Re: [oc] EEPROM Programmers using FPGAs? now its EPROM vs FLASH time

[Daniel Haensse <daniel.haensse@alumni.ethz.ch>]

Hi Paul,

> I don't know much about FLASH memory, more acquainted with EPROMS from
> previous projects plus EPROMS are easy to get here. The development
> system is using 4 EPROMS to give me 4MBytes of space to store a copy of
> ucLinux on it (should be enough? lol). Final one will use a smaller
> EPROM or FLASH perhaps so I can send updates in the post or via the
> Internet.

>
> My final ucLinux computer is aimed to cost less than £25 (thats about
> USD $38), hence why I'm worried over the costs. There are 8bit 'Rabbit'
> computers on the Internet for $25 but mine is 32bit (OpenRISC hopefully
> so watch out Damjan!)
>
> 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?
if you're interested in such things, just feel free to post an email to the 
list at www.openhardware.net.
The nor-flash are interfaced like sram, the main difference is that you have 
to write a sequence to unlock the chip for commands like erase flash or write 
to a location. Another nice feature is that it is possible to read the size 
of the flash memory with this procedure, so you could use large and small 
flash memories. I wrote a application that programs the flash memories (runs 
under uclinux). You can find it in the tar on the project homepage

Dani

>
> Paul
>
> > -----Original Message-----
> > From: owner-cores@opencores.org [mailto:owner-cores@opencores.org]On
> > Behalf Of Daniel Haensse
> > Sent: 07 January 2002 11:00
> > To: cores@opencores.org
> > Subject: Re: [oc] EEPROM Programmers using FPGAs?
> >
> > > Its handy as he made it to program 27c801 chips, 8mbit (1M x 8bit
> > > configuration) which are the ones
> > > I am going to use for my ucLinux project so how handy is that?
> >
> > Why don't you use flash chips? This will be more comfortable to you!!
> >
> > Dani
> >
> > > Paul
> > >
> > > -----Original Message-----
> > > From: owner-cores@opencores.org [mailto:owner-cores@opencores.org]On
> > > Behalf Of Alasdair Hatfield
> > > Sent: 06 January 2002 11:17
> > > To: cores@opencores.org
> > > Subject: Re: [oc] EEPROM Programmers using FPGAs?
> > >
> > >
> > > Paul
> > >
> > > Take a look at www.hed.de or www.hed-software.com. He sells eprom
> > > programmers for very reasonable prices and the support is excellent. If
> > > you are looking at a commercial project then you don't want to burn
> > > time lashing together your own.
> > >
> > >
> > > Good luck in the commercial world!!
> > >
> > >
> > > Alasdair
> > >
> > >
> > >
> > > Paul McFeeters wrote:
> > >
> > >
> > > Hi,
> > >
> > > I was recently looking at buying an EEPROM programmer for my first
> > > commercial hardware project
> > > and was surprised to see the price of them. Being frugal (Irish) I
> > > don't see why I shouldn't
> > > just use one of my FPGAs to program the EPROMs so I just thought I
> > > would ask if anybody has
> > > heard of this being done before or has any helpful views/ideas for it.
> > > It might make a nice
> > > new OC project?
> > >
> > >
> > > Paul McFeeters
> >
> > --
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