I am looking for some help in regards to a 20 MHz modulation clock that needs to set the timing in the Virtex_II_Pro. I was investigating running the modulation clock into a DCM; However, the minimum input frecquency for CLKIN is 24MHz. The 20 MHz modulation clock needs to establish the timing in the FPGA for synchronizing the 80MHz ADC and for digital mixing of the modulation frequency. If I can not use a DCM, how do I create the synchronous timing for my subsystems 80MHz and digital mixing?
18 years ago