The CMS Silicon Tracker FED Crates

1
The CMS Silicon Tracker FED Crates
Costas Foudas Imperial College
What goes in the FED Crates ?
What do we do about the VME controller ?
What about the TTC fast signals ?
FMM ?
2
The Choice of VME Controller

• The FED will support VME64x (eventually)
  Therefore we need to gain experience with the
  VEM64x protocol in the near future.
• Why ? VME64x can reach up to 160 MBytes/sec
  theoretical block transfer (BLT) rate. Most
  liekly less than that but still faster than the
  old VME.
• 4 types of PCI-to-VME cards exist Wiener
  (indeed), National Instruments, SBS, Struck. To
  my knowledge only the Struck one supports VME64x
  and can do 80 MBytes/sec real rate (I measured it
  in their lab at Hamburg). They claim to be
  firmware upgradeable to 100 Mbytes/sec.
• Keep in mind that in order to evaluate this card
  you need also a VME64x slave (FED or something
  else)

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The Struck PCI-to-VME64x Bridge

• It consists of 2 modules connected via optical
  link (Fiber)
• The VME side is 6U 160 mm.
• The PCI side consists of a mother board and the
  optical card.
• Installation
• Just like the SBS
• Linux public drivers
• available.

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The PCI module

• Standard PCI mother board
• Optical driver/receiver card

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Specification
Uses a Sequencer to avoid overhead between VME
transfers
Supports 2 edge VME Block transfer (160
Mbytes/sec in theory )
Long Optical connection. Also an 20 Km option.
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6U 180 vs 9U 400 mm
Why do it like this ?
The VME master connects directly to the VME
bus.
The front panel is 9U VME and the Crate can close
7
The FED Racks I
PC
9U FED VME CRATE
9U VME

Up to 17 FEDs
9U VME
?
The VME Controller
9U VME
8
The Rack Design
Need to get one of these and start asking
questions Where does all fit ? Is there
enough cooling where we need it ? How do we
route all the cables (optical or copper)
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VME Control
PC
? PC 3 VME ? cPCI Adapters
VME Controller
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DAQ Connection
Run control
Rack 14
Rack 1
PC
PC
. . . . . . . . 14 Racks
VME
VME
VME
VME
VME
VME
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FED Fast Signals to TTS

• The FED outputs the 4 TTS signals on the P0
  connector in LVDS.
• The different FED signals can by daisy chained to
  produce a crate summary or can be send
  individually to so FMM board.
• The merged fast signals are driven to the APVE
  input and are combined with those generated by
  the APVE.

P0
LVDS Signals Ready,Busy,Warn_OVF,Out_of_Synch,
Error
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The FED Racks II
PC
9U FED VME CRATE
9U VME

Up to 17 FEDs
9U VME
?
?
The TTC dummy Card It receives the TTC signals
from P0 and send them to an FMM on their way to
APVE.
The VME Controller
9U VME
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Summary

• Get a Struck module and evaluate it but it will
  not be of use till there is a VME64x slave.
• Need a design for getting the TTC signals from
  the P0 to the FMM.
• Need to start some system design of our rack,
  the crate and the signals.