Spehro, thank you for reply.

>> If you need to meet UL1998 safety standards, you simply cannot do it with
this chip.

This is like a death sentence to me project. I do have to meet UL1998. My
software application is Class 2. Can this chip do any ROM check that meets
UL1998 at all? How do I tell which chip can do or cannot?

Many thanks!

Tony

----- Original Message -----
From: "Spehro Pefhany" <speff@INTERLOG.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 12, 2002 3:14 PM
Subject: Re: [PIC] How to do CRC on the ROM?


> At 02:46 PM 8/12/02 -0400, you wrote:
>
>
> >First off, many thanks for helping me my question "How to check if an
input
> >gets stuck?"
> >
> >Now I need to do CRC check on ROM as well. I will also have to do RAM
check.
> >
> >I will ask about CRC first.
> >
> >I already understand how CRC works and have a routine to calculate a
16-bit
> >number's CRC.
> >
> >But I don't know how to apply the routine to check the program ROM and
data
> >ROM. (I use a small chip 12CE519.)
>
> Real simple, Tony, you don't. If you need to meet UL1998 safety standards,
> you simply cannot do it with this chip. You have to pick one that allows
you
> to read the program memory, either from Microchip or from someone else.
>
> Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the
reward"
> speff@interlog.com             Info for manufacturers:
http://www.trexon.com
> Embedded software/hardware/analog  Info for designers:
http://www.speff.com
> 9/11 United we Stand
>
> --
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>
>

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