🚀 go-pugleaf

In article <1992Jul22.210053.10960@gandalf.ca> jmclaugh@gandalf.ca (Jim Mclaughlin) writes:
>In article <TMH.92Jul22194404@keks.first.gmd.de> tmh@keks.first.gmd.de (Thomas Hoberg) writes:
>>
>>Hmm, I was always under the impression that even the 486 used a 2x
>>clock up until the 486DX[2]50, which uses a 1x clock. Anyway I have a
>>66MHz oscillator on my 486/33 motherboard.
>>---
>I'm looking at page 2-177 of the 1992 Intel Microprocessor data book
>
>For the 50 MHz 486 part the minimum input frequency is 16MHz, and the
>maximum input frequency is 50MHz.  There is a note for this saying that
>it is a 1x CLK to Intel 486.  The spec also calls for the clock symetry
>to be no worse than 56-44, with .1% stability.
>
>For those out there with a 2x oscillator on the motherboard, it is likely
>that the support chip set needs the 2x, cause the CPU don't.....


Also, keep in mind a 2x clock may be divided by a simple clocked flip-flop
to derive the clean 1x clock.

-- 
 * Dana H. Myers KK6JQ 		| Views expressed here are	*
 * (213) 337-5136 		| mine and do not necessarily	*
 * dana@locus.com  DoD #466 	| reflect those of my employer	*
 * "Dammit Bones, spare me the lecture and give me the shot!"   *