RPC Electronics

• Overall system diagram– At detector – Inside racks

• Current status– Discriminator board– TDC board– Remaining task

AlteraCyclone

IIFPGA

AlteraCyclone

IIFPGA

20X4rowsconnectors

32 channel

32 channel

(Timing bin =106ns/64)

Data

32 bitsL1 trigger

RPC(HBD) crate/BUS structure 6Ux160 mm VME size

TDC

TDC

OutputTo L1

Clockfanout

L1 primitives L1

GT

M Slo

wC

on

tro

l

8/6 TDCs

TDC

Output To

DCM

DC

M

Disc.

Disc.

16 channelscable input

16 channelscable input

16 channelscable input

16 channelscable input

On chamber

Clock Master

Serial download

Serial download

Signal flow

Temporary programming jig

power

LVDS discriminator output

CMS RPC discriminator chip

RPC Discriminator board

RPC TDC board

DCM dataL1 data

Cable adapter board

RPCdisc32ch

3M6834-4500PL

Or8534-4500pl

RPCTDC64ch

Half octant Module edge

AdapterBoard

AdapterBoard

2-3 m cable ? 8 meters cable ?

2-3 m cable? 8 meter cable ?

3M (Gray)3432-5302

3M (Black)3432-

5302RB

3M (Gray)3417-6640

3MN3432-L302RB

3M (Black)D89140-????

Signal Cable : 40 conductors twist flat ribbon cable

3M (gray)3431-5302

3M4640-7300

3M 1700/40 Twisted Pair, Flat Cable, .050" 28 AWG StrandedFire rating VW-1

16 short RG174 cables

Signal Cable

RPC discriminator power

Molex 43650-04124 circuits

94-V0 Molex 43645-0400UL94 V0

Molex 43030-000820-24 gauge wireMax. current 5A.

Discriminator RPC board internally has +5 Analog, +5 Digital, +3V Digitalthrough low drop regulators

Power connector need +6V analog, +6V digitalThe board draws 0.42A total current (analog+digital)The current thinking is we will combine analog and digital power at the patch panel connector at RPC half octant edge.

fuse

Molex 39012105 Molex 00150601064.20mm (.165") Pitch Mini-Fit BMI™ Plug

42475 series Dual Row With Panel Mount Ears

4.20mm (.165") Pitch Mini-Fit Jr.™ Receptacle

5557 series Dual Row

39012145 – 14(16) position (94V-0)

0015-06-0146 14(16) position(94V-0)

~1.5cm

Inside the chamber module

Panel Thickness: 1.60mm (.063") max.

12(16) connectors for RPC3

Chamber endLV supplies wires

Half octant Module edge

Power Connector

Molex 46134-321216 gauge wires, 9A max100 cycles mating

Molex 46083-321216 gauge wires, 9A max100 cycles mating

FEM crate ERNI 114402 2mm HM standard

9(8)A at 200c per contact94V-0

TDC 0.6A when power up ~1A at full speed 4V (3.3V and 1.2 internally)

Clock fanout module ~.8A

Xmit module ~.4A after power up, <1A a full speed

L1 trigger output moduledesign in progress

Clock Master0.9V at 5.5V (one per rack)1.1A at 4V

VME 6U mechanical form factor

All modules has fuse

High Voltage Power supply

• We use CAEN SY1527LC crate supply– 8 U size– RPC1N and 1S probably can just share one

power supply– how about station 2, 3

• Do we need a patch (fanout) panel

DC power distribution

• After half octant module, all discriminator board power(2 wires per module) should be wire to rack.– 16*6 RPC discriminator for station 3– DC power fanout at din rail mounted fuse block at the

FEM rack (~1A fuse)– Do not share power supply between station.– Use Low noise converter pack (QPAC)

• For the FEM crate power– do not share power between crates.

Analog GND

+4V-3.5V -3.5V

5V(4V)

Digital GND

HBD crate power connection(back view) with Bus Bar

Clock fanout cableMeritec 980319-024(-048)UL 94V-0

Bus Bar

Channel count etc… (one side)

Station 1a+b 2 3 total

Channel 3072 3848 2872 9792

Channel per FEM (TDC)

64 64 64 65

FEM (TDC) 48 64 48 190

Disc Board 96 128 96 380

L1 trigger Fibers 8 16 8 32

FEM/ fibers 6 4 6

Support board/crate 3 4 3

FEM/crate 12 16 12

Crates 4 4 4 12

The crate size is like 6U VME crate.I would like to limit the length discriminator cable to 10 meters.

(to be tested about jitters)

The RPC2, 3, we will need to find the crate space near the detector.Crate need to be recess in the rack. Cable routing space needed in front of the crate.

What half octant station 2,3 need

• 6 discriminator boards, 3 TDC modules for station 3 half octant, 8 discriminator boards, 4 TDC modules for station 2 half octant.

• Don’t know we should have one crate or 2 crates for the coming run.– Timing issues– Some thing we need to thinks about…

• We only need one DCM board with maximum 2 FE3 daughter card.– One more granule, we also need one GTM.

• We also need 2 RPC L1 trigger board • The slow control will done with Ethernet (packet transfer).

– Backup solution will be slow serial download cable– I assume this will become UC/Nevis responsibility

Electronics status

• We have received prototype discriminator board a while ago, one assembled.

• The two assembled TDC modules was received about one week ago.

• We have received 100 cable adapter board last Friday. We assembled one example.

Electronics test done so far

• Check out discriminator serial download strings– set discriminator threshold DAC– Fire test pulse and see the output LVDS signal

• Couple directly into the input amplify

• TDC module– Verify serial download– read data back in offline mode

• Through the clock master module– Fire TDC module internal test pulse, compare TDC

value vs. test pulse steps• More detail test works need to be done to

characterize the system.

TDC module internal test pulse vs. TDC value

Internal test pulse step Internal test pulse step

TD

C TD

C

Channel 17

Channel 18

dead region

One beam crossing

TDC internal test pulse is generated with both edge of the 320MHz clock(i.e. 64 steps, ~1.6ns per step)

Clockmaster software

• Clock master module interface– use Motorola Coldfire 5282 evaluation board

• (ethernet) slowdown load

– Interface to the GTM to distribute clocks, L1 trigger and test pulse

• Alex has able to build uCLinux for the 5282 evaluation board– we will be working together to build the

software to control the FEE system.

What happen next

• More testing

• Built L1 trigger board 4 months?

• Problem– There is only one test stand, like to build more

• Production issue on the backplane, crate, clock master module, xmit, clock fanout etc

• This will become problem to has test stand in BNL and Boulder

– When will the production start