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feat: N=8 hybrid systolic promoted to the real, definitive deployment target (EXP-0096)

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New n8_system_ddr3_top.v: a real, permanent, named top-level (not a
build-time -generic override), byte-for-byte the same RTL as
n16_system_ddr3_top.v with N_GROUPS defaulting to 2. Real, full P&R
under this file's own name reproduces EXP-0095's own generic-override
result exactly: WNS=0.000ns, WHS=+0.017ns, 0 failing setup endpoints,
64 DSP48E1/26.7%, 12535 LUTs/19.77%.

New tb_n8_system_ddr3.v (real DDR3-model methodology, adapted from
tb_n16_system_ddr3.v, M=16 positions covering every one of the 2
groups x 4 PEs x 2 lanes exactly once): real functional xsim, 16/16
PASS, 0 errors -- closes the real functional-verification gap this
specific N previously had.

N=8 is now BOTH functionally verified AND timing-closed under its own
permanent name -- the real, definitive deployment target. N=2 kept as
a documented, valid fallback; N=16 kept as documented, functionally-
verified-but-not-timing-closed future work, not abandoned.

docs/PHYSICAL_REALIZATION.md, docs/ARCHITECTURE_ANALYSIS.md,
docs/PINOUT.md updated to reflect N=8 as the current real signoff.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUG92aM9m68TRc4rG55BcC
This commit is contained in:
michele
2026-09-21 08:29:04 +02:00
co-authored by Claude Sonnet 5
parent 6d06404428
commit 264950923b
6 changed files with 1006 additions and 51 deletions
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docs/ARCHITECTURE_ANALYSIS.md
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@@ -1,11 +1,16 @@
# FPGA-Neural V3 — Architecture Analysis: Timing, Bottlenecks, and Recommended Interventions # FPGA-Neural V3 — Architecture Analysis: Timing, Bottlenecks, and Recommended Interventions
Scope: the current, real, P&R-verified V3 design (`hardware/v3/`, branch Scope: the current, real, P&R-verified V3 design (`hardware/v3/`, branch
`v3-artix7`), updated through EXP-0088 (result-writeback engine, real, `v3-artix7`), updated through EXP-0095/0096 (N=8 hybrid systolic, real,
closed timing). The current real, trustworthy *timing* signoff is now closed timing — the current, definitive real deployment target, chosen
EXP-0088 (32-bit, 155.039MHz, WNS +0.100ns), replacing EXP-0086's own by the user after a real, measured N=4/8/16 timing curve). The current
pointer (which itself replaced EXP-0083's 16-bit-era one). Every number real, trustworthy *timing* signoff is now EXP-0095/0096
in this document is either (`n8_system_ddr3_top.v`, 32-bit DDR3, 155.039MHz, WNS 0.000ns, 8 real
parallel PEs), replacing EXP-0088's own N=2 pointer (which itself
replaced EXP-0086's, which replaced EXP-0083's 16-bit-era one). See §5.6
for the full real story, including N=16's own real RTL (functionally
verified but NOT timing-closed, kept as documented future work). Every
number in this document is either
directly measured (real simulation trace, real P&R report) or a calculation directly measured (real simulation trace, real P&R report) or a calculation
built from directly-measured building blocks — the two are labeled built from directly-measured building blocks — the two are labeled
explicitly throughout. Nothing here is guessed. explicitly throughout. Nothing here is guessed.
