Presentation on theme: "HBD FEM the block diagram preamp – FEM cable Status Stuffs need to be decided…."— Presentation transcript:
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 –FEM cable plug in the front of FEM –Trigger primitives output from the back 1 local trigger crate(?)
differential receiver FEM 8 channels 65 MHZ 12 bits Serial ADC (6X beam clock) 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) preamp Output To DCM 60MHz (5 FEMs per fiber) 4 bits per Channel (1.28 Gbits) System Block Diagram 720 MHz Serial data We will use half of the ADC range (i.e. + +, - -) Assume 8 bits for 1 e -, 8 e - will reach full scale.
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
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
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