If you have a multi-CPU configuration in an FPGA such as Nios® II, you would probably use something like Mailbox to communicate between the CPUs, but there are other methods other than using Qsys' Altera Avalon Mailbox (Simple). mosquito?

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If you have a multi-CPU configuration in the FPGA with Nios® II etc., you may use Mailbox etc. to communicate between CPUs, but there is a method other than using Qsys's Altera Avalon Mailbox (Simple) mosquito?

Nios II

Category: Nios® II
Tools: Quartus® Prime / Quartus® II
device:-

There is a way to use Dualport-RAM as a way to achieve a similar function, but there is a difference between polling and interrupts as shown below.
Also, Mailbox can only store 32-bit data, so you can't pass large amounts of information.

・Mailboxes
- Can be used for message (32bit data) exchange between multiple CPUs
- Issue an interrupt when receiving (Polling is also possible)
- About Status register (0x2) Sender can only set (write) and receiver can only clear (read)
- message is limited to 32bit

Reference information
　https://www.altera.com/en_US/pdfs/literature/ug/ug_embedded_ip.pdf
(Search by keyword in Mailbox.)

・Dualport-RAM
- Can be used for data exchange between multiple CPUs
- You have to go get the value yourself on Nios® II (polling only)
- Read-Duaring-Write is Old Data or Don't Care (M20K)
- Set which address is used for what purpose by user specifications (no stipulation on IP)
Reference information
　https://www.altera.com/en_US/pdfs/literature/ug/ug_ram_rom.pdf

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