Digital clock manager
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A digital clock manager (DCM) is an electronic component available on some FPGAs (notably ones produced by Xilinx). A DCM is useful for manipulating clock signals inside the FPGA, and to avoid clock skew which would introduce errors in the circuit.
Uses of DCM
DCMs have the following applications:
- Multipling or dividing an incoming clock (which can come from outside the FPGA or from a Digital Frequency Syntetizer [DFS]).
- Making sure the clock has a steady duty cycle.
- Adding a phase shift with the additional use of a Delay-locked loop.
- Eliminating clock skew within an FPGA design.
- "Using Digital Clock Managers (DCMs) in Spartan-3 FPGAs" (PDF). 070804 xilinx.com
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