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TMS320F2808: PLL failure to lock in few devices during production

Part Number: TMS320F2808


Tool/software:

hi,

My customer is using F2808 in volume production. They use a boot code which is configuring PLL to operate at 50MHz - there are no issues with this configuration.

Their application re-configures the PLL to 100Mhz

In few of the boards, they see the code entering into illegal ISR, when the application configures the clock to 100MHz.

The R&D team, when they configure the application enable clock at  80Mhz, they see no issues.

Need help in debugging this issue further.

regards,

Frangline.