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devices on JTAG chain on H563

mete
Senior

I see this: (on NUCLEO-H563ZI board)

 

JTAG chain detection found 2 devices:
#0 Id: 0x6BA00477, IRLen: 04, CoreSight JTAG-DP
#1 Id: 0x06484041, IRLen: 05, Unknown device

 

What is the device #1 ?

1 REPLY 1
STOne-32
ST Employee

Dear @mete ,

Indeed,  Most of STM32F MCUs integrate two serially connected JTAG TAPs, the boundary scan TAP (IR is 5-bit wide) and the Cortex-M3/4/M7/M33 TAP (IR is 4-bit wide).

For debug the boundary scan tap should be put in bypass mode and vis versa in case if boundary scan of I/O is used the cortex TAP one ( 4-bit wide) . 

Ciao ,

STOne-32