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To: yard_man who wrote (36546)	7/27/1998 12:54:00 PM
From: sam dram	Read Replies (2) \| Respond to of 53903

Simple math, a pc with 64meg of DRAM has 64meg X 8 =512 megabits of DRAM, current high volume part is the 64Meg DRAM a 512Meg DRAM will need 1 Gbit technology which by itself is probally 5 years away from mass production. But the more compelling reason beyond that is that DRAM's yield 80%+ probe test yields and MPU's yield probally 20-50% probe yields so if you try to embedd say 512Meg of DRAM on a Merced type processor if either the DRAM or the MPU is bad then both are bad, low yields would make it very cost prohibative to embedded main DRAM with a MPU. Also the technical issues would be interesting, DRAM's typically run 2-3 layers of metal where MPU's are running 5 levels of metal with sailicide junctions(salicided junctions in the past have been death to DRAM's). These are just some of the issues, what you will probally see is first the embedded graphics chips because of pure band width issues and possible a MPU with some embedded DRAM as a link between the MPU chip and main memory. Just my thoughts. Sam