1

Preshower Front-End Electronics Status

LHCb group, LPC Clermont

OUTLINEPRODUCTION TESTS

PRESERIE I

PGA ISSUES: ~SOLVED

PRESERIE II (…)

CALORIMETER MEETING – 13th MARCH 2007

2

FROM BOARD PRODUCTION TO VALIDATION

PRODUCTION:and PGA JTAG programming @Hitachi, Orléans

JTAG TEST: 1/2Most of the board I/Os data conversion, TTL levels, internal buses, pga pins

TEST BENCH:All I/Os and PGA Algorithms on individual boards w/ external injection ( numeric & analogic data )

FULL CRATE TEST:Individual test within full crate (14 boards)Full crate DAQ test w/ CROC FIFO

AGEING TEST:

Hita

chi

LP

CH

itach

iL

PC

2

12

3

prototypeboards

preserieboards

3

TEST BENCH PROCESSES MANAGING

CAT Process ManagerList of processes to be executed

I2C, intraconnectivity, algorithms, phasers, I/Os

Output parsed to HTMLOrganize data / web browsable

See also Monteil @ calorimeter comissioning / 14th February

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STATUS OF TEST BENCH / PRESERIE I

Index summary @ http://clrwww.in2p3.fr/lhcb/feb/prod

PrototypeBoards (2/2)

Preserie I( 7/7 )

Preserie II( 5*/8 )

TRIG-PGA: Running butJTAG ‘burnt’ (2/7)Hitachi JTAG Tests ?

RJ45 connectordamaged ( 1/119)

Soldering, ADC (1/28)clock not connected

Delay chipdamaged (1/21)

None of those observed in Preserie II

Problems spottedin Preserie I

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GENERAL PGA ISSUES / ALL BOARDS

TRIG PGA:

SEQ PGA:

Bit Flip faillures monitored for each boardThreshold: 17-21 %, consistent w/ prototypes boards( lhcb-2007-005 note )

40 MHz

No Rd_Cmd on L0: SEQ ‘knocked’ down by ‘L0 snap’from CROC @ PRS-FEB power-up

L0 snap

SOLVED:A particular sequence of RST

systematically allows SEQ recovery( n_rst followed by nfe_rst )

6

DAQ ISSUES / ALL BOARDS

SEQ PGA:

DAQ: data of FE0 lost @ serialisertiming issues. SOLVED with new SEQ version

Not seen before: strong dependency w/ board, crate, re-programming, …

All in all, minor issues compared to Preserie II5/8 boards failed @ production level …

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PRESERIE II: DAY 1

@ PRODUCTION: SEQ/GLUE PGA can not be programmed symptom: ‘TDO stucked to 1’ / confirmed w/ scope

(-)75 (-)76 (-)77 (-)78 (-)80

2.8

Serial:

Thickness:(mm)

2.82.4 2.4 2.4

TRIG

GLUE

SEQ

PCB too large, not produced @ Hitachi

(-)79 (-)81(-)82

= OK

= KO

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PRESERIE II: 1 WEEK LATER

(-)75 (-)76 (-)77 (-)78 (-)80Serial:

TRIG

GLUE

SEQ

SEQchanged

OK @ LPC !‘push’ on

SEQ

KOJTAG TEST

VALID VALIDKOJTAG TEST

cut PCB

VALID VALIDVALID

(-)79 (-)81 (-)82

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SUMMARY AND OUTLOOK

•Heavy production systematic in Preserie II (due to PCB thickness ?) Problem setting responsibilities:Hitachi PGAs are deficientsLPC systematic @ Hitachi production chain

Programming of PGA foreseen / prior implantation on boards

•12+2 boards validated: A full Preshower crate can be equipped

•Minor issues & PGA tuning ongoing

Full Serie: Start of production expected ~March / 6 weeks duration Delivery each week of a batch of 16 boards / Qualification within ~ days feasible