Cyclone4 NIOS can only run at 60M?

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You can add Avalon MM pipeline bridges to increase the fmax. You could put one between the SGDMA masters and the RAM, as an example. Another one before the JTAG debug module in the CPU usually helps too.

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thanks verymuch；

I'll have a try，but i think this could not increase the fmax verymuch, and is there any reference tells about niosii fmax on cyclone4? haven't found any;

another questions is：when I generate the core, it said"time limited, no rbf would be generated"

but how could i know which core is"limited"?