[Cryptech Tech] External review of Alpha schematics

[Fredrik Thulin]

On Monday, January 25, 2016 03:31:02 PM Joachim Strömbergson wrote:
> Aloha!
> 
> Really good review by Kent. Eight hours well spent.
> 
> One thing I note is that Kent seems to suggest changing from a QFP to
> BGA for the M4-chip. My impression was that we wanted not to use BGA
> unless we really had to.
> 
> The FPGA is only available in BGA package so we will need to be able 
to
> handle BGAs. But would we gain anything by switching to BGA for the M4
> too? The pitch is bigger with BGA, but having exposed legs makes QFP
> easier to debug.

I'm thinking the same thing - for the Alpha staying with the QFP package 
essentially gives us 208 "test points". For a future Alpha2, it might 
very well make sense to move to BGA.

/Fredrik
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