January 2002

4.4.2 JTAG

The VIA Eden ESP processor has a JTAG scan interface that is used for test functions and the proprietary Debug Port. However, the VIA Eden ESP does not provide a fully compatible IEEE 1149.1 JTAG function.

From a practical user viewpoint, JTAG does not exist and the associated balls (TCLK, and so forth) should not be used.

4.4.3 DEBUG PORT

Certain processors have a proprietary Debug Port which uses the JTAG scan mechanism to control internal debug features (“probe mode”). These interfaces are not documented and are available (if at all) only under a non-disclosure agreement.

The VIA Eden ESP processor does not have a debug interface.