Patent ID: 7752004
Filing Date: 2010-07-06
Classification: G01R

Abstract:
1. A system on a circuit board, said system comprising: a plurality of devices designed to access an electronic system on the circuit board, each of said plurality of devices complying with a test port architecture; and a programmable logic device (PLD) connected to the plurality of devices, said PLD interfacing said plurality of devices with a test port, said PLD being capable of configuring different connectivity among the plurality of devices based on an input control signal, the control signal including a power indication signal indicating the status of a corresponding power supply from among two or more power supplies having differing power supply levels, each power supply providing power to a corresponding group of devices, the control signal including a mode signal and a selection signal to specify a group of one or more devices, limiting activation to ports corresponding to the specified group of devices, said PLD being capable of selecting, device by device, at least one desired device from among the plurality of devices to form a chain of devices having a desired connectivity among the devices.