ULINK: JTAG COMMUNICATION ERROR ON ARM

Information in this article applies to:

• ULINK USB-JTAG Adapter
• ULINK2 USB-JTAG Adapter
• Development Tools for ARM

QUESTION

I am using an STR71x device. When I display external memory in the µVision Debugger using the ULINK JTAG debugger I get the following error message:

JTAG Communication Failure

What can be the reason?

ANSWER

This error appears when the BUS cannot be addressed. The STR7 ARM devices from STMicroelectronic allow you to disable the BUS system using the RCCU registers. For example, the following statement disables the external BUS system:

RCCU_PER = 0;

MORE INFORMATION

• STMicroelectronics data sheets
• Refer to Reset Sequence in the ULINK® User's Guide.

SEE ALSO

• ARM: PROGRAM OFF-CHIP FLASH ROM ON STR71X
• ULINK: RECOVER STR71X WHEN JTAG DISABLE

Last Reviewed: Sunday, January 28, 2007