连接ULINK2 扁平电缆接口汇总

eeleader 2010-12-16 17:35 楼主

ULINK2 常见有下面5类扁平电缆接口：

我经常使用的20 PIN interface (2.54mm) 间距的接口。

上面5类JTAG接口管脚定义如下：

管脚信号含义：

TMS	Test Mode State pin — Use 100K Ohm pull-up resistor to VCC.
TDO	Test Data Out pin.
RTCK	JTAG Return Test ClocK. (see Note below)
TDI	Test Data In pin — Use 100K Ohm pull-up resistor to VCC.
TRST	Test ReSeT/ pin — Use 100K Ohm pull-up resistor to VCC. TRST is optional and not available on some devices. You may leave it unconnected.
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.
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

ULINK2 is powered through the USB connection.
ULINK2 operates at 3.3V. All JTAG pins are 5V tolerant.
Usually, devices do not include pull-up or pull-down resistors on JTAG nor SW pins. Resistors should be added externally onto the board. However, do not add resistors when the device includes them already.
Some NXP LPC2000 Devices have special pins (RTCK, DBGSEL) that enable the JTAG interface. For example, on the NXP 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.

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