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The '''Interface Logic Model''' (ILM) is a technique to model blocks in [[hierarchy|hierarchal]] [[VLSI]] [[implementation]] flow. It is a gate level [[Model (science)|model]] of a physical block where only the connections from the [[input (computer science)|input]]s to the first stage of flip-flops, and the connections from the last stage of [[Flip-flop (programming)|flip-flops]] to the outputs are in the model, including the flip-flops and the [[clock tree]] driving these flip-flops. All other internal flip-flop to flip-flop paths are stripped out of the ILM.
The advantage of ILM is that the entire path (clock to clock path) is visible at top level for [[interface (computing)|interface]] nets, unlike traditional block-based hierarchal implementation flow. This gives better accuracy in analysis for interface nets at negligible additional [[computer memory|memory]] and [[run time (program lifecycle phase)|runtime]] overhead.
[[File:Flat ilm block view vlsi 600x540.jpg]]
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