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i assume that u connect a crystal external to the chip .... so if ur chip doesn'nt wrk at say 40Mhz, then reduce the frequency by using a lesser value crystal ... say 20Mhz .....
this method can be used if u use a crystal connected externally .. this avoids "re-spin" of the chip !!!
case2: if u r usin a "clk osc" IP blk
In this case, u have to replace the existing IP by a another one which is of lesser freq.
This case requires a "re-spin" of ur design & does'nt cost u so much if u wer to go for a complete re-spin of ur chip !!!