Passive serial Configuration Issue

Hello All,

We are using Analog devices DSP Blackfin BF561 to configure the Stratix III EP3SL200 in passive serial mode. But some how the nSTATUS is going low after 65000 cycles. The configuration clock frequency is 4MHz. We are following all the procedure given in the datasheets like sending LSB first and other things. Also we have checked the signal integrity this also seems to be fine. Has any one faced same kind of issue . If we directly configure the FPGA in PS mode through the configuration header through USB blaster it is happening fine.Can any one give me some inputs to solve this issue.

Thanks in advance.

Thanks and regards

Anil