AR# 5214

描述

General Description:

Does the LogiCORE interface support interrupts?

解决方案

The LogiCORE interface supports the interrupt A (INTA-O). INTA_O is an open-drain output and should be driven by a flip-flop. The

flip-flop is cleared by the interrupt handling routine. The use of this signal is optional.

A signal called INTR_N signals an interrupt request from the user application. (Active Low.) This generates an interrupt request (INTA_O) on the PCI bus.

The INTR_N signal should be driven by an FDPE flip-flop (preset on power-up). This flip-flop should be loaded Low to assert the INTA_O signal, and cleared (set) by the interrupt handling software.