Re: O.T.: Basic Transistor Engineering Question Message #2 Posted by Gordon Dyer on 4 Nov 2007, 6:44 p.m., in response to message #1 by Ed Look
It is a complex battle of both technology trade-offs and vested interests by semiconductor manufacturers.
See this article for appliations in mobile hansets:
http://www.embedded.com/columns/technicalinsights/165701775?_requestid=82339
Quoting from the end of the article: "Right now, NAND still lags NOR in read speed, while NOR is considerably behind NAND in density. Until one technology can bridge the advantage gap offered by the other, there will continue to be cases, such as in the NEC FOMA 900iL handset, where NAND and NOR can, and will, co-exist."
INTEL and ST are continuing to push their NOR technologies and now are competing better on density by using 4 levels in a cell to store 2 bits per cell.
http://www.st.com/stonline/products/promlit/pdf/flnormob1005.pdf
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