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QSF setting similar to Xilinx Prohibit

Altera_Forum
Honored Contributor II
‎06-25-2010 01:23 PM
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Hello, 

 

I would like to know if there is a QSF setting that is similar to the Xilinx Prohibit setting. The prohibit setting disallows the use of a pin location e.g. 

 

CONFIG PROHIBIT = "A10"; disallows the use of pin A10 

 

The only setting I could find is reserve_pin but I am not sure if this does the same as I also have to set a driving value. If this is a similar setting what should I select for the driving value? 

 

Thanks, 

 

Devas
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Altera_Forum
Honored Contributor II
‎06-25-2010 05:33 PM
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The reserve assignment is what you want to use.  

 

As an example: 

set_location_assignment PIN_P4 -to user_reserve_1 set_instance_assignment -name RESERVE_PIN "AS INPUT TRI-STATED" -to user_reserve_1 

 

What you select for the driving value is up to you and depends on what the pin is connected to. You must have some reason for wanting to prohibit use of it. Do you want to tri-state the pin, give it a weak pull-up, make it drive ground, make it drive high? 

 

Jake
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