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Strip Pilot § Communication link between ladder and counting house § Three optical fibers Strip Pilot § Communication link between ladder and counting house § Three optical fibers – Send serialized data – Receive control data – Receive beam clock § Try to put no brains on the board § Goal – Board to be used for barrel outer layers and endcap – If possible, use board design at both IR and counting house Data from bus 16 bit Control/clock bus 16 bit June 2004 Serializer De-serializer Craig Ogilvie Data out Control clock 1

Strip Requirements (TVC March 04) § Two readout cards (ROC) per sensor § § Strip Requirements (TVC March 04) § Two readout cards (ROC) per sensor § § – Each ROC has 6 SVX 4 + FPGA / ASIC – 8 ROCs per ladder – 48 svx 4 per ladder Volume per SVX 4 – Each hit = 16 bit word – 1 header – Total words/svx 4 = 1+(num hits) = 1+(occ*128) Volume per ladder – Total words/ladder = 48+(occ*6144) Time = (48+(occ*6144))/40 MHz – < 40 microsec if occ < 25% Serialize each 16 bit word at 40 MHz June 2004 Craig Ogilvie 2

Deserialize Data from bus 16 bit Control/clock bus 16 bit Serializer De-serializer Data out Deserialize Data from bus 16 bit Control/clock bus 16 bit Serializer De-serializer Data out Control/clock in § Control bus on ladder is 15 bits wide – Serialize control bits § Use “same” board in counting house – Clock fiber different Counting house IR 16 bit June 2004 Serializer De-serializer Craig Ogilvie 16 bit 3

Options for Serializer/Deserializer § GOL – Only serializes § TLK 1501 (Texas Instrument) – Options for Serializer/Deserializer § GOL – Only serializes § TLK 1501 (Texas Instrument) – Serializes/deserializes 16 bits @ 30 -60 MHz » 1. 2 Gbps – TLK 2501 serializes @ 125 MHz => 2. 5 Gbps – 8 bit /10 bit coding – Radiation tolerance? § OASE (Heidelberg/Mannheim) – Serializes/deserializes 10 bits @ 250 MHz » 2. 5 Gbps – On-chip laser diode (VCSEL) – Not yet available June 2004 Craig Ogilvie 4

Endcap Requirements § Each endcap has 4 z-stations and 24 sectors/station § § § Endcap Requirements § Each endcap has 4 z-stations and 24 sectors/station § § § June 2004 – 96 pilot cards or output fibers – ~6 k channels / fiber PHX hit, minimum of 16 bits Total words / fiber = (num hits) = occ*6 k Timing for LVL 1, data off detector in ~0. 5 microsec Try tlk 2501 at max 125 MHz Time = (occ*6 k)/125 MHz – < 0. 5 microsec if occ < 1% Craig Ogilvie 5

Next Steps § Iterate with Vince, Chi, John H. on requirements, skeleton of design Next Steps § Iterate with Vince, Chi, John H. on requirements, skeleton of design – Work closely with ORNL § Buy TLK 1501/TLK 2501 samples ($16 / piece) – Test on bench » Serialize/deserialize loop – Test in radiation environment » IR, elsewhere? § Optical components – Depends on location in IR – If on ladder, CMS optical package used by pixel » ST Microelectronics – If on nosecone, many options June 2004 Craig Ogilvie 6