Re: DRAM accommodations

From	Bill Sloman <bill.sloman@ieee.org>
Newsgroups	sci.electronics.design
Subject	Re: DRAM accommodations
Date	2024-09-18 00:04 +1000
Organization	A noiseless patient Spider
Message-ID	<vcc28s$3hn5f$1@dont-email.me> (permalink)
References	<vbdcrs$gp01$1@dont-email.me> <VLfGO.187084$QvZa.39165@fx08.ams4>

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On 17/09/2024 11:47 pm, Chris Jones wrote:
> On 6/09/2024 8:54 am, Don Y wrote:
>> Given the high rate of memory errors in DRAM, what steps
>> are folks taking to mitigate the effects of these?
>>
>> Or, is ignorance truly bliss?  <frown>
>>
> 
> Do we know whether DRAM chips implement ECC internally? It seems an 
> obvious thing for them to do. Of course it wouldn't help with bad solder 
> joints on the DIMM, but it would help with many kinds of faults on the 
> chip.

It seems unlikely. The only ECC coding that I got close enough to  plan 
to implement used a 72-bit word to protect 64-bits of the word content.

I suppose there might be serial access DRAM chips that would spit out 
64-bit words, and they could offer ECC protection inside the chip by 
adding the 8-bit checksum when the data went in, and using it to correct 
the output whenever the data was read out.

-- 
Bill Sloman, Sydney

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Thread

DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-05 15:54 -0700
  Re: DRAM accommodations john larkin <jl@650pot.com> - 2024-09-05 16:54 -0700
  Re: DRAM accommodations Bill Sloman <bill.sloman@ieee.org> - 2024-09-06 16:15 +1000
  Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-06 12:31 -0700
    Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-06 17:43 -0700
    Re: DRAM accommodations Bill Sloman <bill.sloman@ieee.org> - 2024-09-07 15:07 +1000
    Re: DRAM accommodations albert@spenarnc.xs4all.nl - 2024-09-07 11:56 +0200
      Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-07 04:04 -0700
        Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-07 04:06 -0700
          Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-07 04:08 -0700
        Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-07 05:01 -0700
        Re: DRAM accommodations john larkin <jlarkin_highland_tech> - 2024-09-07 07:35 -0700
    Re: DRAM accommodations Waldek Hebisch <antispam@fricas.org> - 2024-09-17 00:33 +0000
      Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-16 19:05 -0700
        Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-16 19:31 -0700
        Re: DRAM accommodations antispam@fricas.org - 2024-09-17 16:12 +0000
          Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-17 11:57 -0700
  Re: DRAM accommodations Chris Jones <lugnut808@spam.yahoo.com> - 2024-09-17 23:47 +1000
    Re: DRAM accommodations Bill Sloman <bill.sloman@ieee.org> - 2024-09-18 00:04 +1000
    Re: DRAM accommodations Don Y <blockedofcourse@foo.invalid> - 2024-09-17 07:57 -0700

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