How much memory?

[Craig Pugsley]

Hi there,

I am wondering what the general concensus out there about how much
memory would be required to house a good EFI system.

The reason I ask this is there are several options for processor choice:
8k on chip eprom
16k on chip eprom
32k on chip flash eeprom, with boot rom to download code.
 (not sure if available yet)

The main reason I want on-chip eprom is that (if) the design proves
successful, I'd like to market it to a few freinds/acquaintances, but I
don't want some @#$@#$! stealing all my hard work.

Unfortuantely, the (e)eprom capacities are not all available for a
particular chip series (So, I can't start w/8k and then migrate up :-(

My guess is that 8k would be enough, even with a backup set of tables
(main tables stored in battery backed SRAM).

Obviously feeprom has the advantage of just hooking up the laptop to
download the latest version of code (plus being able to store fuel/ign
maps in there plus keeping external components to a mimimum.)

Also, is there such a thing as a socket for a 'quad flat pack' SMD IC.
I can find them for PLCC packages but not QFP, and QFPs are pretty hard
to wire wrap :-/ Any ideas?.

Craig.

pugsley at trl.oz.au