RPC Electronics

1
RPC Electronics

• Overall system diagram
• At detector
• Inside racks
• Current status
• Discriminator board
• TDC board
• Remaining task

2
On chamber
TDC
Disc.
Altera Cyclone II FPGA
16 channels cable input
32 channel
16 channels cable input
Serial download
20X4rows connectors
32 bits L1 trigger
(Timing bin 106ns/64)
Data
Disc.
Altera Cyclone II FPGA
16 channels cable input
32 channel
16 channels cable input
Serial download

RPC(HBD) crate/BUS structure 6Ux160 mm VME size
Output To DCM
T D C
T D C
Output To L1
Clock fanout
Clock Master
8/6 TDCs
Slow Control
GTM
DCM
L1 primitives
L1
3
RPC Discriminator board
CMS RPC discriminator chip
Temporary programming jig
power
LVDS discriminator output
Signal flow
RPC TDC board
L1 data
DCM data
Cable adapter board
4
Signal Cable
Half octant Module edge
3M (Gray) 3432-5302
RPC TDC 64 ch
RPC disc 32 ch
3M (Gray) 3417-6640
Adapter Board
16 short RG174 cables
2-3 m cable ?
8 meters cable ?
3M N3432-L302RB
3M 6834-4500PL Or 8534-4500pl
3M 4640-7300
3M (gray) 3431-5302
2-3 m cable?
8 meter cable ?
Adapter Board
3M (Black) D89140-????
3M (Black) 3432-5302RB
Signal Cable 40 conductors twist flat ribbon
cable
3M 1700/40 Twisted Pair, Flat Cable, .050" 28 AWG
Stranded Fire rating VW-1
5
RPC discriminator power
Molex 43650-0412 4 circuits 94-V0
Molex 43645-0400 UL94 V0
Molex 43030-0008 20-24 gauge wire Max. current 5A.
fuse
Discriminator RPC board internally has 5 Analog,
5 Digital, 3V Digital through low drop
regulators Power connector need 6V analog, 6V
digital The board draws 0.42A total current
(analogdigital) The current thinking is we will
combine analog and digital power at the patch
panel connector at RPC half octant
edge.
6
Chamber end
LV supplies wires
Inside the chamber module
1.5cm
Half octant Module edge Power Connector
Panel Thickness 1.60mm (.063") max.
Molex 39012105
Molex 0015060106
4.20mm (.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
0015-06-0146 14(16) position (94V-0)
39012145 14(16) position (94V-0)
Molex 46083-3212 16 gauge wires, 9A max 100
cycles mating
12(16) connectors for RPC3
Molex 46134-3212 16 gauge wires, 9A max 100
cycles mating
7
FEM crate
ERNI 114402 2mm HM standard 9(8)A at 200c per
contact 94V-0
VME 6U mechanical form factor
All modules has fuse
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, lt1A a full speed L1 trigger output
module design in progress Clock Master 0.9V at
5.5V (one per rack) 1.1A at 4V
8
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

9
DC power distribution

• After half octant module, all discriminator board
  power(2 wires per module) should be wire to rack.
• 166 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.

10
HBD crate power connection (back view) with Bus
Bar
Analog GND
4V
-3.5V
-3.5V
Clock fanout cable Meritec 980319-024(-048) UL
94V-0
Bus Bar
5V(4V)
Digital GND
11
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12
Channel count etc (one side)
Station 1ab 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.

13
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.
• Dont 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

14
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.

15
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.

16
TDC module internal test pulse vs. TDC value
dead region
TDC
TDC
Channel 17
Channel 18
One beam crossing
Internal test pulse step
Internal test pulse step
TDC internal test pulse is generated with both
edge of the 320MHz clock (i.e. 64 steps, 1.6ns
per step)
17
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.

18
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