External Jtag, Swd, And Trace; Description; Figure 6. External Debug Tools Connectors - STMicroelectronics STM32H7B3I-EVAL User Manual

6.4

External JTAG, SWD, and trace

6.4.1

Description

There are two basic ways to support an external debug tool. If the user encounters any trouble with the first
procedure, then the second one is mandatory.
1. Keep the embedded STLINK-V3E running. Power on the STLINK-V3E at first until the COM LED lights up red.
Then connect the external debug tool through the CN14, CN15, or CN16 connector.
2. Set the embedded STLINK-V3E in a high‑impedance state. When the STLK NRST jumper (CN19) is ON, the
embedded STLINK-V3E is in the Reset state, and all GPIOs are in high impedance. Then the user can
connect the external debug tool to the debug connector (CN14, CN15, or CN16). Refer to
Note: Depending on the design requirement, the embedded STLINK-V3E hardware might be completely disconnected
if that is required early in the project.
Remarks:
• It is possible to power the board via the embedded STLINK-V3E USB connector (CN21) even if an external
tool is connected to the ETM trace connector (CN15) or the external JTAG and SWD connector (CN14).
• ETM can only work at 50 MHz clock frequency by default because ETM signals are shared with other
peripherals.
UM2662 - Rev 4
Figure 6. External debug tools connectors
UM2662
Hardware layout and configuration
Figure 6.
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