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LMH1297: SPI access timing after power up

Part Number: LMH1297

Hi Team,

Can you give me advice on a question on SPI access timing.

When, I tried to modify some register through SPI interface, immediately after power up, I could not modify
the register. Of case I accessed SPI after the DC power was with in recommended operating range.

Referring the SM Bus AC timing specification, I tried it 50 ms after power up, I could modify the register.

Now a question is that do you need to hold SPI access after power up?
If so, how long do you need to hold SPI access after power up?

Mita