ADC1256 not responding

< I am using 8 ADS1256 adc's in a board and through FPGA reading the output to microcontroller on multiplexing basis

but whatever command I give ADC gives output as 00 even no data is coming on DOUT pin.

even I am not able to read configuration registers
> <please give some hints to solve this problem>

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  • Are you using a real 80C251 chip, or is it a "soft" core within the FPGA?

    Is it really a '251, or is actually just a '51 or '52?

    Especially if it's a "soft" core, are you sure that the processor itself is correctly configured and working?
    eg, have you done the basic LED flash and "Hello, World"?

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  • Are you using a real 80C251 chip, or is it a "soft" core within the FPGA?

    Is it really a '251, or is actually just a '51 or '52?

    Especially if it's a "soft" core, are you sure that the processor itself is correctly configured and working?
    eg, have you done the basic LED flash and "Hello, World"?

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