This also depends on the board layout, loads, connectors, jumpers, and switches on the board. ![]() ![]() If a cable drives three or more devices, buffer the JTAG signal at the cable connector to prevent signal deterioration. After this initial buffer at the connector, add buffers as the chain gets longer or whenever the signals cross a board connector. Intel recommends buffering the signals at the connector because cables and board connectors tend to make bad transmission lines and introduce noise to the signals. You might have to add buffers to a JTAG chain, depending on the JTAG signal integrity, especially the TCK signal, because it is the JTAG clock and the fastest switching JTAG signal. If your device is in a configuration chain, ensure all devices in the chain are connected properly. JTAG Signal Buffering Checklist Numberīuffer JTAG signals per the recommendations, especially for connectors or if the cable drives more than three devices.
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