Altera PCI Compiler User Manual
Page 88
3–14
User Guide Version 11.1
Altera Corporation
PCI Compiler
October 2011
PCI Bus Signals
intan
Open-Drain
Low
Interrupt A. The
intan
signal is an active-low interrupt to the
host and must be used for any single-function device requiring
an interrupt capability. The PCI MegaCore functions assert
intan
only when the local side asserts the
lirqn
signal and
the
int_dis
bit (bit 10 of the command register) is 0.
Note to
(1)
In the PCI MegaCore function symbols, the bidirectional control signals are separated into two components: input
and output. For example, framen has the input framen_in and the output framen_out. This separation of
signals allows the PCI MegaCore function to obtain better slack on set-up times.
Table 3–2. PCI Interface Signals (Part 4 of 4)
Name
Type
Polarity
Description