Changes between Version 3 and Version 4 of CommonATCA


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Timestamp:
May 31, 2018, 4:20:06 PM (19 months ago)
Author:
hazen
Comment:

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  • CommonATCA

    v3 v4  
    11'''2018-05-31'''
    22
    3 Thinking about a common blade for ATLAS L0MDT and CMS IT-DTC.
     3Thinking about a common blade for ATLAS L0MDT and CMS IT-DTC. \\
     4Issues with the current ATLAS design:
     5
     6* FMC stacking height at 8.5mm is too high
     7
     8Issues with the current CMS design (Cornell one):
     9
     10* Really don't like the interposer concept with metal plates, springs etc
     11* Prefer stand-alone mezzanine card operation
     12
     13Plus, there are two different blade designs for no obvious reason.
    414
    515First, looking at low stack height connectors, but not Z-ray. 
     
    1828Below is a figure with dimensions excerpted from the ATCA standard.
    1929
    20 || [http://gauss.bu.edu/svn/atlas-phase-2-muon-upgrade/Meetings/2018-05-31_EDF/figs/stack_heights.png  [[Image(http://gauss.bu.edu/svn/atlas-phase-2-muon-upgrade/Meetings/2018-05-31_EDF/figs/stack_heights.png)]]] || Seems as if we can find a 4mm or 5mm solution.  \\ This gives us about 15.7mm above a mezzanine board for components. ||
     30|| [[Image(http://gauss.bu.edu/svn/atlas-phase-2-muon-upgrade/Meetings/2018-05-31_EDF/figs/stack_heights.png)]] || Seems as if we can find a 4mm or 5mm solution.  \\ This gives us about 15.7mm above a mezzanine board for components. ||
    2131
     32Next, thinking about the logic.  Is it really that hard to make a common blade?  Here are some thoughts:
     33
     34* Build a blade to accommodate 3 mezzanine cards
     35* Plan for only "low speed" mezz-to-mezz communications \\
     36  (SelectIO or < 10Gbps SERDES)
     37* Mezzanine cards would have the optics on board along with DC/DC converters and regulators
     38* Split the CMS IT-DTC into 3 parts
     39* Eliminate the "blade FPGA" from the ATLAS design and designate one mezz card as "master" \\
     40  (this could be a different design).
     41
     42