Pins Not Configurable (always high/low)

Hi,

I'm working with Stratix IV GX FPGA Development Kit.

When I used HSMC port, there're some pins not configurable.

I can set these pins as output pins in Quartus II, but their output level never change.

For instance,

AW6 --> always HIGH

AW5 --> always HIGH

AV5 --> always HIGH

AW4 --> always LOW

AR5 --> always LOW

AT5 --> always LOW

(... and there're much more)

I've checked user manual but still got no idea.

Any help or comment are appreciated.

Thanks a lot.