ULINK: XC16X OCDS INTERFACE DOES NOT WORK

Information in this article applies to:

• ULINK USB-JTAG Adapter
• ULINK2 USB-JTAG Adapter

QUESTION

When I try to download my software to an Infineon XC161, XC164, or XC167 device I get the following error:

JTAG Communication Failure

What is the reason for this problem?

ANSWER

The OCDS interface of your device does not work or is incorrectly connected. Check your hardware for correct pull-up / pull-down resistors on the OCDS pins.

The following configurations disable the OCDS interface on an XC16x device:

• Bootstrap mode on: P20.0 / BSO = 0 when P20.5 / EA = 1 (use on-chip ROM)
• Bootstrap mode on: P0L.4 / BSL = 0 when P20.5 / EA = 0 (using off-chip ROM)
• on XC164: ensure that TRST uses an 100 KOhm pull-down and is correctly connected to ULINK.

On the MCB-XC167 Board make sure that BSO and BSL are off when working with ULINK.

MORE INFORMATION

• Refer to Connector Pinout in the OCDS User's Guide.
• Refer to Target Connectors in the ULINK User's Guide.

SEE ALSO

• ULINK: OCDS: PROGRAM COUNTER MOVES TO INCORRECT VALUES
• ULINK: KEIL*.SYS USB DRIVER UPDATE PROBLEM

Last Reviewed: Sunday, January 28, 2007