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HBD FEM

HBD FEM. the block diagram preamp – FEM cable Status Stuffs need to be decided…. Global Organization. 32 channels per FEM 2 VME-style 6U crates for the detector Custom dataway (backplane) 21 slots per crate, 1U=1.75 inch 20 FEM per crate 20*32*2= 1280 channels

jonah-hill
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HBD FEM

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  1. HBD FEM • the block diagram • preamp – FEM cable • Status • Stuffs need to be decided….

  2. Global Organization • 32 channels per FEM • 2 VME-style 6U crates for the detector • Custom dataway (backplane) • 21 slots per crate, 1U=1.75 inch • 20 FEM per crate • 20*32*2= 1280 channels • FEM cable plug in the front of FEM • Trigger primitives output from the back • 1 local trigger crate(?)

  3. System Block Diagram FEM We will use half of the ADC range (i.e. +  +, -  -) Assume 8 bits for 1 e-, 8 e- will reach full scale. Output To DCM 60MHz (5 FEMs per fiber) preamp 8 channels 65 MHZ 12 bits Serial ADC (6X beam clock) differential receiver 720 MHz Serial data ALTERA 10K30 FPGA (L1 delay buffer, data format, generating L1 trigger output etc.) 32 channels Signals ( 12 samples ADC data per channel per L1 trigger) 4 bits per Channel (1.28 Gbits)

  4. Cable (connector) choice 3M shield twist pair cable 1785/34 (17 pair  16 signal + grounds) connector 3431 size = 62.6mm + 9.4mm(ejector) 80 signals => 36 cm 3M MDR (Mini D Ribbon) cables Need to have custom build 50 pins cable example 14150-ezbb-xxx-0lc connector 40 position 10226-1210 VE 47.1mm for 16 pairs 235.5 mm for 80pairs. 25mm for power and test pulse. Detector has 8 panels Readout both side of the panel Panel size 23x26 cm

  5. (possible) cable pinout Need to be revised. 3M only have (20 pairs and 6 drain) cable.. 16 differential shielded twisted pairs (100 ohms). Overall shield is connected to the chassis Pin 30 pair 8+ Pin 10 pair 8- Pin 29 (pair 8+7) drain Pin 9 pair 7+ Pin 28 pair 7- Pin 8 pair 6+ Pin 27 pair 6- Pin 7 (pair 6+5) drain Pin 26 pair 5+ Pin 6 pair 5- Pin 25 pair 4+ Pin 5 pair 4- Pin 24 (pair 4+3) drain Pin 4 pair 3+ Pin 23 pair 3- Pin 3 pair 2+ Pin 22 pair 2- Pin 2 (pair 2+1) drain Pin 21 pair 1+ Pin 1 pair 1- Pin 40 pair 16+ Pin 20 pair 16- Pin 39 (pair 16+15) drain Pin 19 pair 15+ Pin 38 pair 15- Pin 18 pair 14+ Pin 37 pair 14- Pin 17 (pair 14+13) drain Pin 36 pair 13+ Pin 16 pair 13- Pin 35 pair 12+ Pin 15 pair 12- Pin 34 (pair 12+11) drain Pin 14 pair 11+ Pin 33 pair 11- Pin 13 pair 10+ Pin 32 pair 10- Pin 12 (pair 10+9) drain Pin 31 pair 9+ Pin 11 pair 9-

  6. Status • Major Block of the FPGA code is done • (serial download, ADC data receiving, data alignment, trigger output generators (16 threshold per channel) etc.) • Work out internal serial download protocol • Work out clock distribution/generators • 4X beam clock from GTM • 4X beam clock go to all FEM • 1X, 6X, 8X beam clocks generated inside the FEM • We ask 3M to work out budgetary code for the detector ->FEM cable • 2 piece prototype, 100 piece production • Working on backplane connectors • High speed signal pass through connectors. • Working on the ARCNET replacement chipset • For slow download • Start to look at new DCM issues • The FEM only can be readout through new protocol/optical chipsets • Proceed with prototype component purchasing and layout before end of the year

  7. Issue need to be addressed • Cable choice • Channel count • How many bits per channel is really needed in L1 • What L1 trigger board suppose to do

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