[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [oc] EEPROM Programmers using FPGAs? now its EPROM vs FLASH time
Hi Paul,
Am Dienstag, 8. Januar 2002 10.45 schrieben Sie:
> Dani,
>
> Hell yes, I love FLASH (just finished reading up on the Am29PL160C units).
> 70ns for initial page access and then 25ns for within same page access is
yes, just make sure this values also depent on the supply voltage (around
20ns). I'm not sure about the 25ns. If this is true and you can make a smart
access algorithmus, this will give you the speed as you would have a cache in
the design.
> a hell of a lot faster than the last time I looked at them and over 10x
> cheaper per megabyte. The am29 unit is 16mbit (2Mbyte with a 16bit
> interface) so I can buy a 2Mbyte FLASH cheaper than a 1Mbyte EPROM.
> Definitely going to use them on my board, will revise my costing targets.
> Also going to look at making my OpenRISC design use them as part of the
> main memory for the programs, the DIMM socket is not such a priority now.
yes, we use fujitsu flash 2MB=USD$9 (small quantities 10 to 20 pieces)
Dani
>
> Thanks
>
> Paul
>
> > -----Original Message-----
> > From: owner-cores@opencores.org [mailto:owner-cores@opencores.org]On
> > Behalf Of Daniel Haensse
> > Sent: 08 January 2002 07:12
> > To: cores@opencores.org
> > Subject: Re: [oc] EEPROM Programmers using FPGAs? now its EPROM vs FLASH
> > time
> >
> >
> > 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
> > > >
> > > > --
> > > > To unsubscribe from cores mailing list please visit
> > > > http://www.opencores.org/mailinglists.shtml
> >
> > --
> > To unsubscribe from cores mailing list please visit
> > http://www.opencores.org/mailinglists.shtml
--
To unsubscribe from cores mailing list please visit http://www.opencores.org/mailinglists.shtml