Importance of DCM (Digital Clock Manager)

•  It’s an open core freely available with Xilinx.
• This is used to implement delay locked loops, digital frequency synthesizers, digital phase shifters and digital spread spectrums.

When implementing the SPI communication, I made use of the DCM core.

Reason for the usage – For the proper communication between the MSR header and the FPGA, we need to have a good clocking throughout the operation. Due to the propagation delays of wire connections in the circuits, exact clocks may not reach the device. To address this issue, we can use the DCM core. Then it will manage proper propagation of clock frequency to the devices.