Hi, I am using keil uvision3 with ULINK2 adaptor. I am using 10 pin connector from ULINK2 to my PCB. I have checked the connections for JTDI,JTDO,JTMS,JTCK,JTRST,VCC & GND. 3.3v supply is generated on my PCB. supply to the JTAG is provided by Target board. when i try to download to flash;i get error message "CAN NOT ACCESS MEMORY". i want to debug this error message. Let me know what should be the voltage levels at JTAG connector,so that i will be sured that this is hardware problem or software problem. Thanks Mohan