Apparatus and method for sensing emulator cable orientation while providing signal drive capability

摘要

In a cable electrically coupling a target processor and an emulator/test unit, two sense lines are selected that have corresponding terminals on the connects that are symmetrical under 180° rotation of the connectors. Characteristics of at least one sense line are determined. Based on the characteristics of at least one of the sense lines, the relative orientation of the sense lines can be determined. With this determination, the terminals to which the sense lines are coupled in the target processor can be determined. Signals can be applied to and/or received from at least one sense line. In the preferred embodiment, the sense line coupled to the /TRST JTAG terminal of the target processor can be identified. The characteristics of at least one sense line can determine the signals associate with each cable conductor.