Hi Olin,

Could you emulate the EEPROM with the PIC? Then you have complete control
over the contents and can avoid it being written over.

Assuming you have the pins free and the time to write the code for a slave
microwire system.. Haven't tried, could be nasty.

Cheers,
Ash.

---
Ashley Roll
Digital Nemesis Pty Ltd
www.digitalnemesis.com
Mobile: +61 (0)417 705 718

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Olin Lathrop
> Sent: Friday, 20 December 2002 9:24 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: USB interface chip experience?
>
> Yeah, I'm not real comfortable with the fact that the EEPROM can be
> changed from the host.  I'd rather set it once and enable some sort of
> write protection, but the EEPROMs they spec don't have that.  Oh well.
>
> I'll probably wake up holding the FTDI chip in reset and have the PIC
> checksum the EEPROM.  If it isn't right, it will load it
> before releasing
> the FTDI chip.

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