1.2.7. External tristate bridge and external memories

This tutorial uses the external flash and SSRAM on the Cyclone III Starter Board to store application code, variables and data. To use the external memories, the example SOPC system must convert the System Interconnect Fabric's unidirectional data buses to a single tristate data bus for the FPGA IO. This is done by instantiating an external tristate bridge in the design. This bridge also converts the 32-bit System Interconnect Fabric to a 16-bit external data bus. The tristate bridge also includes the logic necessary to buffer and steer the data bytes from/to the external memory.

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