Debug support (DBG) RM0440
2086/2126 RM0440 Rev 4
Figure 686. JTAG TAP connections
47.6 ID codes and locking mechanism
There are several ID codes inside the STM32G4 Series MCUs. ST strongly recommends
tools designers to lock their debuggers using the MCU DEVICE ID code located in the
external PPB memory map at address 0xE0042000.
Boundary scan
TAP
NJTRST
Corte x-M4 TAP
JTMS
TMS nTRSTTMS nTRST
JTDI
JTDO
TDI TDO TDI TDO
SW-DP
STM32 MCU
Selected
IR is 5-bit wide IR is 4-bit wide
ai14981c
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