@@ -659,7 +664,7 @@ specifically to document where/how it breaks rather than to succeed):
--- ---
### 5.6 [N=8 REALLY CLOSES timing (0 failing endpoints); N=16 still -0.338ns — EXP-0089…0095] Hybrid systolic scaling: up to 4 groups × 4-PE weight-stationary chains ### 5.6 [N=8 IS THE REAL, DEFINITIVE DEPLOYMENT TARGET — `n8_system_ddr3_top.v`, EXP-0089…0096] Hybrid systolic scaling: up to 4 groups × 4-PE weight-stationary chains
Captured from a 2026-09-20 brainstorming session as a purely exploratory Captured from a 2026-09-20 brainstorming session as a purely exploratory
idea; the same day, per the user's own explicit reprioritization, the real idea; the same day, per the user's own explicit reprioritization, the real
@@ -832,16 +837,36 @@ and clock domain, not a projection. N=4 is a hair's breadth away
placer/router variance, not a contradiction). **The real failure point placer/router variance, not a contradiction). **The real failure point
is specifically between N=8 (closed) and N=16 (EXP-0094: −0.338ns)** — is specifically between N=8 (closed) and N=16 (EXP-0094: −0.338ns)** —
N=12 (N_GROUPS=3) has not yet been measured and would narrow this N=12 (N_GROUPS=3) has not yet been measured and would narrow this
further. Real, disclosed caveat: N=4/N=8 have not yet had their own further. Real bug found and fixed first: `neural_director_grouped.v`'s
dedicated functional xsim (only N=16's full-scale RTL is functionally own bare `$clog2(N_GROUPS)` was invalid (`[-1:0]`) for the
verified, EXP-0092/0094) — the correctness argument for N=4/N=8 rests never-before-tested N_GROUPS=1 case — fixed with the same real
on the architecture's own embarrassingly-parallel-across-groups design, `SELW`-style guard pattern `sdram_arbiter_n.v` already established.
not yet a directly measured result at those specific N. Real bug found
and fixed first: `neural_director_grouped.v`'s own bare **N=8 promoted to the real, definitive deployment target (EXP-0096)**
`$clog2(N_GROUPS)` was invalid (`[-1:0]`) for the never-before-tested — the user's own explicit decision ("creiamo una versione funzionante
N_GROUPS=1 case — fixed with the same real `SELW`-style guard pattern completamente per N=8, la pushiamo come versione definitiva"). New
`sdram_arbiter_n.v` already established. See EXP-0095's own `hardware/v3/rtl/n8_system_ddr3_top.v` — a real, permanent, named
`next_action`. top-level (not a build-time override), byte-for-byte the same RTL as
`n16_system_ddr3_top.v` with `N_GROUPS` defaulting to 2. Real, full
P&R re-run under this file's own name gives the EXACT SAME numbers as
the generic-override result (WNS=0.000ns, WHS=+0.017ns, 0 failing
endpoints, 64 DSP48E1/26.7%, 12535 LUTs/19.77%) — confirms the file
split is correct. New `tb_n8_system_ddr3.v` (real DDR3-model
methodology, M=16 positions, every one of the 2 groups × 4 PEs × 2
lanes exercised exactly once): **real functional xsim, 16/16 PASS, 0
errors** — closes the real, disclosed functional-verification gap
this section previously flagged for N=8 specifically.
**Current real status: N=8 (`n8_system_ddr3_top.v`) is BOTH
functionally verified AND timing-closed under its own permanent real
name — the definitive deployment target.** N=2 (`n2_system_ddr3_top.v`,
EXP-0088) remains documented as a real, valid, simpler fallback. N=16
(`n16_system_ddr3_top.v`) remains real, functionally-verified RTL, not
abandoned, just not timing-closed and not the current target. Real,
disclosed caveat carried forward: N=8's WNS=0.000ns is an exact-zero
margin — any future RTL change touching this top-level or its
dependents needs a fresh real P&R (same `Explore`/`ExtraNetDelay_high`/
`AggressiveExplore` directive stack) before trusting timing again.
**The problem it targets**: plain N=16 independent cores (§5.5's own **The problem it targets**: plain N=16 independent cores (§5.5's own
"documentary, expected to break" framing) means 16 independent DDR3 "documentary, expected to break" framing) means 16 independent DDR3
docs/PHYSICAL_REALIZATION.md
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@@ -165,38 +165,72 @@ these from an ESP32 doing real JTAG bit-banging (TAP state machine, IR/DR
shifting) rather than a bench programmer — that firmware is separate, shifting) rather than a bench programmer — that firmware is separate,
software-side work, not covered here. software-side work, not covered here.
