![]() Some targets must synchronize the JTAG inputs to internal clocks. Return test clock signal from the target. Typically connected to TCK of target CPU. It is recommended that this pin is pulled to a defined state of the target board. Typically connected to TMS of target CPU. This pin should be pulled up on the target. Typically connected to TDI of target CPU. It is recommended that this pin is pulled to a defined state on the target board. This pin is normally pulled HIGH on the target to avoid unintentional resets when there is no connection. Typically connected to nTRST of the target CPU. Output from J-Link to the Reset signal of the target JTAG port. It is reserved for compatibility with other equipment.Ĭonnect to Vdd or leave open in target system. It is normally fed from Vdd of the target board and must not have a series resistor. ![]() It is used to check if the target has power, to create the logic-level reference for the input comparators and to control the output logic levels to the target.
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