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Hi,
I have the following problem: My FPGA has an input clock CLOCK30. This clock comes from an external transceiver. The clock CLOCK30 is used as the input clock of a PLL which generates a fast clock CLOCK90 whose period is a third (90MHz). For my FPGA controller I need CLOCK90 to be in phase alignment with CLOCK30. CLOCK30 is also used to clock the data into the external transceiver. (clock name at FPGA output pin (CLOCK30_OUT) So how can I manage that CLOCK30_OUT is in phase alignment with CLOCK30 and CLOCK90 ? I am using Altera Cyclone Device with its PLL. The paper "AN251 : Using PLLs in Cyclone Devices" does not show anything about aligning phase relationship of clock input pin, clock at register clock port AND clock output pin" I would appreciate your help. Kind regards ALuPin |
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