Noise on TX1_1 on power up

#1

Hello,
Not sure if its just my board, but I am seeing continuous random noise on TX1_1 on power up. The noise peaks to about 2 volts peak to peak and is only a few cycles long, then it goes quite for random period and then repeats.
The board I have is v1.4s and has the following firmware versions. Firmware: 3, Hardware: 4, Protocol: 1, Gateware: 2, Gateware rev: 8
I do not see any noise on the other TX ports.
The noise seams to stop once the driver connects to it.

Noise 1

Close up of noise pulse
Noise 2

Has any one else seen this noise or is it just my board?

#2

So after all this time I am still seeing this noise. It is only present on first power up and once a self test is run or the device is run the noise is no long on the tx ports.
The board I have is v1.4s and has the following firmware versions. Firmware: 4, Hardware: 4, Protocol: 1, Gateware: 2.20
Since the first post of this bug I now see it on TX2_1.

TX1_1 Time domain
TX1_1_time
TX1_1 Frequency domain
TX1_1_spec

TX2_1 Time domain
TX2_1_time
TX1_1 Frequency domain
TX2_1_spec

I don’t believe this is a fault with my board as the behaviour changes with software state.

Has any one else experienced this bug?