Patent ID: 6963212

Claim:
An apparatus, comprising: a semiconductor chip; a first contact site on the semiconductor chip; a dominant driving circuit having a first input and a first output coupled to the first contact site, the first output having a variable drive strength responsive to the first input; a subordinate driving circuit having a second input and a second output coupled to the first contact site, the second output having a variable drive strength responsive to the second input; a test control circuit having a test mode, at least one output coupled to the first input of the first driving circuit, and at least one output coupled to the second input of the second driving circuit, the test control circuit operable in test mode to create a drive fight between the dominant and subordinate driving circuits, and to generate a test value at the first contact site; a second contact site on the semiconductor chip for probing; and a gated signal path connecting the second contact site to the first contact site, operable in test mode to transfer the test value from the first contact site to the second contact site.