I've got little problem with reading data from AD7658. I am using it in hardware and parallel mode. After power up, sending pulse signal to reset pin (with CONVST X high) and the high-to-low CONVST edge followed by a low-to-high CONVST edge, I set CS low.
After that I oscillate with RD to get data
0 first valid data
0 second valid data
0 third valid data
then CS go up, CONVST down and up to start next conversion.
Attached image show what I mean.
V1-V6 are all connected to the same voltage.
Problem is that why data read from V4, V5 and V6 contains only zeros?
I would be very thankful if you can help me to solve this problem.