## 3. Real timing signoff (EXP-0088, the current, trustworthy number — real 32-bit DDR3 channel + result-writeback engine, CLOSED) ## 3. Real timing signoff (EXP-0095/0096, the current, definitive target — N=8 hybrid systolic, `n8_system_ddr3_top.v`, CLOSED)
Real in-context Vivado place-and-route (not out-of-context, not estimated): **This is the real, definitive deployment target as of 2026-09-21**
(the user's own explicit decision, after a real, measured N=4/8/16
timing curve found N=8 to be the largest real configuration that
closes timing cleanly — see `docs/ARCHITECTURE_ANALYSIS.md` §5.6 for
the full real story). Top-level RTL: `hardware/v3/rtl/
n8_system_ddr3_top.v` — 2 groups × 4 PEs, shared-weight-broadcast
systolic architecture (`systolic_group.v`/`packed_pe.v`,
`neural_director_grouped.v`, `sdram_arbiter_hier.v`'s own real
hierarchical 2-level arbiter), same real DDR3/SPI/flash bridge as
every other real V3 top-level. Real in-context Vivado place-and-route
(not out-of-context, not estimated):
| Metric | Value | | Metric | Value |
|---|---| |---|---|
| DDR3 PHY clock (sys_clk_p/n) | **310.078 MHz** (3.225ns period) | | DDR3 PHY clock (sys_clk_p/n) | **310.078 MHz** (3.225ns period) |
| Compute domain clock (ui_clk/clk_pll_i, PLL-derived 2:1 from sys_clk) | **155.039 MHz** | | Compute domain clock (ui_clk/clk_pll_i, PLL-derived 2:1 from sys_clk) | **155.039 MHz** |
| WNS (setup slack) | **+0.099962 ns** — real, closed. Re-verify with a fresh P&R after ANY further logic addition. | | WNS (setup slack) | **0.000 ns** — real, closed, 0 failing setup endpoints (EXP-0095/0096). Re-verify with a fresh P&R after ANY further logic addition — this margin is exactly zero, no slack to spare. |
| WHS (hold slack) | +0.036275 ns | | WHS (hold slack) | +0.017 ns |
| Failing endpoints | 0 of 27868 (setup), 0 of 27865 (hold), 0 of 10529 (pulse width) | | Failing endpoints | 0 of 63212 (setup), 0 of 63209 (hold) |
| LUTs used | 6642 / 63400 (10.48%) | | LUTs used | 12535 / 63400 (19.77%) |
| DSP48E1 used | 16 / 240 (6.67%) — 8 per compute core × 2 cores, unchanged since EXP-0059 | | Registers used | 19902 / 126800 (15.70%) |
| Block RAM used | 0 | | DSP48E1 used | 64 / 240 (26.7%) — 8 per PE × 8 real parallel PEs |
| STARTUPE2 used | 1 / 1 (100%) — the config-flash bridge |
| DDR3 channel width | **32-bit real physical channel** (two MT41J128M16JT-125:K chips) — see §3.1 | | DDR3 channel width | **32-bit real physical channel** (two MT41J128M16JT-125:K chips) — see §3.1 |
| Real physical bandwidth ceiling | **~2.48 GB/s** (2× EXP-0083's 16-bit ~1.24 GB/s, real, closed timing — not a projection) | | Real physical bandwidth ceiling | **~2.48 GB/s** (unchanged from the N=2 baseline — same DDR3 channel, shared across 8 real parallel PEs instead of 2) |
| Result writeback | **real, into DDR3** (EXP-0088, `result_writeback.v`) — no longer literal top-level pins, see §4.6/§5.3 of `docs/ARCHITECTURE_ANALYSIS.md` | | Real parallelism | **8 real parallel processing elements** (4× the original N=2 design) |
| Result writeback | **real, into DDR3** (`result_writeback.v`), see §4.6/§5.3 of `docs/ARCHITECTURE_ANALYSIS.md` |
Signoff history (every real change, same target, in-context P&R): **Real, disclosed caveat**: this WNS=0.000ns margin is exactly zero —
real, closed, but with zero slack. Re-run a real P&R (same
`opt_design -directive Explore` / `place_design -directive
ExtraNetDelay_high` / `phys_opt_design -directive AggressiveExplore` /
`route_design -directive AggressiveExplore` directive stack used to
reach this result, EXP-0094/0095) after ANY further RTL change before
trusting timing again — do not assume it still holds.
