casperites, regarding alec's email appended below:
the serial numbers of roach2 boards that might have the wrong crystal oscillator, range from D01020800 to D01020900 (D010208xx). best wishes, dan On Thu, Feb 27, 2014 at 3:35 AM, Alec Rust <[email protected]> wrote: > Hi all, we have found that an incorrect batch of crystal oscillators were > delivered to Digicom and these made their way onto some ROACH2 boards. The > batch affected is D01020800. > > The oscillator in question is U72, which is the 100 MHz FPGA clock. It is > supposed to be a LVDS output clock, but the incorrect parts are LVPECL. The > FPGA does work but intermittent problems occur. This also causes QDR > read/write errors. > > U72 is between the FPGA and the DDR3 DIMM slot. > > The incorrect part fitted is marked CCPD33. See attached photo of an > example of an incorrect and correct part. There are 2 parts that work: > Crystek CCLD-023-25-100.000 and the part currently shipping on ROACH2 > boards which is the Epson EEG-2121-100.000L. > > Please check your boards and let Mo at Digicom know if you have the > incorrect part fitted. > > Regards > Alec > >
