As all DPU engines work synchronously, all DPU engines generate an interrupt to
signal the completion of a task. A High state on reg_dpu_start or ap_start signals the
start of a DPU task. At the end of the task, the DPU generates an interrupt and bit0
in IPISR, and reg_finish_sts is set to 1.
To support DPU interrupt, the Interrupt Controller module implements the following registers:
- Global Interrupt Enable Register (GIER)
- Provides the master enable/disable for the interrupt output to the processor or Interrupt Controller. See the Global Interrupt Enable Register (GIER) in Table 1 for more details.
- IP Interrupt Enable Register (IPIER)
- Implements the independent interrupt enable bit for each channel. See IP Interrupt Enable (IPIER) and IP Status Registers (IPISR) in Table 1 for more details.
- IP Interrupt Status Register (IPISR)
- Implements the independent interrupt status bit for each channel. The IPISR provides Read and Toggle-On-Write access. The Toggle-On-Write mechanism allows interrupt service routines to clear multiple ISR bits using a single write transaction. The IPISR can also be manually set to generate an interrupt for testing purposes. See IP Interrupt Enable (IPIER) and IP Status Registers (IPISR) in table 2 for more details.
The interrupt should be correctly connected to the IRQ port of the PCIe® controller.