In addition to the USB host interface clock, three fixed-frequency clock oscillators provide reference clocks for various FPGA components and systems.
- Fabric / DDR4 Clock – This is a general-purpose 100 MHz clock for logic use. This clock should be used as the reference for designs using the DDR4 memory.
- MGT Clock – This is an on-board reference for the gigabit transceiver quad on bank 225 refclk 0. Additional clocks may be provided externally for banks 224, 225, and 226 through the MC3 expansion connector.
|CLOCK||FREQUENCY||FPGA Pins (P / N)|
|Fabric / DDR4||100 MHz||J23 / J24 (Bank 66)|
|MGT||125 MHz||V7 / V6 (Bank 225)|