Diagnosing identical circuit blocks in data streaming environment

One or more computer-readable media storing computer-executable instructions for causing a computer to perform a method, the method comprising:

• creating a circuit in a circuit design, the circuit comprising:
• a plurality of identical circuit blocks, each of the plurality of identical circuit blocks comprising one or more test output ports, the one or more test output ports being coupled to outputs of scan chains, outputs of one or more test response compactors, or outputs of comparators;
• a first bit-combining device and a second bit-combining device for each of the one or more test output ports for each of the plurality of identical circuit blocks;
• a delay device for each of the one or more test output ports for each of the plurality of identical circuit blocks;
• and
• a first network coupled to each of the plurality of identical circuit blocks and configured to transport a first bit stream and a second bit stream during a test,
• wherein the first bit-combining device is configured to update the first bit stream by combining bits of the first bit stream with bits outputted from the each of the one or more test output ports, and the second bit-combining device is configured to update the second bit stream by combining bits of the second bit stream that are delayed by a preset number of scan clock cycles by the delay device with the bits outputted from the each of the one or more test output ports.