Changes between Initial Version and Version 1 of ApolloHistory


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Timestamp:
May 21, 2019, 3:50:38 PM (6 months ago)
Author:
tcpaiva
Comment:

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  • ApolloHistory

    v1 v1  
     1
     2
     3=== Possible Mezz-Blade Connectors
     4
     5* Samtec ET60T/ET60S (60A power, up to 24 low-speed signals)
     6* Samtec ERF8/ERM8 (edge-rate diff pair up to 58Gbps)
     7
     8Meetings:
     9
     10* https://indico.cern.ch/event/738681/ (2018-06-20)
     11
     12'''2018-05-31'''
     13
     14Thinking about a common blade for ATLAS L0MDT and CMS IT-DTC. \\
     15Issues with the current ATLAS design:
     16
     17* FMC stacking height at 8.5mm is too high
     18
     19Issues with the current CMS design (Cornell one):
     20
     21* Really don't like the interposer concept with metal plates, springs etc
     22* Prefer stand-alone mezzanine card operation
     23
     24Plus, there are two different blade designs for no obvious reason.
     25
     26First, looking at low stack height connectors, but not Z-ray. 
     27(See Samtec [http://suddendocs.samtec.com/literature/samtec-high-speed-b2b-design-guide.pdf guide])
     28Samtec families with low stack heights:
     29
     30|| '''Family''' || '''Series''' || '''Stack Height''' || '''Notes''' ||
     31|| Sea-Ray || [https://www.samtec.com/products/lpam LPAM]/[https://www.samtec.com/products/lpaf LPAF] || 4mm ||
     32|| Edge Rate || [https://www.samtec.com/products/edm6 EDM6]/[https://www.samtec.com/products/edf6 EDF6] || 5mm ||
     33|| Q Series || [https://www.samtec.com/products/qth QTH]/[https://www.samtec.com/products/qsh QSH] || 5mm? || 28 Gbps+, pairs, power ||
     34|| || [https://www.samtec.com/products/qte QTE]/[https://www.samtec.com/products/qse QSE] || 5mm || 25A GND plane ||
     35|| Ultra-Micro || [https://www.samtec.com/products/edm6 EDM6]/[https://www.samtec.com/products/edf6 EDF6] || 5mm ||
     36|| || [https://www.samtec.com/products/lss LSS]/[https://www.samtec.com/products/lsem LSEM]/[https://www.samtec.com/products/lshm LSHM] || 5mm ||
     37|| || [https://www.samtec.com/products/st4 ST4]/[https://www.samtec.com/products/ss4 SSR] || 4mm ||
     38
     39Below is a figure with dimensions excerpted from the ATCA standard.
     40
     41|| [[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. ||
     42
     43Next, thinking about the logic.  Is it really that hard to make a common blade?  Here are some thoughts:
     44
     45* Build a blade to accommodate 3 mezzanine cards
     46* Plan for only "low speed" mezz-to-mezz communications \\
     47  (SelectIO or < 10Gbps SERDES)
     48* Mezzanine cards would have the optics on board along with DC/DC converters and regulators
     49* Split the CMS IT-DTC into 3 parts
     50* Eliminate the "blade FPGA" from the ATLAS design and designate one mezz card as "master" \\
     51  (this could be a different design).
     52
     53'''ATLAS requirements'''
     54
     55* Sector logic
     56