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What Is The "bug" In The Sst49lf020


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#1 btownsen4

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Posted 15 January 2009 - 01:22 AM

There seems to be alot of responses to the "why i cant use an alternative chip" question and the response is always a "quirk" or "bug" in the SST49LF020 chip. Can someone explain this bug in a technical manner? Im interested in building a 'cheap mod' and will construct a CPLD to interface if needed.

Thanks

#2 btownsen4

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Posted 15 January 2009 - 04:42 AM

Actually, I thought of a quick and easy way to "find" these features, I noticed the SST49LF020[A] does not work with the xbox, and theres this article, (www.sst.com/downloads/app_note/S72045.pdf).

Can someone confirm that the reason the A model does not work is because the System Memory Mapping redefinition? i.e. the SST49LF020A ignores LPC cycles outside of the new defined range?

Thanks

#3 StrictPuppet

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Posted 15 January 2009 - 06:37 AM

Sorry I cannot give you the technical reasons anymore for why that chip doesn't work. I am sure you could build your own cheapmod for ~$5, but since you can buy a doux2 for ~$11-13, it's hardly worth the effort anymore.




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