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How to model cosmic ray corruption of DRAM memory?

Bob Day
Posts: n/a
      01-28-2009, 07:56 PM
I'd like to study how well Chipkill advanced ECC detects
multiple errors in a DRAM memory module. I've written software
that implements the Chipkill algorithm, and now I'm seeking more
detail about exactly how cosmic rays can corrupt DRAM bits.
Such as, when a cosmic ray changes a bit in DRAM, how many
adjacent bits on the average are likely to be affected as well?
What would be the probability density of the number of bits altered
per cosmic ray strike? Of course, it's likely to depend on the density
of the DRAM. I'd much appreciate any information anyone can
provide on this.

--Bob Day

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Junior Member
Join Date: Sep 2007
Location: Czech republic
Posts: 22
      01-31-2009, 04:23 PM
I did not tell you how to model it, but if you can get hold of the mobile X-ray machine used on operation rooms (basically, it is just a _big_ "C" letter) and place the simulated to get errors DRAM memory into the target area, then you fire up the Xray and you get your corruption.
Wear the safety apron, tough

Cosmis rays are basicaly Xrays and others, as Sun was generating all the frequency spectrum of them. Same is true for any unshielded atomic reactor, except the the Sun is way way much more powerfull.
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