Routing

• Routers typically prefer that the pins of cells lie on some grid for routing efficiency purposes

  • Routers can usually route to off grid pins but requires more execution time and memory.

• Grids are defined for each routing layer

  • Grid spacing should be at least line-on-via, and is usually via-on-via

• A HVH routing styles means that there are three layers; with the first layer running horizontally, 2nd vertically, 3rd horizontally (M1 H, M2 V, M3 H)

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