A shared custom Instruction between Nios II processors

Hi,

Thank you for your reply. But, could you please explain more what you mean by " alternatively you could simply add a second CI Slave port to your existing IP block and perform the arbitration internally."

You mean that i can made simply an accelerator as custom IP and i make it a dual port peripheral.

Or you mean for a custom instruction, i can associate a vhdl block with two slave ports and then the vhdl block of this custom instruction could be accessed by two CPU?