enigma Posted July 4, 2012 Report Share Posted July 4, 2012 Hi, I would like to know how many DCMs can be added to the papilio, and can the DCMs always only drive global clock pins? I want to generate a few clocks and not use a state machine to generate them. Regards Enigma Link to comment Share on other sites More sharing options...
Jack Gassett Posted July 4, 2012 Report Share Posted July 4, 2012 Hello Enigma, The Spartan 3E has 4 DCM's, and each DCM is able to do a: -Divided clock -Doubled clock -Custom speed (FX) clock DCM's need to be driven by a global clock, but the output of a DCM does not need to be a global clock. DCM's output can go to any pin of the FPGA, or to any internal logic. Thanks! Jack. Link to comment Share on other sites More sharing options...
Wicked Minds Electronics Posted July 4, 2012 Report Share Posted July 4, 2012 Don't forget the phase shifted outputs I currently use a single DCM to drive: CLKX2 - 64MHz picoBlazeCLK0 - 32MHz pixel counterCLKDV2 - 16MHz Servo PWMCLKFX - 24MHz camera, uart, i2cWorks like a charm Don't forget when using multiple DCMs to link their Locked/Reset I/Os with Inverters for stability. Link to comment Share on other sites More sharing options...
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