[time-nuts] Prologix VRBOOT error

Matt Ettus boyscout at gmail.com
Wed Jun 18 13:33:16 EDT 2008


I just wanted to let everyone know that with the help of a firmware
upgrade and some great support from Abdul, we no longer have any
problems with the Prologix GPIB interface.

Not having to rebuild GPIB drivers every time the kernel gets upgraded
is a huge win for us.

Thanks,
Matt


On Wed, Jun 4, 2008 at 6:50 AM, Prologix <support at prologix.biz> wrote:
> Matt,
>
> We are testing a fix. I'll be in touch soon.
>
> Regards,
> Abdul
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Matt Ettus
> Sent: Wednesday, June 04, 2008 12:40 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Prologix VRBOOT error
>
> On Tue, Jun 3, 2008 at 5:31 PM, Prologix <support at prologix.biz> wrote:
>> Short version:
>> Connect USB cable before connecting GPIB, and leave USB connected and
>> powered.
>
> That isn't realistic for my setup.
>
>> Long version:
>> On startup, if one of the MCU I/O lines is pulled low, the controller will
>> enter firmware update mode. As it happens, this I/O line is also one of
> the
>> GPIB bus signals. Some instruments seem to have stronger pull-down on the
>> bus lines than others. The controller may enter firmware update mode, if
> the
>> USB cable is plugged in while the controller is connected to such an
>> instrument. Since the pull-down is passive, this behavior could happen
> even
>> if the instrument is powered down when connecting USB.
>
> Honestly, this sounds like a serious design flaw to me.  I have 5 GPIB
> instruments, and 3 of them cause this behavior.  If 3 pieces of test
> equipment from 3 different manufacturers cause this behavior, it must
> be pretty common.
>
> Matt
>
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