT
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[] \OT1/ptm/m/n/10 dis-crim-i-na-tion al-go-rithm must pro-vide a sharp turn-on

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[]\OT1/ptm/m/n/10 The de-bug-ging of the al-go-rithm soft-ware and look-up
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[]\OT1/ptm/m/n/10 Since the al-go-rithm had been tested suc-cess-fully and
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\OT1/ptm/m/n/10 thor-oughly, the pro-to-type test it-self con-cen-trates on the

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\OT1/ptm/m/n/10 the play/record mem-o-ries and look-up ta-bles, the tim-ing
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\OT1/ptm/m/n/10 us-ing $\OT1/cmr/m/n/10 10[]$ \OT1/ptm/m/n/10 gen-er-ated physi
cs events, each rep-re-sented as
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\OT1/ptm/m/n/10 a time his-tory. The test showed bit-by-bit spa-tial and
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\OT1/ptm/m/n/10 Par-ti-cle Trig-ger Sys-tem has been suc-cess-fully de-signed,
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\OT1/ptm/m/n/10 trig-ger sys-tem have shown that the [] dis-crim-i-na-tion of
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\OT1/ptm/m/n/10 makes heavy use of the FPGA tech-nol-ogy in con-nec-tion
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\OT1/ptm/m/n/10 with user-configurable look-up ta-bles. The dis-crim-i-na-tor
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\OT1/ptm/m/n/10 thresh-old is de-scribed in the look-up ta-bles as en-velopes
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\OT1/ptm/m/n/10 pro-duc-tion boards were suc-cess-fully tested show-ing that
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[][]\OT1/ptm/m/n/10 C.T. Day \OT1/ptm/m/it/10 et al.\OT1/ptm/m/n/10 , ``The [] 
Trig-ger, Read-out and
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[][]\OT1/ptm/m/n/10 A. Berenyi \OT1/ptm/m/it/10 et al.\OT1/ptm/m/n/10 , ``A Bi-
nary Linker Tracker Mod-ule
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\OT1/ptm/m/n/10 Dig-i-tizer IC for the [] Drift Cham-ber'', in these
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[][]\OT1/ptm/m/n/10 Mentor Graph-ics Corp., Syn-op-sys Corp. and Lu-cent
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