Patent ID: 7228477

Claim:
Test apparatus for testing a circuit unit to be tested, the test apparatus comprising: a) a nominal data production unit for production of a nominal data stream, which can be supplied to the circuit unit to be tested; b) a comparison device for comparison of an actual data stream which is emitted from the circuit unit to be tested as a function of the nominal data stream that is supplied with the nominal data stream; c) a compression device for compression of an intermediate result signal which is emitted from a comparison device as a function of the comparison into a test result signal, wherein the compression device has at least one logic circuit which is in the form of an AND function, such that the test result signal indicates fault-free operation of the circuit unit to be tested only when each of the intermediate result signals indicates fault-free operation of the circuit unit to be tested; and d) a buffer storage device for temporary storage of the intermediate result signal which is emitted from the comparison device, only if the test result signal indicates that the circuit unit to be tested is faulty, e) wherein, the test apparatus further comprises a read unit for reading the intermediate result signal which is temporarily stored in the buffer storage device, wherein the read unit is designed so as to subdivide the intermediate result signal which is temporarily stored in the buffer storage device into separate result blocks.