Post by thread: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. 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_OUTstephenTakeThisOuTconcord.org, http://www.concord.org

> Date: Fri, 13 Dec 1996 12:05:31 -0500 > From: Stephen Bannasch <.....stephenKILLspam@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 > stephenKILLspamconcord.org, http://www.concord.org >

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 | | .....liebchenKILLspam.....ffo.fgan.de | +-----------------------------------------------------+

Wolfram Liebchen wrote: {Quote hidden}> > 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 f|r Optik, T|bingen, Deutschland | > | EraseMEliebchenspam_OUTTakeThisOuTffo.fgan.de | > +-----------------------------------------------------+ 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