Quartus II - SignalTap II Getting the Period of Sampled Data
No, you can't do that.

SignalTap is a synchronous logic analyzer only, which means that it uses clock(s) inside the FPGA to do the data sampling. There's no independent timebase that you can use as a reference to measure time intervals or frequencies directly.

However, you have a couple of options.


You could feed your FPGA clock (or a divided-down version of it) to an output pin, and then measure the frequency with a counter or oscilloscope.
You could feed a signal with a known frequency into the FPGA and then capture that signal with SignalTap. When you figure out the period in terms of SignalTap samples, you can derive the SignalTap sample rate by multiplying the period by the known frequency of the input signal.