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ad7768-1 FIR Decimation 32-64 not working

Category: Software
Product Number: ad7768-1
Software Version: -

Dear Team

We are working on this chip and can happily use any decimation rates with sinc5 and sinc3 filters applied.

Only FIR doesnt work with 32 and 64 decimations , it starts working with 128 decimation resulting in a 64ksps rate.

FIR 128 OK !

FIR 64 not ok no answer , RDY not falling

FIR 32 no ok .. same thing no answer

Any hints why it doesnt answer ?? ...

Remark , we use the SPI reset with 1 high and 63 zeros at the beginning