Cn1 Debug Connector; Cn1 Stdc14 Debug Connector; Table 14. Stdc14 Connector; Figure 22. Cn1 Stdc14 Debug Connector - STMicroelectronics B-G474E-DPOW1 Manual

Pin
Description
number
B3
B2
B1
14.2

CN1 debug connector

Different debug connectors are used according to Discovery board revisions :
• An STDC14 14-pin connector is soldered on CN1 for BG474EDPOW1$AT1 finish good (Based on MB1428-
G474RE-B01 board revision)
• A MIPI10 10-pin connector is soldered on CN1 for BG474EDPOW1$AT2 finish goods and above (Based on
all other board revisions)
14.2.1

CN1 STDC14 debug connector

The STDC14 debug connector is implemented to program and debug the STM32G474RET6 microcontroller. The
SWD protocol must be used by default.
To use the STDC14 connector to debug STM32G474RET6, it is mandatory to place a jumper on JP6 to connect
STLK NRST to GND. This sets the STLINK-V3E MCU in a high impedance state.
In case the user wants to isolate completely the STDC14 debug connector from STLINK-V3E MCU, SW1 octal
mechanical switch must be set accordingly, and JP7 must be removed. This also disconnects STM32G474RET6
microcontroller from STLINK-V3E.
If needed, a MIPI10 female connector can be plugged into CN1 STDC14 connector, if pins 1, 2, 13, and 14 are
bent or cut. Alternatively, a MIPI10 connector can be soldered on the CN1 footprint in place of STDC14.
Pin
Description
number
1
3
5
7
9
11 GNDDetect
UM2577 - Rev 2
Signal assignment
TX2_N -
TX2_P -
GND GND
Figure 22.
Table 14.
Assignment
- -
3V3 power 3V3
GND GND
KEY GND
- -
100 Ω pull-down
Pin
Description
number
A10 RX2_N
A11 RX2_P
A12 GND
CN1 STDC14 debug connector
STDC14 connector
Pin
Description
number
2
4 SWDIO / JTMS
6 SWCLK / JTCK
8 SWO / JTDO
10 JTDI
12 RESET / JTRST
UM2577
CN1 debug connector
Signal assignment
-
-
GND
Assignment
- -
T_SWDIO (PA13)
T_SWCLK (PA14)
T_SWO (PB3)
T_JTDI (PA15)
T_NRST (PG10)
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