| EXP | WNS (ns) | LUTs | DSP48E1 | **Superseded, real predecessor signoff (N=2, flat architecture,
|---|---|---|---| `n2_system_ddr3_top.v`, EXP-0088)** — kept below for reference; still
| 0074 (first real DDR3 + pins) | +0.040 | 5140 | 16 | a real, valid, simpler fallback target if N=8's zero-margin closure
| 0076 (+regfile, +pins, +SPI fix) | +0.056 | 5173 | 16 | ever proves too fragile in practice:
| 0078 (+flash bridge, STARTUPE2) | +0.013 | 5213 | 16 |
| 0079 (+real activation engine) | +0.030 | 5379 | 16 | | Metric | Value |
| 0082 (+denser activation packing) | +0.068 | 5437 | 16 | |---|---|
| 0083 (+DDRManager phase 1, `ddr_prefetch_mgr.v`, 16-bit) | +0.073 | 5644 | 16 | | WNS (setup slack) | +0.099962 ns |
| 0084 (32-bit DDR3 widening, 2900ps/172.414MHz) | -0.618 (FAILED) | 6418 | 16 | | WHS (hold slack) | +0.036275 ns |
| 0086 (32-bit DDR3 widening, clock reverted to 3225ps/155.039MHz) | +0.096 (CLOSED) | 6382 | 16 | | LUTs used | 6642 / 63400 (10.48%) |
| 0088 (+result-writeback engine, `result_writeback.v`) | **+0.100 (CLOSED)** | 6642 | 16 | | DSP48E1 used | 16 / 240 (6.67%) — 8 per compute core × 2 cores |
| Real parallelism | 2 real parallel processing elements |
Signoff history (every real change, in-context P&R):
| EXP | Target | WNS (ns) | LUTs | DSP48E1 |
|---|---|---|---|---|
| 0074 (first real DDR3 + pins) | N=2 | +0.040 | 5140 | 16 |
| 0076 (+regfile, +pins, +SPI fix) | N=2 | +0.056 | 5173 | 16 |
| 0078 (+flash bridge, STARTUPE2) | N=2 | +0.013 | 5213 | 16 |
| 0079 (+real activation engine) | N=2 | +0.030 | 5379 | 16 |
| 0082 (+denser activation packing) | N=2 | +0.068 | 5437 | 16 |
| 0083 (+DDRManager phase 1, `ddr_prefetch_mgr.v`, 16-bit) | N=2 | +0.073 | 5644 | 16 |
| 0084 (32-bit DDR3 widening, 2900ps/172.414MHz) | N=2 | -0.618 (FAILED) | 6418 | 16 |
| 0086 (32-bit DDR3 widening, clock reverted to 3225ps/155.039MHz) | N=2 | +0.096 (CLOSED) | 6382 | 16 |
| 0088 (+result-writeback engine, `result_writeback.v`) | N=2 | +0.100 (CLOSED) | 6642 | 16 |
| 0093 (hybrid systolic, flat 21-way arbiter) | N=16 | -0.913 (FAILED) | 19751 | 128 |
| 0094 (+hierarchical 2-level arbiter, +P&R directive tuning) | N=16 | -0.338 (still FAILED) | 19936 | 128 |
| 0095/0096 (`n8_system_ddr3_top.v`, hybrid systolic) | **N=8** | **0.000 (CLOSED)** | 12535 | 64 |
### 3.1 Real 32-bit DDR3 widening — functionally verified AND timing CLOSED (EXP-0084 → EXP-0086) ### 3.1 Real 32-bit DDR3 widening — functionally verified AND timing CLOSED (EXP-0084 → EXP-0086)
@@ -363,12 +397,17 @@ when it actually fires, instead of polling every loop iteration.
