How to mask RAM input using Tetramax?

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edaboard2013

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I have an architecture with 20 functional inputs and ram[400..0].
I want Tetramax to calculate the Fault coverage considering just the functional inputs and NOT RAM inputs.
I used the command "add_constraint" to set the list { ram [0] ... ram [9]} to 0 then to 1 then to x and every time the test coverage is around 68% !!!!
Is there any other way to mask the RAM input by using a file or a script?
Thank you for helping me
 

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