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Hello to al, The system is built on the Zybo board in standalone mode. So far I had success sending interrupts from PL via GPIO. In order to reduce complexity I decided to try sending interrupts directly as it is shown on the included diagram. The RTL module is a simple counter sending a pulse once in a period of time. ILA confirmed the pulse. The application is supposed to count 50 interrupt events and quit. However, no triggering is happening. Clock freq is 50 MHz and a counter is 16 bit. The C-code is taken from two sources: Xilinx Timer-interrupt example and Avnet interrupt tutorial controlling brightness with PWM. The issue in my opinion is that I can't find the parameter called INTERRUPT_ID. The file xparameter.h has nothing related to IRQ interrupt or anything else related to the INTERRUPT_ID or INTC_ID. Below is the last used C-code snapshot. #include <stdio.h> #include "platform.h" #include "xparameters.h" #include "xscugic.h" #include "xil_printf.h" #include "xil_exception.h" #define INTC_INTERRUPT_ID 84 // IRQ [0] #define INTC XScuGic #define INTC_HANDLER XScuGic_InterruptHandler #define INTC_DEVICE_ID XPAR_PS7_SCUGIC_0_DEVICE_ID // =0 static INTC Intc; unsigned int LED = 0; // Interrupt counter void PIsr(void *InstancePtr){ // INTERRUPT SERVICE ROUTINE(ISR) LED ++; } int SetupInterruptSystem() { int result; XScuGic *IntcInstancePtr = &Intc; XScuGic_Config *IntcConfig; IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID); if (IntcConfig == NULL) { return XST_FAILURE; } result = XScuGic_CfgInitialize(IntcInstancePtr, IntcConfig, IntcConfig->CpuBaseAddress); if (result != XST_SUCCESS) { return XST_FAILURE; } /* Connect the interrupt handler */ result = XScuGic_Connect(IntcInstancePtr, INTC_INTERRUPT_ID, (Xil_ExceptionHandler) PIsr, 0); if (result != XST_SUCCESS) { return result; } /* Enable the interrupt for the controller device. */ XScuGic_Enable(IntcInstancePtr, INTC_INTERRUPT_ID); Xil_ExceptionInit(); Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT, (Xil_ExceptionHandler)INTC_HANDLER, IntcInstancePtr); Xil_ExceptionEnable(); /* Enable non-critical exceptions */ return XST_SUCCESS; } int main(void) { int status = XST_SUCCESS; xil_printf("\nLED=%d\n",LED); status = SetupInterruptSystem(); if (status != XST_SUCCESS) { return XST_FAILURE; } while (LED < 50) { } xil_printf("LED=%d",LED); return 0; } Hope someone could share insights and educate me. Thank you very much!