Status of DAQ

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Memory pipeline used in the frontend chips to
store the incoming data, until a first level
trigger decision is made. The trigger pulse marks
the memory cell to be read out.
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CMS DAQ Design

• Basic principle
• CMS DAQ is a number of functionally identical,
  parallel, small DAQ systems
• A 64x64 system is feasible today

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CMS DAQ Design

• Basic principle
• CMS DAQ is a number of functionally identical,
  parallel, small DAQ systems
• A 64x64 system is feasible today

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Detector readout to surface
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Data to Surface SLink64/FRL

• SLink64 From FED to FRL
• Test pattern generator in sender card
• Test pattern verification in FRL

• FRL (Frontend Readout Link)
• Multiple firmware versions
• Spy functionality
• Event generator allows testing DAQ system without
  operational FEDs

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Event BuilderAll Commodity Backbone

• Commodity Computers commidity networking
  (Myrinet/GigabitEthernet)
• Myricoms LANaiX PCI-X, multiple links,
• LANai1XP since 1 April 2003/LANai2XP available
  Oct 2003

Myricom Switches currently based on
Xbar16 Xbar32 under development First products
expected 2Q 2004
Measured bandwidth with two LANai1XP NICs serving
as PCI-X DMA engines Grand Champion 710 MB/s
per bus Intel Pluma 426 MB/s per
bus i.e. 1.4 GB/s aggregate dual bus
Grand Champion chipset by Serverworks
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GB Ethernet TCP EVB 8x8

• XDAQ 8x8 EVB using gigabit ethernet
• Each BU builds 128 evts
• Fixed fragment sizes
• For fragment size gt 4 kB
• Thru /node 100 MB/s
• ie 80 utilization
• (Specification is 200 MB/s)

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Myricom EVB 8x8

• Full XDAQ 8x8 EVB using Myricom (LanAI9)
• software overhead (e.g. EVM included)
• Each builder unit builds 128 evts
• Log-normal fragment size distribution
• At working point(16 kB)
• Thu/node 210 MB/s
• (Specification is 200 MB/s)

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Filter Farm Test Stand
Dual 2.4 GHz Xeon with 2 GB memory, 40 GB disks
and dual on-board GE. Ran empty FU application
load BU output to a max at 100 MB/s (1 FU/node),
95 MB/s (2 FU/node) HLT application (small
event sample) CPU usage tests ongoing
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Building names
Surface DAQ building
Underground Area