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Programmable Device

Timing Source

A timing source or Clock is required to make an LED Blink, without reference to time or known Clock source, we can only make LED to be permanently ON or OFF.

If we do not know how to access the time/clock source or if are not sure if the clock is enabled and running we have an potential problem and we can not proceed to the LED Blinky unless we have identified an active/enabled accessible clock source we can use for timing.

FPGA Devices

ZYNQ Devices

ZYNQ MPSoC Devices

Valid I/O Voltage

It is very common that modern Integrated Circuits have separate power supply pins for I/O Voltage. That voltage if applied control the output levels from the device, if the Voltage is too low or missing then it is not possible to have enough current from the device I/O Pin to make a LED Lit.

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