[time-nuts] PCI IRIG receiver card for AIX?

[Joseph M Gwinn]

time-nuts-bounces at febo.com wrote on 05/28/2009 11:08:31 AM:

> And depending on what you mean by "industrial grade", they also have
> the bc635 board in a CompactPCI form-factor, too.  Or at least they
> used to some years ago.

I remember that card from 1995!  The BC635 would be suitable.  If still 
made.

 
> I don't know what sort of drivers they have for AIX.  I didn't use
> their drivers for FreeBSD (v3.0 back at the time), but you could
> probably cobble up a pretty minimal driver or use existing OS
> facilities to just memory-map the PCI device registers which
> you can manipulate from user space.  As I recall, when you perform
> a read-access on one of the registers, it will latch a 64 bit
> timestamp into two other device registers that you can read at
> your leisure.  There are other capabilities, like programmable
> interrupt generation that the board can perform, too.

I don't know of an AIX driver, but perhaps...

That's how I would do the driver as well.  I'm trying to buy something, if 
possible, and in any case given the expense of writing a driver the 
question will surely come up.

 
> On interesting experiment I did with the bc635 was to program it
> to generate an interrupt, and then latch the time in the
> interrupt service routing to measure interrupt latency.  Pretty
> scary sometimes..

I would be doing something not quite that dangerous.

I need to trigger software to talk to hardware on a fixed schedule about 
15 times a second, where the hardware has hardware (10 MHz and 1PPS) 
access to the time, and complains if commands arrive too late.

Joe G


> louie
> 
> 
> 
> On May 27, 2009, at 10:49 PM, Lux, James P wrote:
> 
> > Symmetricom bc635pci-V2 or -U?  PCI-SG 2U
> > (some of the old TrueTime products, I'm sure)
> >
> > It does IRIG... You'll have to call Symmetricom to see about 
> > drivers.. It has Win, Linux, and Solaris.
> >
> >
> > On 5/27/09 7:26 PM, "Joe Gwinn" <joegwinn at comcast.net> wrote:
> >
> > Does anybody know of any PCI cards that will receive IRIG-B time
> > signals and come with an I/O driver for AIX (IBM's flavor of UNIX)?
> > Industrial-grade commercial products are preferred.
> >
> > Thanks,
> >
> > Joe Gwinn
> >
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> bounces+gwinn=raytheon.com at febo.com; from=louie at transsys.com; 
> date=May 28, 2009 3:09:34 PM; subject=Re: [time-nuts] PCI IRIG 
> receiver card for AIX?)