Why PCI9054 fails to assert pci interrupt when local interrupt input is pulled down? Any advice?

Hi all,

I am doing a project involving PCI9054.

I meet a problem of interrupt. I wanna assert a PCI interrupt using
the
LINT# pin which is set as input with the INTCSR register being setting
as:
0X0f000900. But when I pull down the level of LINT# that is drived by
FPGA, the INTCSR becomes 0X0f000100, that is, INTCSR[11](local
interrupt
input enable) is cleared and INTCSR[15](local input interrupt active)
fails
to be set 1. And also the interrupt handler is not called. I have no
idea
what the reason.

However, when I set INTCSR as 0X0f000800 (PCI interrupt is not
enabled)
and then pull down LINT#, the INTCSR can come to the ideal value:
0X0f008800. I dont know its the reason of WinDriver diagnostic program
or
the PCI9054 itself.

Any advice will be helpful, Thank u very much!

Leon,
.

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