Hi,
I want to readout a large array of floats from an XMC4400-512. With Infineon DAVE/Eclipse this is super slow so I tried to read the memory with J-Mem. But the problem is, that this alters the data at some addresses.

I want to read from 0x1FFFCE68 to 0x20001C87 (=5000 floats)

I suspend the debug session in DAVE to look at the memory, data looks fine.

Then I connect with J-Mem and read the memory range, but now the data form

0x20000000 to 0x20000090 gets overwritten with:


20000000 051780C1 65C9A012 2000040A 0000000B
20000010 00080001 FFFFFFFF FFFFFFFF FFFFFFFF
20000020 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000030 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000040 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000050 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000060 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000070 FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
20000080 FFFFFFFF 00030949 0003090C 0003090B
20000090 00000000


I’m using J-Link V7.60f and tried with XMC-Link and j-link Ultra+

Memory Map of XMC4400:
...
1FFFC000 1FFFFFFF PSRAM (code)
20000000 20007FFF DSRAM1 (system)
20008000 2000FFFF DSRAM2 (comm)
...

I just found the reason. This happens when I connect to target with J-Mem. If I first connect with J-Mem and then start my debug session, I can break, readout with J-Mem and continue with no change in data.