Hi,
I designed 3rd version of my PCB for s7g2 chip, in the first 2 designs, I could use a few of the pcb's. I had a lot of connection problems with Jlink. I tought that the pcb's are test grade, and they may have some quality problems. at the 3rd design, I ordered the pcb's from a well known manufacturer, and now I am sure that the pcb is what we expected. the problem is still lay in the 3rd pcb. only 2-3 of the 50 samples are working, and unfortunately time to time. I programmed the pcb's inside the e2 studio. and for further details I run Jlink commander, I saw thar the boards can not be accessed, the TDO is constant high message is received. when I dig internet, I saw that some people had this problem, when they supplied Vanalog from Vcc with a 1K resistor, and when they removed the resistor and supplied directly, they solved the problem. At the point I stand, I need some support to find out why the MCU is not accessible via jlink, and why it is time to time accessible? Anybody with some experience ?
Regards
Erkut ERGIL