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gt2n: port gemmini - #239

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VLSIDA:mainfrom
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gt2n: port gemmini#239
dhgaddy wants to merge 1 commit into
VLSIDA:mainfrom
dhgaddy:gt2n-support

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@dhgaddy

@dhgaddy dhgaddy commented Aug 30, 2026

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Summary

  • Adds gemmini to the gt2n platform (already on asap7/nangate45/sky130hd).
  • Reaches _final. Setup clean (WNS +2.38ps). Hold has 15 residual
    violations (worst -9.83ps, TNS -31.85ps) -- see DECISIONS.md.

QoR summary

Design Fmax Die area (µm²)
gemmini 689.7 MHz 34547.3

Reaches _final with CORE_UTILIZATION=87 (PLACE_DENSITY 0.94),
MAX_ROUTING_LAYER=M11, MIN_CLK_ROUTING_LAYER=M4, clock period 1450ps
(Fmax 689.7MHz). Die area 34547.3 um^2 (core 33778.4 um^2), ~1.33M
instances.

Setup: WNS +2.38ps, 0 violations.
Hold: WS -9.83ps, TNS -31.85ps, 15 violations.

Input delay set to +67ps above the standard clk_io_pct*period value
(357ps vs 290ps), to help hold.
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