Jon Losh wrote: > So I'm interested in taking in a signal from one of the dedicated > SMA clock inputs on the roach, running it through the DCM, and then > out of the GPIO SMA. I specifically want the DCM because I can then > actually lock multiple outputs together. Within the casper toolflow, > there doesn't seem to be any access to these clock inputs besides as > clock sources for the roach. > > From what I understand, I either need to figure out how to make a > yellow block to access these inputs or splice in some verilog of my > own. The verilog part seems somewhat inevitable, as it's really > unclear how I give the DCM directives otherwise. Any ideas on how to > go about doing this?
Hi Jon, I modified the GPIO block to provide the option of using the aux_clk SMAs as inputs. Check commit ccc4f9df in the bwrc fork for details. I'm not sure how you'd route this to the DCM, though. Sounds verilogy. Billy
