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JTAG TAP controller TDO pin

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sunidrak

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I am working on JTAG TAP controller in which TDO pin is a tri state . What is the advantage of Tri state TDO pin in TAP controller plz expalin I need badly
 

maybe to allow bypassing a faulty part in a JTAG chain to allow further testing comes to mind. Then you can jumper TDI to TDO of that part if it's not working correctly.
 

sunidrak said:
I am working on JTAG TAP controller in which TDO pin is a tri state . What is the advantage of Tri state TDO pin in TAP controller plz expalin I need badly
Click to expand...

You can drive multiple taps and have them share to TDO pin. You do need to be able to select one tap at a time.


John Eaton
 
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