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An External Bus Interface (EBI) is used to share I/O pins controlling one or more memory devices that are connected to two different memory controllers. This allows to reduce the total system pin count, and thus the system cost.As shown in Fig. 1 below, both address and data busses can be shared between memory controllers while Chip Select signals are not shared, since they are used to select devices. Depending on the application, all other control pins can also be shared.
Both arbitration & handshake processes are very classical. Refer to the datasheet for more details.
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