Altera PCI Compiler - 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 Table 3–2 :
(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