SHAMELESS EFI332 PROMOTION - was Re: ECUs
Andrew Dennison
adennison at swin.edu.au
Tue Jan 23 23:51:04 GMT 1996
On 22 Jan 96 at 7:50, Paul E. Campbell wrote:
>
> I'll bite this time. Why use flash memory over a serial EEPROM? I
> can only think of three reasons:
>
> 1. You've got a PCMCIA slot for the world's easiest reprogramming.
The CPU can reprogram its own flash, it's also a hell of a lot faster
to program FLASH than EEPROM.
> 2. Faster read/write times (overkill if it already uses battery
> backed RAM).
> 3. Denser storage.
4. Flexability - use SRAM for development and flash for final code
storage, whatever.
We intend to use serial EEPROM for some data storage on the I/O
board. The processor board (which I was discussing) was developed to
be general enough that it could be used for any generic 68332
application. I know you could build a basic EFI system with an 8 bit
micro of any flavor and 2K of memory (yea - lets also write in
machine code :), but for not much more money you
can have a 32bit system with heaps of memory and not have to worry
about running out of memory, cpu time, etc.
>
> The serial stream format is kind of awkward but trivial to use once
> you get working subroutines written.
These serial devices are great for extra I/O, EEPROM, etc
> They cost about $5 for a 4K chip, which equates to about 3 months
> for my data logger purposes. That's also about the size of the
> storage requirements I've seen quoted on the EFI list for their
> engine lookup tables.
FLASH $9 for 128K.
Sometimes it's worth remembering that your way isn't the only way:)
Andrew
------------------------------------
Andrew Dennison - Research Associate
IRIS - Industrial Research Institute - Swinburne University
545 Burwood Rd. Hawthorn Victoria 3122 Australia
Phone: +61 3 9214 5033 Fax: +61 3 9214 5050
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