Sir Thanks for your response . Actually i found the issue which was causing the above problem. Actually my controller outputs 0 to 3 volts and i needed to operate the ADC at 5 volt supply so i used 1k pullups for communicating between the two. Some how the boards i received earlier communicated with that setup . Never giving me any trouble . But these newer ones did not. So now i have used by-directional logic level converters in between and everything is back to NORMAL probably even better then the previous setup. Hope any one facing same type of problem with SPI communication will find this thread helpful. Anuj Bij
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