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refactor(kg): share a single keccak_core across G/H, SampleNTT, CBD (4->1)

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KeyGen's Keccak consumers (G/H via sha3, A via SampleNTT, C via CBD) run in
disjoint top-FSM phases, so one keccak_core suffices. Add sha3_top_shared
(keccak_core externalised as kc_* ports, like the existing sample_*_shared
variants); mlkem_top now instantiates one keccak_core and a phase mux that
routes kc_state_i/kc_valid_i from the active consumer and gates kc_valid_o
per consumer (inactive samplers latch squeeze state unconditionally).

Cuts the KeyGen datapath from 4 keccak_core (1600-bit state + 24-round logic
each) to 1 -- the dominant ASIC area win. 11/11 KAT PASS (K=2 c0-4, K=3/4
c0-2), byte-exact, 0 file-not-found.
This commit is contained in:
FallenSigh
2026-06-28 15:35:55 +08:00
parent 851630f73c
commit 460a6ed70c
3 changed files with 263 additions and 9 deletions
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6
sync_rtl/top/TB/xsim_run.tcl
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@@ -9,9 +9,9 @@
# ---- Step 1: compile RTL ----
xvlog -sv --relax -i . sync_rtl/sha3/keccak_round.v
xvlog -sv --relax -i . sync_rtl/sha3/keccak_core.v
xvlog -sv --relax -i . sync_rtl/sha3/sha3_top.v
xvlog -sv --relax -i . sync_rtl/sample_ntt/sample_ntt_sync.v
xvlog -sv --relax -i . sync_rtl/sample_cbd/sample_cbd_sync.v
xvlog -sv --relax -i . sync_rtl/sha3/sha3_top_shared.v
xvlog -sv --relax -i . sync_rtl/sample_ntt/sample_ntt_sync_shared.v
xvlog -sv --relax -i . sync_rtl/sample_cbd/sample_cbd_sync_shared.v
xvlog -sv --relax -i . sync_rtl/ntt/barrett_mul.v
xvlog -sv --relax -i . sync_rtl/ntt/zeta_rom.v
xvlog -sv --relax -i . sync_rtl/ntt/butterfly_unit.v