fmcomms2 with FDD ENABLE/TXNRX Pin control

Hi

I am using fmcomms2 and zc702 with NO-OS driver.

I want to using the FDD ENABLE/TXNRX Pin control mode .

I change the ensm_enable_txnrx_control_enable to 1 and the enable to 1.

But the TX can't get nothing.

what can I do to solve the problem?

Thanks

Yang