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TMS320DM6435ZWT6: Unexpected signal on CLKX0 at power down

Guru 10085 points

Hi,
Using SPIROM by McBSP0+GPIO in DM6435, there is unexpected signal on CLKX0(H1)
at thw power down. *Power down faveworm.pdf 5482.Power down faveworm.pdf

The status details are as follows.
-Board: Custom board; DM6437x2 and FPGA
-Occurrence frequency: Once or twice in 10 hours Power ON/OFF checks
-Occurrence ratio: 1 of 20 boards
-Power down sequence: Almost at the same time; 3.3-V, 1.8-V I/O and 1.2-V
-POR, Reset signals are normal
-Boot mode: SPI boot

I would like to know the workaround or the check points for this issue.
Any advice would be appreciated.

Regards,
Kanae