In message <[EMAIL PROTECTED]>, Bruce Griffiths writes: >You don't actually require a latch for each input as long as flag bits >(one per input channel) are used to denote which transitions occurred at >the latched count. >The flag bits should be latched along with the count.
The latches are for resolving meta-stability issues between the two clock domains. >Using a PCI card is perhaps a recipe for planned obsolescence. >If the input transition rates are relatively low (eg with PPS inputs) >then an onboard microprocessor with a serial port has more than >sufficient bandwidth to keep up. Yes, but using a PCI card makes it possible to use the setup as timebase for your computer as well :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
