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AD5111 Writing issue


One of my customers is using the AD5111 digital potenziometer.

He has an issue with writing to his egisters

Their tining is according to the figure 3 in the data sheet

The CS is tied to "low" by pull down. During this cycle the CLK is in HIGH

The writing cycle is failed whther they start the U/D# pin from "HIGH" as follows: HIGH-LOW-HIGH-LOW - then the EEPROM programm is not succeeds.

Using the following U/D# cycle the EEPROM programm is performed successfully: LOW-HIGH-LOW .

I can't see any limitations for it in data sheet.

Do you have any idea why during the HIGH-LOW-HIGH-LOW cycle the writing to the eeprom is failed?