IBERT acquisition time repeatability for bathtub scans
Dear Xilinx users,
we use ISE 14.5 to make an ibert core on VC707. The loopback is on a mezzanine we made to test avago miniPODs RX and TX. We use 7bit pseudorandom data at 10Gb/s, very close the the MGT maximum capability.
We notice as sweeping over time to make a bathtub plot, the acquisition time on the same MGT with always identical
settings whildly change between 10 minutes up to half an hour.
Identical MGT setting and identical IBERT and sweeping settings.
I cannot figure why is that and any idea would be more than welcome!