Category:Cortex Debug

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Ulinkpro jtag 10pin swm.gif

Jtag

JTAG Signals Signal Connects to...

  • TMS Test Mode State pin — Use 100K Ohm pull-up resistor to VCC.
  • TDO Test Data Out pin.
  • TDI Test Data In pin — Use 100K Ohm pull-up resistor to VCC.
  • TCLK Test CLocK pin — Use 100K Ohm pull-down resistor to GND.
  • VCC Positive Supply Voltage — Power supply for JTAG interface drivers.
  • GND Digital ground.
  • nRESET nRESET pin — Connect this pin to the (active low) reset input of the target CPU. Use 100K Ohm pull-up resistor to VCC. This is an open-collector/open-drain output.

Serial Wire

The Serial Wire mode is a different operating mode for the JTAG port, where only two pins are used for the communication. A third pin can be used optionally to trace data. JTAG pins and SW pins are shared.

  • TCLK is SWCLK (Serial Wire Clock)
  • TMS is SWDIO (Serial Wire debug Data Input/Output)
  • TDO is SWO (Serial Wire trace Output)

Signal Connects to...

  • SWDIO Data I/O pin. Use 100K Ohm pull-up resistor to VCC.
  • SWO Optional trace output pin.
  • SWCLK Clock pin. Use 100K Ohm pull-down resistor to GND.
  • VCC Positive Supply Voltage — Power supply for JTAG interface drivers.
  • GND Digital ground.
  • nRESET nRESET pin — Connect this pin to the (active low) reset input of the target CPU. Use 100K Ohm pull-up resistor to VCC. This is an open-collector/open-drain output.

Reference

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