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The CC2640 platform supports the cJTAG (two-wire) and JTAG (four-wire) interfaces. Any debuggers that support cJTAG, like the TI XDS100v3 and XDS200, will work natively. Others, like the IAR I-Jet and Segger J-Link can only be used in JTAG mode, but their drivers will inject a cJTAG sequence which enables JTAG mode when connecting.
PS:
若用J-link调试，调试之初会提示无法识别该型芯片，然后我选择Unkown M3类型，下载时提示Failed get CPU status
