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Article #158

Re: 10ns and 60-70ns SIMMS at the speed of 100Mhz in a Pentium 100?

#158
From: Deutscher
Date: Tue, 23 Apr 1996 00:00
78 lines
3642 bytes
Yves Boisjoly (boisjol@ibm.net) wrote:
: In <4l9eei$gil@news.aros.net>, John Brush@aros.net writes:
: >
: >I don't know who wrote this statement, and it really doesn't matter. However,
: >I am getting way sick of people who do not know have a clue 
: >making assumptions and giving the impression that they know what
: >they are talking about.
: >
: >Anyone who tells you that you can't mix speeds (meaning a 60ns in place of
: >a 70ns) is a bigger liar than the person who fits the above scenario. If your
: >motherboard and bios supports 70ns RAM, you can put 10ns Ram in those 
: >slots and the system won't give a rat's ass! If you put a SLOWER device in,
: >then you have a potential problem.
: >
: >Now for the corny line. I design embedded controllers and computer systems
: >and I know what I am talking about. Challenge me, flame me, I don't care.
: >I do know what I a talking about in this area. Can't we all just get along?
: >
: >Thank you.
: >
: >Regards,
: >
: >John

: Hi John,

: I am so happy. May be you can respond this old old old question that I have in my 
: mind since about 5 years...

: If we take a Pentium 100Mhz, and try to found it speed in nano seconds, am I right 
: if a use this formula:

: 	frequency =1 / period

: so,

: 	period = 1 / frequency

: means

: 	period = 1 / 100 Mhz (100 000 000 hertz)

: equal

: 	0.000 000 010 seconds

: means

: 	10 nano seconds !!!

: Since we know that a Pentium 100Mhz actualy reach that speed internally, and 
: in my case, on my mother board, the clock of the PCI and data bus is actualy 
: running at the speed of 66Mhz, how can a Pentium 100 Mhz (66Mhz external) can
: access those 60-70 nano seconds chips, at 0 WAIT STATE ! ! ? ? ! !

How about
~>bc -l
1.0/66000000
.00000001515151515151

makes about 15 ns which is about what cache RAM has? Just an idea.  Stefan

: [=======================================
: [ Yves Boisjoly
: [ OS/2 Team.
: [ E-Mail: boisjol@ibm.net
: [ Phone:  (514) 522-5079
: [=======================================


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Stefan A. Deutscher, sad@utk.edu, (001)-423-[522-7845|974-7838|574-5897]
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From: sad@utkux.utcc.utk.edu (Deutscher)
Subject: Re: 10ns and 60-70ns SIMMS at the speed of 100Mhz in a Pentium 100?
Date: 1996/04/23
Message-ID: <4lhf1n$4c3@gaia.ns.utk.edu>
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