I agree with Jason that you should definitely apply the fix, but afaik this has only caused a problem when actually using the un-patched ports.
- Andrew On 11/18/10 10:25 PM, "Jason Manley" <[email protected]> wrote: >> As far as I know, my iBOB has not been patched with >> nylon washers. Just to clarify, this would be a problem even if I'm >> not using 10 GbE in my design? > Yeah, this might well be your problem. Even if it's not affecting you now, you > should patch your board. Especially if you're using the iBOB faceplate (which > seems to apply more pressure to the connector). This problem is present > whether or not there is a cable plugged in, irrespective of your bitstream. > There is a voltage short due to a track being routed under a screw head. See > the aforementioned memo for details. The original email went out to the > mailing list from Andrew Siemion on 15 May 2008 > http://www.mail-archive.com/[email protected]/msg00187.html > > Jason > > >> >> >> >> On Thu, Nov 18, 2010 at 12:26 AM, Jason Manley <[email protected]> wrote: >>> Yes, and related to that is the iBOB CX4 fix with nylon washers. Has yours >>> been patched? This causes trouble even if there's no cable plugged in as it >>> shorts out a voltage rail. See Memo22: >>> http://casper.berkeley.edu/papers/Science_Safety_001.pdf >>> >>> Jason >>> >>> On 18 Nov 2010, at 07:06, Andrew Martens wrote: >>> >>>> Hi Laura >>>> >>>> I have seen strange iBOB behaviour due to an incorrectly plugged in CX4 >>>> cable. It must have been bumped at some point and, although still plugged >>>> in, >>>> was causing strange behaviour. The iBOB would report being successfully >>>> programmed but the LEDs would do strange things. Not sure if this is >>>> related to your problem though. >>>> >>>> Regards >>>> Andrew >>>> >>>> >>>> >>>> On 17 November 2010 21:11, Laura Spitler <[email protected]> wrote: >>>> Hi everyone, >>>> >>>> I'm having a problem with an iBOB-based spectrometer. The design is a >>>> simple instrument used to measure neutral hydrogen for our >>>> undergraduate radio lab course. The spectra are transmitted over the >>>> 10/100 Mb ethernet using a modified main.c file where I read the >>>> channels out of a shared BRAM, packetize them, and send the using UDP. >>>> They are then grabbed using the software "gulp", which is similar to >>>> tcpdump. >>>> The problem is occasionally the iBOB seizes up. The "sanity LEDs" go >>>> dark and no data is transmitted. After some about of time, the iBOB >>>> comes back to life and things resume as normal. >>>> >>>> Does anyone have any idea what could cause the iBOB to "go dark" like this? >>>> Thanks, >>>> Laura >>>> >>>> >>> >>> > >
