Messages in this thread | | | Subject | Re: Patch: BadRAM put to use | Date | Sat, 25 Mar 2000 14:39:14 +0100 (MET) | From | (Rogier Wolff) |
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Rick van Rein wrote:
> has to be extremely pure. And every chip has to be 100% correct for > acceptance, which is not strictly necessary for everything, at least > not for RAM chips.
Not true: RAM chips are produced with say 33 banks where in theory 32 would suffice. Every bank can be disabled and replaced by the "spare" one. There is a bunch of fuses that disables one of the 33 banks, and can program the spare to fill in for the disabled bank.
The ones where the 32 primary banks are enabled and the spare is disabled is slightly faster than the ones where the spare has to be used.
So single-error RAM chips are used for production.
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* * Common sense is the collection of * ****** prejudices acquired by age eighteen. -- Albert Einstein ********
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