Changes between Version 51 and Version 52 of CommonATCA


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Timestamp:
May 21, 2019, 3:50:46 PM (5 months ago)
Author:
tcpaiva
Comment:

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  • CommonATCA

    v51 v52  
    8282
    8383[[ApolloHistory]] -- older stuff
    84 
    85 
    86 === Possible Mezz-Blade Connectors
    87 
    88 * Samtec ET60T/ET60S (60A power, up to 24 low-speed signals)
    89 * Samtec ERF8/ERM8 (edge-rate diff pair up to 58Gbps)
    90 
    91 Meetings:
    92 
    93 * https://indico.cern.ch/event/738681/ (2018-06-20)
    94 
    95 '''2018-05-31'''
    96 
    97 Thinking about a common blade for ATLAS L0MDT and CMS IT-DTC. \\
    98 Issues with the current ATLAS design:
    99 
    100 * FMC stacking height at 8.5mm is too high
    101 
    102 Issues with the current CMS design (Cornell one):
    103 
    104 * Really don't like the interposer concept with metal plates, springs etc
    105 * Prefer stand-alone mezzanine card operation
    106 
    107 Plus, there are two different blade designs for no obvious reason.
    108 
    109 First, looking at low stack height connectors, but not Z-ray. 
    110 (See Samtec [http://suddendocs.samtec.com/literature/samtec-high-speed-b2b-design-guide.pdf guide])
    111 Samtec families with low stack heights:
    112 
    113 || '''Family''' || '''Series''' || '''Stack Height''' || '''Notes''' ||
    114 || Sea-Ray || [https://www.samtec.com/products/lpam LPAM]/[https://www.samtec.com/products/lpaf LPAF] || 4mm ||
    115 || Edge Rate || [https://www.samtec.com/products/edm6 EDM6]/[https://www.samtec.com/products/edf6 EDF6] || 5mm ||
    116 || Q Series || [https://www.samtec.com/products/qth QTH]/[https://www.samtec.com/products/qsh QSH] || 5mm? || 28 Gbps+, pairs, power ||
    117 || || [https://www.samtec.com/products/qte QTE]/[https://www.samtec.com/products/qse QSE] || 5mm || 25A GND plane ||
    118 || Ultra-Micro || [https://www.samtec.com/products/edm6 EDM6]/[https://www.samtec.com/products/edf6 EDF6] || 5mm ||
    119 || || [https://www.samtec.com/products/lss LSS]/[https://www.samtec.com/products/lsem LSEM]/[https://www.samtec.com/products/lshm LSHM] || 5mm ||
    120 || || [https://www.samtec.com/products/st4 ST4]/[https://www.samtec.com/products/ss4 SSR] || 4mm ||
    121 
    122 Below is a figure with dimensions excerpted from the ATCA standard.
    123 
    124 || [[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. ||
    125 
    126 Next, thinking about the logic.  Is it really that hard to make a common blade?  Here are some thoughts:
    127 
    128 * Build a blade to accommodate 3 mezzanine cards
    129 * Plan for only "low speed" mezz-to-mezz communications \\
    130   (SelectIO or < 10Gbps SERDES)
    131 * Mezzanine cards would have the optics on board along with DC/DC converters and regulators
    132 * Split the CMS IT-DTC into 3 parts
    133 * Eliminate the "blade FPGA" from the ATLAS design and designate one mezz card as "master" \\
    134   (this could be a different design).
    135 
    136 '''ATLAS requirements'''
    137 
    138 * Sector logic
    139