XRT-managed RTL kernels can optionally have an interrupt port containing a single interrupt. The port name must be called
interrupt and be active-High. It is enabled when
both the global interrupt enable (GIE) and interrupt
enable register (IER) bits are asserted in the Control
Register block.
The Vitis compiler (v++) will link the interrupt signal of a PL kernel into the available
signals on the platform, provided the platform has interrupts available for connection
as described in
Adding Hardware
Interfaces in the Embedded Design Development Using Vitis
(UG1701). If no interrupt is
enabled on the platform, then you must manually connect the interrupt of the kernel.
By default, the IER uses the internal ap_done signal to trigger an interrupt. Further, the interrupt is cleared
only when writing a 1 to bit-0 of the IP Interrupt Status Register.
This logic should be reflected in the Verilog code for the RTL kernel, and
also in the associated component.xml and kernel.xml files. The kernel.xml file is stored inside the kernel.xo file and is generated automatically when using the package_xo command or RTL Kernel Wizard.