jlink无法连接6750evk2板子是什么原因？如何解决?

板子型号 6750evk2
使用jlinkv11 链接板子后，jlink 亮起红灯，在ses中报错如下：
Connecting ‘J-Link’ using ‘USB’
Loaded C:/Program Files/SEGGER/SEGGER Embedded Studio for RISC-V 7.12a/bin/JLink_x64.dll
Firmware Version: J-Link V11 compiled Mar 15 2023 11:20:48
DLL Version: 7.86e
Hardware Version: V11.00
Target Voltage: 4.889
Device "HPM6750XVMX" selected.
Current Speed: 4000 kHz
Could not measure total IR len. TDO is constant high.
Failed to identify target. Resetting via Reset pin and trying again.
Could not measure total IR len. TDO is constant high.
Target connection has been lost

jlink模式设置为SWD：

报错如下：
Connecting ‘J-Link’ using ‘USB’
Loaded C:/Program Files/SEGGER/SEGGER Embedded Studio for RISC-V 7.12a/bin/JLink_x64.dll
Firmware Version: J-Link V11 compiled Mar 15 2023 11:20:48
DLL Version: 7.86e
Hardware Version: V11.00
Target Voltage: 4.896
Device "HPM6750XVMX" selected.
Current Speed: 4000 kHz
Failed to attach to CPU. Trying connect under reset.
Connect failed. Resetting via Reset pin and trying again.
Failed to connect to target.