I have used a flash chip from a company called MXIC (I think that it is
also sometimes called just MX). I think that the part number was
something like F4000. I is a 4Mbit FLASH chip. While it DOES require that
you erase in blocks, it didn't require writes to come in blocks. It is
very easy to use, and I think that AMD and maybe Atmel might make similar
parts. AFAIK, most flash chips allow single byte writes, its just erasing
that needs to be done block or whole chip at a time.

Sean


On Fri, 17 Jul 1998, Mike Keitz wrote:

> On Fri, 17 Jul 1998 07:58:24 -0600 Matt Bonner <mbonner@SUNADA.COM>
> writes:
>
> >I believe that you have to erase the whole page.  To get the density
> >that flash offers (as opposed to EEPROM), you lose some functionality.
>
> True, you must write exactly 264 bytes to the Flash array at a time.  But
> the chip has two 264-byte RAM buffers so it is possible to modify part of
> a 264-byte page without having to move data out of the chip and back in
> (read to RAM, change some bytes in RAM, write back to Flash).  I've just
> looked over the data sheet and it looks like a nice part.  Strangely
> though they don't mention anything about endurance.
>
> > don't know what the availability is.
>
> How available is the 4M part?  Has anyone bought one?
>
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