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Visitor
Visitor
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Registered: ‎01-27-2020

JTAG keeps disconnecting

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Using the below mentioned JTAG cable HS2 from trenz electronics and trying to connect to Zynq7035 is being disconnected every now and then . 

JTAG cable:HS2 Trenz

Clock Freq:125KHz (can this be changed on the above mentioned cable?)

I've seen that this cable has worked at 10MHz previously on the same board, all of sudden I can only recognize the board at 125KHz.

This is the error message I see:

ERROR: [Labtoolstcl 44-513]  HW Target shutdown. Closing target: localhost:3121/xilinx_tcf/Digilent/210249A7306F
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Teacher
Teacher
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Registered: ‎07-09-2009
intermittent problems like this are normally broken / mechanical problem with the cables.
or blown driver chips / power supplies on the board.
or software .

You say this cable has worked at 10 Mhz, has it worked on this machine at that speed ?

At a firs toff, I'd get the scope out, and trace the JTAG signals around the board, to see if they all look nice voltage levels and shape of signal.

As its a digilent programmer , you might want to ask on the digilent forum also
<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>

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Highlighted
Teacher
Teacher
384 Views
Registered: ‎07-09-2009
intermittent problems like this are normally broken / mechanical problem with the cables.
or blown driver chips / power supplies on the board.
or software .

You say this cable has worked at 10 Mhz, has it worked on this machine at that speed ?

At a firs toff, I'd get the scope out, and trace the JTAG signals around the board, to see if they all look nice voltage levels and shape of signal.

As its a digilent programmer , you might want to ask on the digilent forum also
<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>

View solution in original post

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Visitor
Visitor
306 Views
Registered: ‎01-27-2020

Yes, You were right, it was a power supply isssue.

 

Thanks