## 7. Known-open items (honestly disclosed, not hidden) ## 7. Known-open items (honestly disclosed, not hidden)
- Scaling past N=2 compute cores (silicon budget allows up to ~30 per the - Scaling past N=2 compute cores: **RESOLVED, real N=8 is now the
DSP48E1 count) is not yet built or timing-verified. The real pin-budget definitive deployment target** (§3, EXP-0095/0096, `n8_system_ddr3_
blocker that used to require this (`result_data_a/b` as literal top.v`, a real hybrid systolic shared-weight-broadcast architecture,
top-level pins) is now REMOVED (EXP-0088, `result_writeback.v` — see 2 groups × 4 PEs, WNS=0.000ns CLOSED). Real N=4/8/16 P&R curve
`docs/ARCHITECTURE_ANALYSIS.md` §4.6/§5.3) — real N=2/4/8/16 P&R measured: N=4 −0.005ns (2 failing endpoints, essentially at the
scaling tests are the next real milestone, no longer blocked. edge), N=8 **0.000ns (CLOSED)**, N=16 −0.338ns (still failing even
after a real hierarchical-arbiter fix + P&R directive tuning, EXP-
0093/0094) — see `docs/ARCHITECTURE_ANALYSIS.md` §5.6 for the full
real story. N=16 remains real, functionally verified RTL
(`n16_system_ddr3_top.v`), just not yet timing-closed; not the
current real deployment target.
- `sys_rst` has only a *tentative* real pin (G13, bank 15, EXP-0084 — - `sys_rst` has only a *tentative* real pin (G13, bank 15, EXP-0084 —
chosen just to unblock real P&R, not a final board decision) — assign chosen just to unblock real P&R, not a final board decision) — assign
its real, permanent location once the rest of the board layout (reset its real, permanent location once the rest of the board layout (reset
@@ -392,6 +431,6 @@ when it actually fires, instead of polling every loop iteration.
checkpoint) — see §6. checkpoint) — see §6.
- `result_writeback.v` (EXP-0088) is real, built, and verified (9/9 PASS - `result_writeback.v` (EXP-0088) is real, built, and verified (9/9 PASS
including a new real DDR3 read-after-write check, `tb_packed_slot.v`). including a new real DDR3 read-after-write check, `tb_packed_slot.v`).
Real P&R re-verification for this specific addition is the next real P&R re-verified with the result-writeback addition (EXP-0088) and,
step, together with the N=2/4/8/16 core-count scaling tests it since then, real N=4/8/16 scaling has been built and P&R-tested — see
unblocks — see `docs/ARCHITECTURE_ANALYSIS.md` §5.3/§5.5. §3 above and `docs/ARCHITECTURE_ANALYSIS.md` §5.3/§5.6.
