I said: > Depend on the type of your application, the UL1998 requires you to do either > 16-bit or 32-bit CRC. Actually, depend on the type of your application, the UL1998 requires you to do either a checksum, or a 8-bit CRC, or a 16-bit CRC. ----- Original Message ----- From: "Tony Pan" To: Sent: Wednesday, August 21, 2002 5:19 PM Subject: Re: [PIC]: What's "instruction set test"? > >> So what does UL1998 (?) specify ? > 1:2^N where N is the number of rom > bits you have ? ;-) > >> Are they saying that 'just testing it' is enough or is there a target > number ? > > Depend on the type of your application, the UL1998 requires you to do either > 16-bit or 32-bit CRC. > > If you don't do CRC, you can choose to do other tests on their list. You can > even come up with your own test as long as you can prove that your test is > equivalent to those on their list. > > Tony > > ----- Original Message ----- > From: "Peter L. Peres" > To: > Sent: Wednesday, August 21, 2002 3:10 PM > Subject: Re: [PIC]: What's "instruction set test"? > > > > On Tue, 20 Aug 2002, Spehro Pefhany wrote: > > > > >At 10:40 AM 8/20/02 -0700, you wrote: > > >> >Of course how do you know then that the ROM holding the checksum > algorithm > > >> >didn't flake out and cause the routine to report everything is OK? > > > > > >An 8-bit checksum has a 1 in 256 chance of giving a false "okay" anyhow. > > >But that is 256 times better than not checking at all. > > > > And more exactly, there is NO way to have a 1 in infinity chances of being > > wrong. So what does UL1998 (?) specify ? > 1:2^N where N is the number of > > rom bits you have ? ;-) Solving things by (incompetent) commitee has got > > enough history by now that people would notice these things, no ? Are they > > saying that 'just testing it' is enough or is there a target number ? > > > > Peter > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics