PPA at System Level · arch

Computer Architecture · All levels

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System-level PPA planning turns product targets into block budgets with owners. Each budget carries modes, corners, margin and a signoff gate.

Budget flow from product targets to signoff.

Budgets flow from product targets to owned blocks, get checked against floorplan evidence, then pass negotiation to signoff.

Lesson	What it covers
PPA budget ledger	From product KPIs to a signed ledger with margin and escalation.
Workload-weighted model	Weighted speedup, energy per operation and guardband stacking.
Floorplan-aware budgets	Partition by proximity, budget wire latency and price domain cuts.
Budget negotiation	Delta ledgers, voltage-frequency tradeoffs and margin discipline.
Architecture signoff	Evidence matrices, conditional approval and waiver control.

Check yourself A block meets its power budget at nominal voltage but the chip still misses its system target. Name two places the missing power can hide.

Integration overhead outside any block budget, such as clock distribution and fabric, and a workload mix that differs from the single KPI the block was signed against.

Up nextPPA Budget Ledger

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