docs/PINOUT.md
+7 -3
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@@ -6,9 +6,13 @@ board). This is a flattened, board-layout-ready extract of
narrated source (it explains *why* each pin was chosen and every real narrated source (it explains *why* each pin was chosen and every real
conflict/fix found along the way); this file is the quick reference for conflict/fix found along the way); this file is the quick reference for
schematic capture. Every pin below comes from a real routed design schematic capture. Every pin below comes from a real routed design
(`n2_system_ddr3_top_routed.dcp`, EXP-0086 signoff) or the MIG-generated (originally `n2_system_ddr3_top_routed.dcp`, EXP-0086; the same real pin
`mig_7series_0.xdc` — none of it is guessed. Re-generate this file if set — DDR3/SPI/flash/config are all package-level, unaffected by internal
`docs/PHYSICAL_REALIZATION.md` §2 ever changes. core count — was re-confirmed real and unchanged in `n8_system_ddr3_top.v`'s
own real routed signoff, EXP-0095/0096, now the current definitive
deployment target, see `docs/PHYSICAL_REALIZATION.md` §3) or the
MIG-generated `mig_7series_0.xdc` — none of it is guessed. Re-generate
this file if `docs/PHYSICAL_REALIZATION.md` §2 ever changes.
## Bank summary ## Bank summary
hardware/v2/logs/experiments.log
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@@ -6720,3 +6720,67 @@ DIRECTLY measured at N=16 so far). (2) optionally, real P&R at N=12
(N_GROUPS=3) to pin down the exact real N where the WNS trend crosses (N_GROUPS=3) to pin down the exact real N where the WNS trend crosses
zero. (3) optionally, a real re-attempt at N=4 (likely closes on retry, zero. (3) optionally, a real re-attempt at N=4 (likely closes on retry,
given how close -0.005ns already is). given how close -0.005ns already is).
EXP-0096 -- N=8 promoted to the real, definitive deployment target:
dedicated top-level, real P&R re-confirmed under its own name, real
functional xsim 16/16 PASS (2026-09-21, user's own explicit direction:
"si creaiamo una versione funzionante completamente per n=8 la
pushiamo come versione definitiva")
CONTEXT: EXP-0095's own real N=8 closure (WNS=0.000ns) was measured via
a build-time `synth_design -generic N_GROUPS=2` override against
n16_system_ddr3_top.v -- real and trustworthy, but not yet a real,
permanent, named top-level file (this project's own established
convention: one real file per real deployment configuration, e.g.
n2_system_ddr3_top.v), and not yet functionally verified at this
specific N (only N=16's full-scale RTL had a dedicated functional
xsim, EXP-0092/0094).
METHOD: (1) new `hardware/v3/rtl/n8_system_ddr3_top.v` -- byte-for-byte
the same real RTL structure as n16_system_ddr3_top.v, N_GROUPS
defaulting to 2 instead of 4 (still a real, visible parameter, not
hardcoded away), real header documenting this as the definitive
2026-09-21 target. (2) new `hardware/v3/sim/tb_n8_system_ddr3.v`,
directly adapted from tb_n16_system_ddr3.v's own real DDR3-model
methodology (same real 2-chip 32-bit DDR3 model, same real
mig_7series_0_mig, real Vivado xsim), scaled to N_GROUPS=2/M=16
positions (exercises every one of the 2 groups x 4 PEs x 2 lanes
exactly once). (3) real, full P&R re-run under n8_system_ddr3_top.v's
own real name (added to the real Vivado project's sources_1 fileset as
a direct reference, real stale-import check confirmed empty before
trusting the result) with the same real directive stack that closed
N=8 the first time (EXP-0094/0095: Explore/ExtraNetDelay_high/
AggressiveExplore).
REAL RESULT: P&R under the real n8_system_ddr3_top.v name gives the
EXACT SAME real numbers as EXP-0095's own generic-override result --
**WNS=0.000ns, TNS=0.000ns, 0 failing setup endpoints, WHS=+0.017ns**,
12535 LUTs (19.77%), 19902 registers (15.70%), 64 DSP48E1/240 (26.7%)
-- confirms the real file split was done correctly, byte-for-byte
equivalent RTL. Real functional xsim (`tb_n8_system_ddr3.v`, real DDR3
model, real Vivado xsim): **16/16 PASS, 0 errors**, `$finish` at
131145.8335ns -- closes the real, disclosed functional-verification
gap for this specific N.
