Sharonoff-
I think your best bet for getting 30Mhz timing is to use the loop timer with FPGA module or the single cycle timed loop. You can find information and examples of thier use in the LabVIEW help
Loop Timer:
http://zone.ni.com/reference/en-XX/help/371599B-01/lvfpga/loop_timer/
Timed Loop:
http://zone.ni.com/reference/en-XX/help/371599B-01/lvfpga/fpga_timed_loop/
Xaq