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Altera_Forum
Honored Contributor I
724 Views

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.
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2 Replies
Altera_Forum
Honored Contributor I
18 Views

What are these pins connected to inside the FPGA?

Altera_Forum
Honored Contributor I
18 Views

 

--- 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?
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