The module has a 24 MHz SMD clock oscillator providing a clock source for both the USB microcontroller and the FPGA as detailed in the table below.
Signal | FPGA pin | FPGA ball |
---|---|---|
24MHZ1 | IO_L12P_2(bank 2) | N9 |
The DCMs of the FPGA can be used to synthesize arbitrary clock frequencies from any on-board clock network, differential clock input pair or single-ended clock input. For further reference, please read Xilinx DS485:Digital Clock Manager (DCM) Module and the DCM chapter in Xilinx UG331: Spartan-3 Generation FPGA User Guide.