Pins Not Configurable (always high/low)

[Altera_Forum]

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.

[Altera_Forum]

What are these pins connected to inside the FPGA?

[Altera_Forum]

--- Quote Start ---  What are these pins connected to inside the FPGA?  --- Quote End ---    According to schematics,  AW6 --> DIFFIO_RX_R12p AW5 --> DIFFIO_RX_R12n AV5 --> DQ6R/DIFFIO_RX_R10p AW4 --> DQ6R/DIFFIO_RX_R10n AR5 --> DQS7R/DIFFIO_RX_R11p AT5 --> DQS7R/DIFFIO_RX_R11n  Any idea?