Create IRQ pin

[Altera_Forum]

On my design i have 2 processor, and i need to make for every one 2 pin( 1 input and one output). And relate the output for CPU1 with input for CPU2, also the iput from the CPU 1 with output from CPU2.  

 My problem how can i relate with these pin as i mentionned.

[Altera_Forum]

I presume your processors are Nios, then you can easily do it with PIOs. 

One processor drives a PIO output which is connected to a PIO input (and possibly an IRQ) on the other processor. Same for signaling in the opposite direction. This requires you connect PIOs externally to your sopc/Qsys module. I think you could also make everything inside the module, if your cpu1 directly asserts the irq signal for irq2 and viceversa, but I don't know if this is easy to implement: probably you need to define a custom component which is capable to assert irqs.

[Altera_Forum]

Thank you for your reply; 

I create 4 pio 2 input and 2 output as mentionned on the attached file.    --- Quote Start ---  This requires you connect PIOs externally to your sopc/Qsys module.  --- Quote End ---   My problem is here is how can i connect the pin externally as you said

[Altera_Forum]

If you instantiate the system in a schematic, connect outputs to inputs with a wire. If you instantiate in HDL, write the assignement code for PIO port signals. 

 I was thinking now that probably you can make everything inside sopc system, using only two PIOs, bidirectional, 1 bit wide. Each PIO is written by one cpu (as output) and read (as input and/or IRQ) by the other cpu. You have to try; I've never done something like this, so I'm not sure it iwill work.

[Altera_Forum]

--- Quote Start ---  If you instantiate the system in a schematic, connect outputs to inputs with a wire. If you instantiate in HDL, write the assignement code for PIO port signals.  --- Quote End ---  Ok i will try to release it but can you give me an example code assignement, because whem i try to assigne the output and input to the same pin assignement, there are a code error that isn't possible to connect two pin the same pin assignement.

[Altera_Forum]

Verilog: 

wire signal_cpu2_to_cpu1; wire signal_cpu1_to_cpu2; Nios_system inst1( .clk(your_clock), .reset_n(your_reset), .... .in_port_to_the_cpu1_pio_in(signal_cpu2_to_cpu1), .in_port_to_the_cpu2_pio_in(signal_cpu1_to_cpu2), .out_port_from_the_cpu1_pio_out(signal_cpu1_to_cpu2), .out_port_from_the_cpu2_pio_out(signal_cpu2_to_cpu1), .... );   VHDL: SIGNAL signal_cpu1_to_cpu2 : STD_LOGIC; SIGNAL signal_cpu2_to_cpu1 : STD_LOGIC; COMPONENT Nios_system PORT ( clk : IN std_logic; reset_n : IN std_logic; .... in_port_to_the_cpu1_pio_in : IN std_logic; in_port_to_the_cpu2_pio_in : IN std_logic; out_port_from_the_cpu1_pio_out : OUT std_logic; out_port_from_the_cpu2_pio_out : OUT std_logic; .... ); END COMPONENT; inst1 : Nios_system PORT MAP ( clk >= your_clk, reset_n >= your_reset, .... in_port_to_the_cpu1_pio_in >= signal_cpu2_to_cpu1; in_port_to_the_cpu2_pio_in >= signal_cpu1_to_cpu2; out_port_from_the_cpu1_pio_out >= signal_cpu1_to_cpu2; out_port_from_the_cpu2_pio_out >= signal_cpu2_to_cpu1; );

[Altera_Forum]

Thank you very much. 

Now i will try to implement.

[Altera_Forum]

--- Quote Start ---  Verilog: wire signal_cpu2_to_cpu1; wire signal_cpu1_to_cpu2; Nios_system inst1( .clk(your_clock), .reset_n(your_reset), .... .in_port_to_the_cpu1_pio_in(signal_cpu2_to_cpu1), .in_port_to_the_cpu2_pio_in(signal_cpu1_to_cpu2), .out_port_from_the_cpu1_pio_out(signal_cpu1_to_cpu2), .out_port_from_the_cpu2_pio_out(signal_cpu2_to_cpu1), .... ); VHDL: SIGNAL signal_cpu1_to_cpu2 : STD_LOGIC; SIGNAL signal_cpu2_to_cpu1 : STD_LOGIC; COMPONENT Nios_system PORT ( clk : IN std_logic; reset_n : IN std_logic; .... in_port_to_the_cpu1_pio_in : IN std_logic; in_port_to_the_cpu2_pio_in : IN std_logic; out_port_from_the_cpu1_pio_out : OUT std_logic; out_port_from_the_cpu2_pio_out : OUT std_logic; .... ); END COMPONENT; inst1 : Nios_system PORT MAP ( clk >= your_clk, reset_n >= your_reset, .... in_port_to_the_cpu1_pio_in >= signal_cpu2_to_cpu1; in_port_to_the_cpu2_pio_in >= signal_cpu1_to_cpu2; out_port_from_the_cpu1_pio_out >= signal_cpu1_to_cpu2; out_port_from_the_cpu2_pio_out >= signal_cpu2_to_cpu1; );  --- Quote End ---   It work cris72 thank you.