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Altera_Forum
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18 years ago

switching Bidirectional I/Os in FPGA

Hi, My project requires switching of SDRAM control and data signals between two DSP processors. Well, both the processors have their own SDRAM controller and signals. The Cyclone II FPGA is use...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Yes, you need to drive the output enable for the bidir pins properly. This requires an SDRAM controller (more or less) to be present in the FPGA.

Rather than relying on the SDRAM controllers in the DSPs, you would make things much easier by using a simpler memory interface, like asynchronous SRAM to transfer data to/from FPGA - and implement a state machine + SDRAM controller in the FPGA.