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DM814x ADVWROFFTIME in nand timing

Hi,

I need to understand GPMC register values in DM814x.

One of values is ADVWROFFTIME in GPMC_CONFIG3_i.

it set 30 in EVM board.

So, it is 30*GPMC_FCLK = 30 * 10ns

But tALH = 10, tALS = 25 in NAND manual, it means 35ns.

 

Could you explain how to calculate ADVWROFFTIME?

It is not matched with NAND manual.