Author Topic: JTAG - Tag Connect doesn't require JTDI?  (Read 2055 times)

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Offline roogadgetTopic starter

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JTAG - Tag Connect doesn't require JTDI?
« on: September 26, 2018, 05:54:48 am »
http://www.tag-connect.com/tag-connect-pinout-specifications

I am using the tag-connect 6 pin and it does not use the JTDI. Can JTAG work without the JTDI input though?
I can't find any resources on it  |O
 

Offline Jeroen3

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Re: JTAG - Tag Connect doesn't require JTDI?
« Reply #1 on: September 26, 2018, 07:14:10 am »
JTAG cannot, but ARM Serial Wire Debug, Microchip ICSP, Silabs C2 or AVR ISP uses a lot less pins and often shares the JTAG pins on the chip.

Minimum is 3 pins, ground, clock and data.
Often its 4 pins, including Vdd sense (for logic level converters)
Or 5, some chips also need RESET.
 

Offline AndyC_772

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Re: JTAG - Tag Connect doesn't require JTDI?
« Reply #2 on: September 26, 2018, 07:33:05 am »
Tag-connect is just a cable and connector; you can wire it up however you like.

The pinout they're suggesting is for Microchip PIC, which uses a proprietary 6 pin debug interface that's nothing to do with JTAG.


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