Patent ID: 6011387
Filing Date: 2000-01-04
Classification: G01R

Abstract:
Apparatus for routing test data to and from a circuit that is at least partly analog, the apparatus comprisinga. a plurality of switches, each switch having at least the following inputs and outputsa first input;a second control input;a bidirectional test port;an output;b. control means for controlling each switch to assume a state, the possible states of each switch including at least the following:a first state for routing data from the first input to the output;a second state for routing data from the first input to the bidirectional test port;a third state for routing data from the bidirectional test port to the output;c. at least a first one of the plurality of switches being disposed with its output coupled to a respective input of the circuit, so that during testingthe first state of the first one of the switches simulates a non-test operation of the respective input,the second state of the first one of the switches routes data intended for the respective input to a test bus; andthe third state of the first one of the switches routes test data from the test bus to the respective input.