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DS90UB949-Q1EVM: Change I2C speed

Part Number: DS90UB949-Q1EVM

Hi experts, 

My customer are developing by using our EVM and their circuit.

They want to change I2C speed to 400kHz, which register do they change to?

They tryed to change 0x18h/0x19h, but it doesn't change speed.

Regards,

Youhei MIYAOKA