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feat(v2): M5 Neural Director, first-free job scheduling

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Implements M5: neural_director.v dispatches job descriptors to
whichever of N_SLOTS (memory_manager, neural_processor) pairs is
currently free (first-free scheduling per §9's initial policy), with
a parametric-depth ready-queue FIFO for jobs arriving faster than
slots can absorb them.

Scope for this milestone (see decisions.log DEC-0007): a reduced
4-state FSM (DIR_IDLE/SCAN_READY/ALLOCATE/ERROR) rather than §9's full
8-state baseline -- dependency tracking, the waiting queue, and
wake-up are §10's explicit responsibility (Dependency Manager, M6, not
yet built), and slot-completion detection runs as an always-active
per-slot tracker rather than a dedicated FSM state, for the same
reason DEC-0002 already gave for the Neural Processor's own FSM
(gating concurrent per-unit progress behind one shared state kills
throughput).

Verified with Verilator (N_SLOTS=2, each slot backed by its own
independent behavioral memory rather than sharing V1's real PSRAM --
M4 already proved that path for one slot; this milestone's own concern
is scheduling across multiple slots): 4/4 tests pass -- 3 jobs
submitted to 2 slots (first two dispatch immediately, third correctly
queues until a slot frees), and a deliberate burst that forces the
ready queue to genuinely fill and recover.

Real synthesis: 0 CHECK problems, 382 LUT4/366 FF/4 CCU2C/0 DSP. Real
place&route (via a synthesis-only timing harness, same TRELLIS_IO
pin-budget reason as M2/M4): Fmax 250.50 MHz, PASS at 80MHz.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
This commit is contained in:
michele
2026-09-05 14:46:32 +02:00
co-authored by Claude Sonnet 5
parent 175f697ae1
commit 2e4cedc761
18 changed files with 82810 additions and 1 deletions
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@@ -137,3 +137,25 @@ errors: vedi errors.log ERR-0005 (ricorrenza), ERR-0006 (3 bug nuovi).
decision: vedi decisions.log DEC-0006 (motore di prefetch singolo +
registro pendente, nessun arbitro backend ancora necessario).
next_action: M5 -- neural_director.v, scheduling first-free.
[2026-09-05T17:00:00Z] commit=175f697 session=v2-M5-neural-director
module: hardware/v2/rtl/neural_director.v
action: implementato M5 -- Neural Director, scheduling first-free
(§9) su N_SLOTS coppie (memory_manager, neural_processor). FSM
ridotta a 4 stati (DIR_IDLE/SCAN_READY/ALLOCATE/ERROR) -- dependency
tracking/wake-up rimandati al Dependency Manager (M6, non ancora
costruito), rilevamento completamenti gestito da un tracker
sempre-attivo per-slot (non uno stato dedicato da rivisitare).
reason: roadmap M5.
result: 4/4 test PASS (N_SLOTS=2) -- dispatch first-free confermato,
coda pronta con backpressure reale confermata (riempimento e
recupero), 3 job su 2 slot con il terzo correttamente in coda fino
a liberazione di uno slot. 2 bug di testbench trovati e risolti
(non RTL): DEPTH di sim_byte_mem troppo piccolo per il range di
indirizzi usato, e una condizione di attesa che si fermava al primo
job completato invece che a tutti e tre. Sintesi reale: 0 problemi,
382 LUT4/366 FF/4 CCU2C/0 DSP. Fmax reale (via harness): 250.50 MHz.
errors: nessun bug RTL, solo 2 bug di testbench (vedi experiments.log
EXP-0006).
decision: vedi decisions.log DEC-0007.
next_action: M6 -- dependency_manager.v.