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From: johne@hpvcfs1.HP.COM (John Eaton)
Newsgroups: comp.arch
Subject: Re: Questions about DRAM's
Message-ID: <1080005@hpvcfs1.HP.COM>
Date: 9 Apr 90 19:02:44 GMT
References: <28686@cup.portal.com>
Organization: Hewlett Packard, Vancouver, WA
Lines: 17

<<<<
< Also, will pseudostatic DRAM's eventually win?  I notice the Hitachi PRAM's
< are just as dense as their DRAM's (4Mb).  I suppose this means that the extra
< logic required to get the maximum user-friendly refresh mechanism is now
< a tiny % when compared to the size of the memory planes.
----------
Pseudostatics really don't compete directly with normal DRAM's. A good rule
of thumb is if your memory needs will fit in eight or fewer IC's then use 
pseudo's otherwise use normal DRAMS. For large systems the lower pin count 
of normal drams means lower parts cost and fewer traces that offsets the
extra cost of the address mutliplexor. 


John Eaton
!hpvcfs1!johne