Clock Pins for XC4010XL-PC84 FPGA
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Only a small subset of input pins may be used for direct connection
to flip-flop clock inputs. The hardware synthesizer automatically chooses
the dedicated clock distribution networks for flip-flop clocks, and these
networks only connect to eight pins on the FPGA.

The global clock (GCK) pins are:

GCK 1 - Pin 13
GCK 2 - Pin 29
GCK 3 - Pin 35
GCK 4 - Pin 51
GCK 5 - Pin 57
GCK 6 - Pin 72
GCK 7 - Pin 78 
GCK 8 - Pin 10