NIOS II SPI Slave with FIFO

Hi,

I would like to receive N bytes of data using SPI(3 Wire Serial) IP in Qsys.

All N bytes are transferred by the master during one chipset toggle.

I implemented the RX interrupt, but I could see only the last byte.

(Previously received data is overwritten)

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So, I think I need a FIFO that can store the received data.

But ​I do not know what to do.

Can somebody give me an advice?

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Thank You.