DECISION: N=8 (`n8_system_ddr3_top.v`) is now the real, definitive
deployment target -- BOTH functionally verified AND timing-closed
under its own permanent real name, not a build-time override. Real,
disclosed caveat carried forward: WNS=0.000ns is an exact-zero real
margin, not a comfortable one -- any future RTL change to this top-
level or its dependents needs a fresh real P&R (same directive stack)
before trusting timing again, per this project's own "re-verify after
any further logic addition" discipline.
`docs/PHYSICAL_REALIZATION.md` §3 and §7, and
`docs/ARCHITECTURE_ANALYSIS.md`'s own top-of-document pointer, updated
to promote this as the current real signoff (replacing the EXP-0088
N=2 pointer) -- N=2 (`n2_system_ddr3_top.v`) kept documented as a real,
valid, simpler fallback; N=16 (`n16_system_ddr3_top.v`) kept documented
as real, functionally-verified-but-not-timing-closed future work, not
abandoned.
next_action: real board bring-up planning (schematic capture from
docs/PINOUT.md, BOM confirmation from docs/BOM.md -- both already real
and unaffected by the N_GROUPS choice, since DDR3/SPI/flash/config
pins are package-level, not internal-core-count-dependent) is the real
next milestone now that a real, closed, deployable RTL target exists.
hardware/v3/rtl/n8_system_ddr3_top.v
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@@ -0,0 +1,302 @@
`timescale 1ns/1ps
// ============================================================
// V3 -- REAL synthesis/P&R top for the N=8 (2 groups x 4 PEs) hybrid
// systolic system, the real, definitive deployment target (EXP-0095/
// 0096): byte-for-byte the SAME real RTL as n16_system_ddr3_top.v
// (EXP-0089..0094), just with N_GROUPS defaulting to 2 instead of 4 --
// forked into its own real top-level file (not just a build-time
// `-generic` override) so the definitive N=8 hardware target has a
// permanent, unambiguous real source of truth, matching this project's
// own established one-file-per-real-configuration convention
// (n2_system_ddr3_top.v, n16_system_ddr3_top.v).
//
// REAL, MEASURED RESULT THIS FILE EXISTS TO CAPTURE (EXP-0095): real,
// full P&R (synth_design+opt_design+place_design+phys_opt_design+
// route_design, same real XC7A100T-CSG324-2 part, same real 155.039MHz
// clk_pll_i domain N=2's own EXP-0088 signoff was measured on) gives
// **WNS=+0.000ns, TNS=0.000ns, 0 FAILING SETUP ENDPOINTS** -- a real,
// closed timing signoff, not a projection (measured via
// `-generic N_GROUPS=2` against n16_system_ddr3_top.v before this file
// existed; re-confirmed against this file's own real name/module in
// EXP-0096). 64 DSP48E1/240 (26.7%), matching the real 8 DSP/PE x 8 PE
// projection exactly.
//
// Everything else — MIG, mig_native_adapter.v, sdram_arbiter_hier.v
// (EXP-0094's own real hierarchical arbiter, already scales correctly
// to N_GROUPS=2's own real 3-way top level: 2 groups + 1 host),
// neural_director_grouped.v, spi_host_bridge_v3.v, flash_spi_master.v,
// host_mem_bridge.v — completely unmodified from n16_system_ddr3_top.v,
// same real zero-protocol-change finding (EXP-0090) still holds:
// N_SLOTS=8 passed to spi_host_bridge_v3.v purely informationally.
//
// ARBITER SLOT MAP (real, NUM_REQ=11): slots 0-1 = groups 0-1's own
// weight-fetch; slots 2-9 = the 8 PEs' own activation-fetch+writeback,
// 4 consecutive slots per group (group g's PEs at slots 2+4g..2+4g+3);
// slot 10 = host_mem_bridge.v.
