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DDC316: Can not write configuration file

Part Number: DDC316

Hello,

I am trying to interface DDC316 with FPGA. I am using spartan 3 FPGA board. I have set the clk frequency 40 MHZ and conversion time 20 us. After configuring the configure resistor through Din_CFG pin, Dvalid is still high.  

has any idea what is going wrong.

Regards

Santu