We have dynamic IR issue where specific location; cells are already low drive strength and no space to add decaps. We can still reduce IR by following ways:
o
Improve PDN: add extra stripes or vias in that
region if possible.
o
Change in switching window: Analyze the
switching activity. If many cells (even low-drive ones) in the area switch
simultaneously causing the droop, try to introduce small timing delays on
non-critical paths feeding into this region to slightly spread out the
switching events over time. This reduces the peak current demand at any single
instant.
o
VT
Swapping (Higher Vt): if there are some LVT cells contributing to the
switching current in the region, swapping them to higher Vt (SVT/HVT)
o
Re-evaluate
Floorplan/Placement:
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