1. RPC Electronics Overall system diagram Current status At detector
Inside racks
Current status
Discriminator board
TDC board
Remaining task

2. Output Output To To L1 DCM On chamber Disc. 32 channel 20X4rows
TDC
Disc.
16 channels
cable input
Altera
Cyclone II
FPGA
32 channel
16 channels
cable input
Serial
download
20X4rows
connectors
32 bits
L1 trigger
(Timing bin =
106ns/64)
Data
Disc.
16 channels
cable input
Altera
Cyclone II
FPGA
32 channel
16 channels
cable input
Serial
download
RPC(HBD) crate/BUS structure 6Ux160 mm VME size T D C T D C
Output
To L1
Output To
DCM
Clock
fanout
Clock Master
8/6 TDCs
Control
Slow
GTM
L1 primitives
DCM 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 RPC TDC 64 ch RPC disc 32 ch
Half octant
Module edge
3M (Gray)
RPC
TDC 64 ch
RPC
disc 32 ch
3M (Gray)
Adapter
Board
16 short
RG174 cables
2-3 m cable ?
8 meters cable ? 3M
N3432-L302RB 3M PL Or pl 3M
3M (gray)
2-3 m cable?
8 meter cable ?
Adapter
Board
3M (Black)
D89140-????
3M (Black) RB
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
4 circuits
94-V0
Molex
UL94 V0
Molex
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 (analog+digital)
The current thinking is we will combine analog and digital power at the patch
panel connector at RPC half octant edge.

6. Half octant Module edge Power Connector
LV supplies wires
Chamber end
Inside the
chamber module
Half octant
Module edge
Power Connector
~1.5cm
Panel Thickness: 1.60mm (.063") max.
Molex
Molex
4.20mm (.165") Pitch Mini-Fit Jr.™ Receptacle
5557 series Dual Row
4.20mm (.165") Pitch Mini-Fit BMI™ Plug
42475 series Dual Row With Panel Mount Ears
(16) position
(94V-0)
– 14(16) position
(94V-0)
Molex
16 gauge wires, 9A max
100 cycles mating
12(16) connectors for RPC3
Molex
16 gauge wires, 9A max
100 cycles mating

7. FEM crate VME 6U mechanical form factor All modules has fuse
ERNI
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, <1A 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.
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.

10. HBD crate power connection
(back view) with Bus Bar
Analog GND
-3.5V
+4V
-3.5V
Clock fanout cable
Meritec (-048)
UL 94V-0
Bus Bar
5V(4V)
Digital GND

12. Channel count etc… (one side)
Station
1a+b 2 3
total
Channel
3072
3848
2872
9792
Channel per FEM (TDC) 64 65
FEM (TDC) 48
190
Disc Board 96
128
380
L1 trigger Fibers 8 16 32
FEM/ fibers 6 4
Support board/crate
FEM/crate 12
Crates
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.
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

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. internal test pulse vs. TDC value
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