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Target Connectors

There are four JTAG connectors on the ULINK board. These connectors support various cables required for debugging different targets with ULINK. The connectors provided are:

  • A narrow (2.00mm/0.079") pin spacing) 20-pin connector for ARM targets,
  • A standard (2.54mm/0.1") 20-pin connector for ARM targets,
  • A 14-pin connector for STMicroelectronics µPSD targets,
  • and A 16-pin connector for Infineon OCDS (JTAG) targets.

Four cables ship with the ULINK Standard Product, one for each connector. If you must change cables, make certain you line up the marker stripe on the cable with pin 1 on the connector. Pin 1 is labeled on the board.

ULINK Adapter Target Cables

ULINK Adapter Connectors (cover off)

Refer to the following pinout diagrams for the ULINK adapter connectors to make sure they match your target hardware.

ULINK Interface Diagrams

Signal Connects to...
TMS TMS pin — Use 100K Ohm pull-up resistor to VCC.
TDO TDO pin.
RTCK Not used on KEIL ULINK.
TDI TDI pin — Use 100KOhm pull-up resistor to VCC.
TRST TRST/ pin — Use 100K Ohm pull-up resistor to VCC. TRST is optional and not available on some devices. You may leave it unconnected.
TCLK TCLK pin — Use 100K Ohm pull-up resistor to VCC.
VCC Positive Supply Voltage — Power supply for JTAG interface drivers.
GND Digital ground.
RESET RSTIN/ pin — Use 100K Ohm pull-up resistor to VCC.
CPUCLK CPU clock (according IEEE Standard 1149.1).
OCDSE Enable/Disable OCDS interface (Infineon-specific).
TRAP Trap condition (Infineon-specific).
BRKIN Hardware break in (Infineon-specific).
BRKOUT Hardware break out (Infineon-specific).
/JEN JTAG Enable (STMicroelectronics specific).
TSTAT JTAG ISP Status (STMicroelectronics specific) (optional).
/RST Chip reset (STMicroelectronics specific).
/TERR JTAG ISP Error (STMicroelectronics specific) (optional).

Note

  • ULINK gets its power from the USB connection.
  • Refer to your target hardware documentation to determine its power requirements.
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