Poul-Henning Kamp wrote: > 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. > > You still dont need a dedicated time count latch for each channel. A pair of time count latches should suffice (one for each counter/synchroniser clock transition polarity) plus a flag bit for each channel. Latch the flag bits and the count in both sets of latches. >> 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 :-) > > It can also add considerable ground noise potentially corrupting otherwise clean signals.
Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
