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If our goal is to make a LED to blink (from PL in Zynq Device), then the safest way is to use FPGA Configuration Master Clock this clock is always available and accessible in the same way, we do not need to know any specifics to the board we have and we do not depend on PS init done by FSBL.
ZYNQ MPSoC Devices
This design blinks a LED connected to DONE pin and also a VIO Pin, on any Zynq MPSoC device, without using any clocks provided by the externally, and without the use of PS supplied clocks. LED Toggle rate is about 2 Hz.
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