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'fast serial memory?'
1996\12\13@120437 by Stephen Bannasch

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I'm looking for a type of data storage memory which can be accessed serialy
while still written to and read from at speeds up to 10K bytes per second.
I need a minimum storage of 8K.  A write speed of 50K would be great.

The application is in a data interface/logger which can log data slowly as
well as capturing medium-speed signals.

EEPROM or Flash would be nice but is not necessary because the system will
operate from a battery.

Any ideas?



--Stephen Bannasch
 Director of Technology, Concord Consortium
 37 Thoreau St., Concord, MA  01742
 tel: 508 371 3477, main number: 508 369 4367, fax: 508 371 0696
 spam_OUTstephenTakeThisOuTspamconcord.org, http://www.concord.org

1996\12\13@130306 by : pklammer

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> Date: Fri, 13 Dec 1996 12:05:31 -0500
> From: Stephen Bannasch <.....stephenKILLspamspam@spam@CONCORD.ORG>
> Subject: fast serial memory?
>
> I'm looking for a type of data storage memory which can be accessed serialy
> while still written to and read from at speeds up to 10K bytes per second.
> I need a minimum storage of 8K.  A write speed of 50K would be great.

Ramtron FRAM is available in I2C (100kbps or 400kbps) and SPI (2Mbpx)
interfaces, in 2KB packages.  The SPI arrangement would cost you
3 common bus pins (MOSI, MISO, SCK) plus one select (CS*) per chip.
There is an addressable variety of the I2C part that lets you put up
to 8 packages on the same bus, which costs you just 2 pins (SCL, SDA).

Try http://www.ramtron.com, or (800)545-FRAM; I have purchased retail in the
past from Lange Sales, (303)795-3600.

> --Stephen Bannasch
>   Director of Technology, Concord Consortium
>   37 Thoreau St., Concord, MA  01742
>   tel: 508 371 3477, main number: 508 369 4367, fax: 508 371 0696
>   stephenspamKILLspamconcord.org, http://www.concord.org
>

1996\12\17@034227 by Wolfram Liebchen

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At 12:05 13.12.96 -0500, Stephen wrote:
>I'm looking for a type of data storage memory which can be accessed serialy
>while still written to and read from at speeds up to 10K bytes per second.
>I need a minimum storage of 8K.  A write speed of 50K would be great.
>

Hi Stephen,

you could use a 3-wire to bytewide converter (Dallas DS1280) and connect a
standard SRAM or a nonvolatile SRAM (Dallas DS1230).
This gives you SPI-bus access to a large RAM-size.

Look at http://www.dalsemi.com/DocControl/index.html
there is the information.

regards,

Wolfram



+-----------------------------------------------------+
| Wolfram Liebchen                                    |
| Forschungsinstitut fŸr Optik, TŸbingen, Deutschland |
| .....liebchenKILLspamspam.....ffo.fgan.de                         |
+-----------------------------------------------------+

1996\12\17@093730 by Jens Dyekjfr Madsen

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Wolfram Liebchen wrote:
{Quote hidden}

Serial sampling with DRAM:
     !4x sample clock
     !                    256Kx8 DRAM-module
*----------*                   *--------*
!20-bit  A0!------------------>!/CAS    !
!counter   !  *------------*   !        !
!        A1!--! 20ns delay !-->!/RAS    !
!          !  *------------*   !        !/--\
!       ...!                   !  D0..D7!     Din/
!          !                   !        !\--/ out
!          !------------------\!        !
!  A10..A19!                   !A0..A8  !
!          !------------------/!     /WE!---- R/W
!          !                   !     /OE!---- /OE
*----------*                   *--------*

Regards,
Jens Dyekjaer Madsen

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