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LMX2594: phase shifting

Part Number: LMX2594

Hi Team, 

Good day. I am posting this inquiry on behalf of the customer.

"As I read in the datasheet, it should work by changing the value of MASH_SEED to shift the phase of the output signal in my case. The settings in the TICS Pro software are shown in Fig. 1 and Fig. 2. I used two LMX2594 to test phase shifting. The output signals of two LMX2594 are connected to an oscilloscope, as shown in Fig. 3. When I changed MASH_SEED from 1000 to 400 (Fig. 4), the phase difference between the two signals does not change (Fig. 5). It was all the same for any value of MASH_SEED. However, when I changed the value of PFD_DLY_SEL, the phase difference changed. 

Could you please tell me why phase shifting does not work when I changed MASH_SEED? Many thanks."

Please help to advise.

Kind regards, 

Marvin