Static IR-drop closure

A static IR (current times resistance) drop run flagged a violation over a non-uniform current map (the dashed circles are the high-current regions). You close it by sizing the metal stack, not one layer: current flows from the ring down through the coarse top straps, the finer mid straps, and the fixed M1 (metal-1) follow-pin rails to the cells, and each layer adds resistance.

You have three knobs: the ring, the M8 top-strap density (vertical, coarse), and the M5 mid-strap density (horizontal, finer). The map starts deep in the red.

• Peak IR drop under budget - M8 is dedicated power metal and cheap for routing, so lean on it (and the ring) for the die-wide drop. But M8 is coarse and cannot fix the local drop at the hotspots on its own: that needs M5.
• Signal routing closes - M5 shares its layers with the signals, so its density eats routing tracks. Use only as much M5 as routing can afford. Run Place & Route to check.

Max the ring and M8, then thread in just enough M5 to pull the hotspots under budget without breaking routing. Place & Route, then Submit design.