Electronics > Beginners
JTAG - Tag Connect doesn't require JTDI?
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roogadget:
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
Jeroen3:
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.
AndyC_772:
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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