Rocket IO failure after power cycle.

In the system I work on, we use Rocket IO to communication between the different boards. I see some Rocket IO failures after power up, so I wrote some scripts to do power cycle testing to charaterize the problem. I see Rocket IO communication failures after power cycle in about

3-5% of time. On some system the failures rate can be as high as 40% of time. With this particular system, the failures seem to related to how long I power down the system.

When I power down the system for 1, 5 seconds between bootup, I see very few failures 3-5%. When I set the power down->up time to 20, 60 seconds, I see the failure rate go up to 40% to 50% very consistently.

Once the Rocket IO enters this failurs state, the only way to recover is to power cycle the system. Reload the FPGA bit file from the sysace did not help at all.

When it fails, the serial/parallel loopback on the failure board works fine, our HW engineer probe the RX of the failed channel and the signal looks ok (signals are clean and no issue.)

Anyone see this kind of problem before? Any pointers on what direction to look and any idea on how one might recover from it.

Thanks in advance.

-Tony

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tony.p.lee
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Marko

Marko napisa?(a):

Marko napisa??(a):

And look at power supply voltage behavior on digital scope.

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furia
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Jerzy Gbur

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