Bus Backplane
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The bus backplane distributes power to MCE cards and also provides the data bus which allows inter-card communication. The data bus consist of a multi-drop 'command' line from the master slot (clock card) to all slave cards (readout, address, bias cards) and two point-to-point 'reply' lines from each slave card to the clock card. All JTAG signals are routed on the backplane to form a single JTAG chain that can be used to program all the cards in the MCE. Bypass buffers on the JTAG signals allow programming a partially populated MCE.
