RE: [oc] EEPROM Programmers using FPGAs? now its EPROM vsFLASH time

["Paul McFeeters" <paul.mcfeeters@ntlworld.com>]

chen,

ta, will make note of this. No running program and data space in FLASH then I guess.
Will keep it for BIOS/static data then. Nuts would have been great as a write-cache
for the harddisc.

Paul

> -----Original Message-----
> From: owner-cores@opencores.org [mailto:owner-cores@opencores.org]On
> Behalf Of Zhichong Chen (Beijing)
> Sent: 08 January 2002 12:25
> To: 'cores@opencores.org'
> Subject: ??: [oc] EEPROM Programmers using FPGAs? now its EPROM vsFLASH
> time
> 
> 
> 
> It's very easy to use FLASH.
> Martin has explained the speed of FLASH,but the one thing should be
> carefully treated using FLASH, which is
> it's life time.As you know FLASH has write access times limitation, when a
> position in FLASH have been rewriten
> up to 100,000 times it will be crashed that means you will lost your data
> which stored in this position.So you need
> schedule the writing access very soomthly to extend the total FLASH RAM
> lifetime.
> 
> sincerely
> chen
> 
> Hi Paul,
> <snip>
> >
> >How easy is it to use FLASH? As easy as SRAM? What sort of access speeds
> >do you get from them? And how much do typical units cost?
> >
> 
> It's as easy to read as SRAM, 80-120ns access times are typical.  Writing is
> accomplished by sending (writing) a series of commands and data to the
> device, for erasing pages of memory and then writing the data values and
> write protecting and so-on.  AMD have good datasheets on their devices.
> Dunno about prices, I tend to scrounge samples most of the time at the
> moment :-)
> 
> Cheers,
> Martin
> 
> 
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