Answers Database
LogiCORE PCI: Does the LogiCORE interface support interrupts?
Record #5214
Product Family: Documentation
Product Line: PCI Apps
Product Part: PCI Frequently Asked Questions
Problem Title:
LogiCORE PCI: Does the LogiCORE interface support interrupts?
Problem Description:
Urgency: Standard
General Description:
Does the LogiCORE interface support interrupts?
Solution 1:
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. Generates an inter-rupt 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.
The designer can turn on the interrupt logic in the PCI32
interface either during download or by editing the cfg.1/.v/.vhd
files as appropriate. The designer will need to assign a pin
location for this if enabled.
The LogiCORE interface however, does not support the Interrupt
acknowldge capability.
End of Record #5214 - Last Modified: 10/01/99 11:29 |
