[time-nuts] Data collection cycle -- multiple sources to one counter?

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Jun 20 17:01:12 EDT 2005


Instead of minicircuits I would be looking for video-cross-bar chips.

Maxim as a bunch:

http://para.maxim-ic.com/compare.asp?Fam=Vid_Mux_Buff&Tree=SwitchMux&HP=SwitchMux.cfm&ln=

A MAX458 8x4 switch would be able to drive two counters which could
measure any two of eight sources against each other.

	http://pdfserv.maxim-ic.com/en/ds/MAX458-MAX459.pdf

There is even an eval board which does most of the job already:

	http://pdfserv.maxim-ic.com/en/ds/MAX459EVKIT.pdf

As far as I can tell you could drive it from a parallel port
with bit-banging.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.




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