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JTAG programming without external clock

Question asked by Pablo Liberman on Feb 9, 2017
Latest reply on Feb 10, 2017 by Pablo Liberman


I'm trying to program a K64F with Cyclone Max via JTAG.

The K64F has a KSZ8081RNA Ethernet controller as an external clock source similar to Freedom board FRDM-K64F.

If the ethernet controller is disable (i.e. it does not generate clock) the K64F couldn't be programmed.

However, if the ethernet controller is enable (i.e. it generates clock) the K64F is programmed right.

So the question is: 

Is it necessary to provide an external clock source to program the K64F via JTAG?


Thanks in advance!