While interfacing 10M08SCU169I7G with a MCU using a bidirectional bus, at a particular instant both side are need to set in input state. Does it damage any products when FPGA and MCU pins are both in input state?

Hi Sujisha,

For bidirectional, you can't set both pins to input/output.

Only one side should drive the line at any given sample time

don't turn on the output-enable(FPGA) at the same time that an external driver(MCU) is active.

Example: If both pins set to output. If one device tries to pull high while the other tries to pull low which leads to high current flow, this can quickly build up heat to a level that destroys the IC chip.

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

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Regards

Anand

Hi Sujisha,

As a designer, we need to control the IO Buffer output enable on the FPGA side.

The value of OE determines whether bidirectional pins is an input, feeding in input

, or a tri-state, driving out the value.

Refer below links

https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/design-software/verilog/ver_bidirec.html

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_altiobuf.pdf

Regards

Anand

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