Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.arch.embedded > #27072

Re: Datakey silicon inside

Show all headers | View raw

On 7/22/2017 2:28 PM, Tim Wescott wrote:
> On Wed, 19 Jul 2017 17:34:43 -0700, John Speth wrote:
> 
>> On 7/19/2017 4:51 PM, Robert Wessel wrote:
>>> On Wed, 19 Jul 2017 16:35:40 -0700, John Speth <johnspeth@yahoo.com>
>>> wrote:
>>>
>>>> Hi folks-
>>>>
>>>> Does anybody know what memory devices are embedded in the Datakey
>>>> memory tokens?
>>>>
>>>> For example, this part:
>>>>
>>>> http://datakey.com/downloads/SST_Series_DS_REVD.pdf
>>>>
>>>> which is from datakey.com.
>>>>
>>>> I'm pretty sure these devices are just embedded serial EEPROMs but
>>>> Datakey doesn't reveal the part inside.
>>>
>>>
>>> They say it's an SPI EEPROM, and the interface exposes the usual set of
>>> signals.  Why wouldn't you believe them?  I mean it's possible they
>>> have some sort of SPI interface device and some other sort of ROM
>>> behind that, but if they do, it'll still look like an SPI EEPROM to
>>> you.
>>
>> I want to replicate the token in a new circuit design that embeds a
>> token within.  I need to know the exact EEPROM part number so I don't
>> have to embed the whole datakey token.  My plan has size and cost
>> advantages.
>>
>> You could be right about extra chips inside but the data sheets don't
>> give any hints about any additional chips.  The interface specs are
>> suspiciously similar to the famous 25LC320A EEPROM but there are enough
>> differences that excludes the 25LC320A.
>>
>> John
> 
> Is the 25LC320A customizable?  Could they be buyin' and bashin'?
> 
> Alternately (and horribly, from your point of view), could they have
> enough business that they buy semi-custom parts?

It's like you're reading my mind, Tim.  It's a risk.

JJS

Back to comp.arch.embedded | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-19 16:35 -0700
  Re: Datakey silicon inside Robert Wessel <robertwessel2@yahoo.com> - 2017-07-19 18:51 -0500
    Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-19 17:34 -0700
      Re: Datakey silicon inside Tim Wescott <seemywebsite@myfooter.really> - 2017-07-22 16:28 -0500
        Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-24 09:37 -0700
      Re: Datakey silicon inside Theo Markettos <theom+news@chiark.greenend.org.uk> - 2017-07-23 23:30 +0100
  Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-25 13:32 -0700

csiph-web