The 2-bit bus is connected directly to 1A1 and 1A2 on the SN74CBT3383C, which essentially combines in the bus controller to form a single input or split bus bits. When BE is low and BX is low, the selected bus uses 1A1 and 1B1 as inputs and outputs. This means that Device 1 is connected to the bus controller and Device 2 is connected to Device 3 when BE is low and BX is low. While keeping BE low and BX high, communication is enabled from the bus controller to Device 2 and from Device 1 to Device 3. This setup is especially useful when two controllers or devices need to share the same data from Device 1 and Device 2 and the bus addresses are limited or hard coded.

The 0.1-μF capacitor on V_CC is a decoupling capacitor and should be placed as close to the device as possible.