Presentation on theme: "RPC Electronics Overall system diagram –At detector –Inside racks Current status –Discriminator board –TDC board –Remaining task."— Presentation transcript:
RPC Electronics Overall system diagram –At detector –Inside racks Current status –Discriminator board –TDC board –Remaining task
Altera Cyclone II FPGA Altera Cyclone II FPGA 20X4rows connectors 32 channel (Timing bin = 106ns/64) Data 32 bits L1 trigger RPC(HBD) crate/BUS structure 6Ux160 mm VME size TDCTDC TDCTDC Output To L1 Clock fanout L1 primitives L1 GTM Slow Control 8/6 TDCs TDC Output To DCM Disc. 16 channels cable input 16 channels cable input 16 channels cable input 16 channels cable 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 data L1 data Cable adapter board
RPC disc 32 ch 3M PL Or pl RPC TDC 64 ch Half octant Module edge Adapter Board Adapter Board 2-3 m cable ?8 meters cable ? 2-3 m cable?8 meter cable ? 3M (Gray) M (Black) RB 3M (Gray) M N3432-L302RB 3M (Black) D89140-???? Signal Cable : 40 conductors twist flat ribbon cable 3M (gray) M M 1700/40 Twisted Pair, Flat Cable,.050" 28 AWG Stranded Fire rating VW-1 16 short RG174 cables Signal Cable
RPC discriminator power Molex circuits 94-V0 Molex UL94 V0 Molex gauge wire Max. current 5A. 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. fuse
Molex Molex mm (.165") Pitch Mini-Fit BMI Plug series Dual Row With Panel Mount Ears 4.20mm (.165") Pitch Mini-Fit Jr. Receptacle 5557 series Dual Row – 14(16) position (94V-0) (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 gauge wires, 9A max 100 cycles mating Molex gauge wires, 9A max 100 cycles mating
FEM crate ERNI mm HM standard 9(8)A at 20 0 c per contact 94V-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 module design in progress Clock Master 0.9V 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 5V(4V) Digital GND HBD crate power connection (back view) with Bus Bar Clock fanout cable Meritec (-048) UL 94V-0 Bus Bar
Channel count etc… (one side) Station1a+b23total Channel Channel per FEM (TDC) FEM (TDC) Disc Board L1 trigger Fibers FEM/ fibers646 Support board/crate 343 FEM/crate Crates44412 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. 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
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 TDC 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