External Cloking of Altera MAX 7000S - comp.arch.fpga

Message from discussion External Cloking of Altera MAX 7000S

Moussa Ba

More options Oct 7 1999, 3:00 am

Newsgroups: comp.arch.fpga

From: Moussa Ba <b...@eng.umd.edu>

Date: 1999/10/07

Subject: Re: External Cloking of Altera MAX 7000S

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Thank you for your reply. I forgot to mention in my email that I did use a TTL
crystal oscillator. And I still get a messed up signal as soon as I connect the

clock to the clock input of the MAX chip.

P.S.: I am an alumni of University of Arizona, currently in Maryland, how is
Tucson?

> You can't use a crystal by itself, like you can on some microcontrollers.
> Crystals do not have TTL (or CMOS) outputs. You need to buffer it (the
> common trick is to use unbuffered CMOS inverters; I forget the part number).
> Save yourself some grief and buy a 4 MHz TTL-out oscillator.

> -- a
> -----------------------------------------
> Andy Peters
> Sr Electrical Engineer
> National Optical Astronomy Observatories
> 950 N Cherry Ave
> Tucson, AZ 85719
> apeters (at) noao \dot\ edu

> "Creation Science" is oxymoronic.

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