Hi Tim, [quote userid="630992" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1495687/tms320f28388d-jtag-flashing-with-uniflash-resulting-in-error--6001"]I also dissabled all reset logic connected to XRS_N. Here I measured a weird pulse every 25ms or something. This was not measured on the old design that is flashable (constant 3.3V). I tried pulling this pulse up to 3.3V to make sure it's not noise with a 10Ohm resistor. This result can be seen in the attached picture.[/quote] Please do not pull XRSn to 3.3V with such a small resistor. This could potentially damage the device. If the device tries to pull XRSn low through a 10Ohm resistor, it will result in a dangerously high current. Please follow datasheet guidelines for the reset circuit: The periodic reset on the XRSn pin is expected for unprogrammed MCUs when they are booting to FLASH. It is caused by the watchdog, and it will not affect your ability to program the device. [quote userid="630992" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1495687/tms320f28388d-jtag-flashing-with-uniflash-resulting-in-error--6001"] [4/1/2025, 3:48:12 PM] [ERROR] C28xx_CPU1: Error connecting to the target: (Error -6001) Internal Error: PRSC module detected an unknown failure. (Emulation package 20.1.0.3372) [/quote] I think it will be easier to debug if you can use Code Composer Studio and do the 'Test Connection' operation. Details can be found in this app note: https://www.ti.com/lit/pdf/spracf0 Best Regards, Ben Collier
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