A: There are 3 clocks provided on the AWS F1 Platform. Their names and default frequencies are shown below. Among them, DATA_CLK and KERNEL_CLK can be used by the RTL kernel.

* SYSTEM (clock_main_a0) @ 250 MHz
* DATA_CLK (clock_extra_b0) @ 250 MHz
* KERNEL_CLK (clock_extra_c0) @ 500 MHz

NOTE: Frequency scaling can be enabled by Vitis on the kernel clock (DATA_CLK or KERNEL_CLK). This happens when the kernel's timing performance cannot be achieved. Vitis will lower the clock frequency to meet timing. For more details about kernel clock, please refer to Vitis User Guide.

A: We support creating AFI's from CL's that have been built to work at Frequencies no lower than 80MHz. Re-clocking/Loading a dynamic clock frequency lower than 80MHz will also result in an error.