The standard TS-XDIO on both the 7260 and 7300 work very well. You only need to supply an external high speed signal conditioner to change voltage levels and also with schmidt trigger. The 7300 is extremely sensitive and you MUST have a very fast rising and falling input. If the time between the pulses is slow enough, then do as the other poster suggested and write a device driver to count interrupts, it is not that wild of an idea, actually very good! I am not sure what the maximum speed would be, but it should be in the hundreds of pulses per second. Again, you would need some minimal signal conditioning with schmidt trigger.
On 9/23/07, naturalwatt <> wrote:
I have an application that needs to count pulses coming in from two electricity meters. The
pulses are about 10mSec, so it would be (barely) possible to watch for them in a program,
but I am worried about missing pulses when the system load is non-zero.
It would seem better to use a hardware counter, and read it every minute or so. Searching
the list, Peter Elliott mentioned TS-XDIO. This seems to be a feature of the 7260 only, and
having read the manual, I am still not clear if it does what I want. Our standard platform is
the 7250, although I have used a 7260 in one instance.
I need *two* counters, of minimum 8 bits, preferably more, that can be read and reset by
software. I want to avoid external hardware. Do I need to read the 7260 manual even more
slowly?
Or is this something I should ask Technologic to do within the FPGA? Or hire someone else
to write some FPGA configuration?
I don't really understand my options here - please be gentle with me!
Martin
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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