 ULINK®2 User's Guide | |
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Target Connectors
There are five JTAG connectors inside ULINK2. These connectors support various cables required for debugging different targets with ULINK2. 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 16-pin connector for Infineon OCDS (JTAG) targets,
- A 14-pin connector for STMicroelectronics µPSD targets,
- and a 10-pin connector for ARM targets (Mfgr: Don Connex P/N: C42 or Samtec P/N: EHF-105-01-L-D).
Cables for each connector ship with the ULINK2 Standard Product. 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.
ULINK2 Adapter Connectors (cover off)
ULINK2 supports both JTAG and Serial Wire Mode interfaces. Refer to the appropriate pinout diagram for the ULINK2 adapter connectors to make sure they match your target hardware.
JTAG Interface
| Signal | Connects to... |
|---|---|
| TMS | TMS pin — Use 100K Ohm pull-up resistor to VCC. |
| TDO | TDO pin. |
| RTCK | JTAG return clock. |
| 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 — Connect this pin to the (active low) reset input of the target CPU. |
| 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
- Some Philips LPC2000 Devices have special pins (RTCK / DBGSEL) that enable the JTAG interface. For example, on the Philips LPC2129 the signal RTCK must be driven low during RESET to enable the JTAG interface. You may want to add jumpers to your hardware to accomplish this.
Serial Wire Mode Interface
The Serial Wire (SW) mode is a different operating mode for the JTAG port where only the pins TCLK and TDI are used for communication. The TDO pin becomes an optional trace data output. The JTAG pins become SW pins; therefore the debug interface of a typical Cortex-M device can be used either in JTAG or SW mode.
- TCLK is SWCLK (Serial Wire Clock)
- TDI 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-up resistor to VCC. |
| VCC | Positive Supply Voltage — Power supply for JTAG interface drivers. |
| GND | Digital ground. |
| RESET | RSTIN/ pin — Connect this pin to the (active low) reset input of the target CPU. |
Note
- ULINK2 gets its power from the USB connection.
- ULINK2 operates at 3.3V. All JTAG pins are 5V tolerant.
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