[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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