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Synthesis with input pin mode constrain

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vlsi_freak

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Hi,

I am having an input to my module, which decides the mode of operation of the system.
But, the user using my IP knows that, in what mode it is going to operate so, he can permanently tie this input to HIGH or LOW based his mode requirements.

The logic required for one mode is different to another mode. Is there any option in synthesising, where i can save the hardware when working in a particular mode of my IP. I mean, can i say that the input mode pin will be always HIGH and synthesise.

Plz help me to know about this.

regards,
freak
 

when you synthesize a design, it becomes hard. i.e cannot be changed. So i dont understand what is the need of that pin at all, when it cannot be used after synthesis. You can just make that pin an internal signal, assign it a '0' or a '1' value and synthesize 2 variants of your chip.
If you kill the programability of a pin, it should'nt be there, should it?
kr,
Avi
 

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