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What is a JTAG? - Electrical Engineering Stack Exchange Additionally, JTAG is sometimes mis-used as a verb meaning, generically, "to debug test" a thing A person "JTAG'ing something" may actually be using a different protocol that the device's manufacturer has overlapped with the physical JTAG pins (i e SWD)
JTAG vs SWD debugging - Electrical Engineering Stack Exchange JTAG (Joint Test Action Group) was designed largely for chip and board testing It is used for boundary scans, checking faults in chips boards in production Debugging and flashing micros was an evolution in its application over time JTAG is in use for multiple microcontroller processor architectures aside from ARM General Discussion
How does STM32 know if Im using SWD or JTAG The MCU expects JTAG signals by default so to use SWD the debug interface needs a current interface reset sequence (more than 50 clocks with data high) and then you send a 16-bit command sequence to transition from JTAG to SWD mode, and send the 50 clocks again to reset the current interface The sequence works so that it does not matter if the MCU was expecting JTAG or already put into SWD
Does there exist a general purpose JTAG communicator? The Virtual JTAG User Guide notes that The Virtual JTAG Intel FPGA IP core Tcl API requires an Intel programming cable Designs that use a custom controller to drive the JTAG chain directly must issue thecorrect JTAG IR DR transactions to target the Virtual JTAG Intel FPGA IP coreinstances
Purpose of a JTAG programmer - Electrical Engineering Stack Exchange Folks like ARM support jtag based debuggers into their products, but their mcu products are now primarily cortex-ms which support SWD instead of JTAG (well SWD is the main use case) which is a different protocol interface