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TMS570LC4357: Support reverse current

Part Number: TMS570LC4357

Hi team,

Here's an issue from the customer may need your help:

The customer has two 4357 as MC board which backup each other, only one board is powered up and the the other is powered down. And both boards are connected to the circuit of the products.

It is found that the IO of power-down board has weak current reverse, so the customer would like to know if the device supports reverse current protection. 

Could you help check this case? Thanks.

Best Regards,

Cherry