Part Number: TMS320F28069M
Tool/software: Code Composer Studio
Hello,
I use a custom board with TMS320 28069M on it and XDS110 usb probe for debugging and programming.
when I tested the connection, I got the error message: SC_ERR_PATH_BROKEN.
I checked on the forum and JTAG documentation and I found that t2 cause are possible:
1- pull down resistor to nTRST is too low (I changed and nothing change)
2- short in the circuit (I check the circuit and there is no short)
I also change the targetconfiguration to run at lower frequency but not effective...
On point I noticed is:
using a scope and running the communication test, the voltage on nTRST don t jump to 3.3V but only from 0.0V to 20mV.
On my pin, I have a 10kOhm pull dowm resistor between nTRST and GND.
Using a ohmeter, I measured 2.9Ohms between GND and nTRST pin (instead of my 10k resistor).
I think that it could explain the low reset voltage and error during test.
Could you help me to solve my JTAG issue with these details?