Note

This page is out of date. Please go to ATCAforATLAS

Introduction

Under that chairmanship of Philippe Farthouat representatives of the ATLAS sub-detectors and TDAQ are working on recommendations for crate based standards for modular electronics that may replace VMEbus on a time scale of Phase 1.

This TWiki

The purpose of this Twiki page is to facilitate the exchange of information between the members of the work group and to serve as a repository for shared information.

Comparison of standards

As proposed by Benedetto we should try to compare the existing standard on the basis of their technical and commercial merits. The table below is a start in this direction. All members of the group are kindly asked to add information to it.

* VMEbus (VME64x) VXS ATCA uTCA crates based on no standard PC based systems
Number of slots per 19 crate 21 21 14 12    
Max. power per slot     400 80    
Max. data transfer bandwidth ~50 MB/s 16 differential pairs per payload slot. Allows e.g. for two x4 PCIe ports       Many GB/s (depends on PCIe card)
Cooling (air flow) vertical vertical horizontal (vertical possible) horizontal (vertical possible)   horizontal
Space for connectors front and back front and back front and back front and back (only MTCA.4)   only back
Card dimensions (6U x 160 mm or 9U x 340 mm) x 20.3 mm (6U x 160 mm or 9U x 340 mm) x 20.3 mm 8U x 280 mm x 30.48 mm (74 or 149 mm) x 180 mm x (13, 18 or 28 mm)    
RTM dimensions     8U x 60 mm x 30.48 mm (74 or 149 mm) x 180 mm x (13, 18 or 28 mm)    
Standard published in 1997 (based on VMEbue from 1982) 2006 (based on VMEbus from 1982) 2001 2006    
System monitoring Not defined. Slaces can be monitored via the bus in a user defined way IPMI / I2C possible (but not mandatory) IPMI / I2C IPMI / I2C   IPMI possible at the PC level. Card level not defined
Redundancy Not defined Backplane supports redundant start architecture Full support at H/W level (PSUs, cooling units, shelf meneger). Redundancy at the level of blades may require special S/W Same as for ATCA   Not defined. Redundant PSUs possible
Volume of the global market claimed to be ~1 Billion USD Very small unknown unknown   Very large
Type of power supply 230 VAC in or next to crate 230 VAC in or next to crate External 230VAC to -48 VDC converter External 230VAC to -48 VDC converter or local 230 VAC   230VAC PSU in PC chassis
Hot swap of I/O cards Possible but rarely used Possible but rarely used (S/W issue) Possible (user S/W has to support it) Possible (user S/W has to support it)   Not possible
Mezzanines on main board PMC & XMC PMC & XMC AMC FMC possible   User deinfed
Used also by (CERN only) CERN accellerator controls COMPASS, BE/CO (just the mechanics) LHCb (planned) CMS LHCb (may be replaced by ATCA) CMS
Reuse of existing H/W infrastructure (crates, I/O cards) Possible Possible (new backplanes required; maybe also new PSU) not possible not possible not possible not possible
Communication protocol VMEbus VMEbus & (Infiniband, SRIO, PCIe, Eth) Infiniband, SRIO, PCIe, Eth (and user defined protocols) Infiniband, SRIO, PCIe, Eth (and user defined protocols)   PCIe (within the PC) Infiniband,ethernet,etc between PCs

-- MarkusJoos - 24-May-2012

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Topic revision: r6 - 2013-11-01 - MarkusJoos
 
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