// ============================================================
module n8_system_ddr3_top #(
parameter DATA_WIDTH = 8,
parameter P_IN = 8,
parameter ACC_WIDTH = 32,
parameter BURST_LEN = 8,
parameter JOB_ADDR_WIDTH = 26,
parameter MEM_ADDR_WIDTH = 25,
parameter LAYER_BYTES = 128,
parameter N_GROUPS = 2,
parameter QUEUE_DEPTH = 16
)(
input wire sys_clk_p,
input wire sys_clk_n,
input wire sys_rst,
input wire clk_ref_p,
input wire clk_ref_n,
inout wire [31:0] ddr3_dq,
inout wire [3:0] ddr3_dqs_n,
inout wire [3:0] ddr3_dqs_p,
output wire [13:0] ddr3_addr,
output wire [2:0] ddr3_ba,
output wire ddr3_ras_n,
output wire ddr3_cas_n,
output wire ddr3_we_n,
output wire ddr3_reset_n,
output wire [0:0] ddr3_ck_p,
output wire [0:0] ddr3_ck_n,
output wire [0:0] ddr3_cke,
output wire [0:0] ddr3_cs_n,
output wire [3:0] ddr3_dm,
output wire [0:0] ddr3_odt,
input wire sclk,
input wire mosi,
output wire miso,
input wire cs_n,
output wire flash_cs_n,
output wire flash_mosi,
input wire flash_miso,
output wire ui_clk_o,
output wire init_calib_complete,
output wire job_out_done,
output wire data_ready_n
);
localparam N_PES = N_GROUPS * 4; // 8
wire [27:0] app_addr;
wire [2:0] app_cmd;
wire app_en, app_rdy;
wire [127:0] app_wdf_data;
wire app_wdf_end;
wire [15:0] app_wdf_mask;
wire app_wdf_wren, app_wdf_rdy;
wire [127:0] app_rd_data;
wire app_rd_data_end, app_rd_data_valid;
wire ui_clk, ui_clk_sync_rst;
assign ui_clk_o = ui_clk;
mig_7series_0 u_mig (
.ddr3_dq(ddr3_dq), .ddr3_dqs_n(ddr3_dqs_n), .ddr3_dqs_p(ddr3_dqs_p),
.ddr3_addr(ddr3_addr), .ddr3_ba(ddr3_ba),
.ddr3_ras_n(ddr3_ras_n), .ddr3_cas_n(ddr3_cas_n), .ddr3_we_n(ddr3_we_n),
.ddr3_reset_n(ddr3_reset_n),
.ddr3_ck_p(ddr3_ck_p), .ddr3_ck_n(ddr3_ck_n),
.ddr3_cke(ddr3_cke), .ddr3_cs_n(ddr3_cs_n),
.ddr3_dm(ddr3_dm), .ddr3_odt(ddr3_odt),
.sys_clk_p(sys_clk_p), .sys_clk_n(sys_clk_n), .clk_ref_p(clk_ref_p), .clk_ref_n(clk_ref_n),
.app_addr(app_addr), .app_cmd(app_cmd), .app_en(app_en),
.app_wdf_data(app_wdf_data), .app_wdf_end(app_wdf_end),
.app_wdf_mask(app_wdf_mask), .app_wdf_wren(app_wdf_wren),
.app_rd_data(app_rd_data), .app_rd_data_end(app_rd_data_end),
.app_rd_data_valid(app_rd_data_valid), .app_rdy(app_rdy), .app_wdf_rdy(app_wdf_rdy),
.app_sr_req(1'b0), .app_ref_req(1'b0), .app_zq_req(1'b0),
.app_sr_active(), .app_ref_ack(), .app_zq_ack(),
.ui_clk(ui_clk), .ui_clk_sync_rst(ui_clk_sync_rst),
.init_calib_complete(init_calib_complete),
.device_temp(),
.sys_rst(sys_rst)
);
wire adp_req, adp_wr;
wire [MEM_ADDR_WIDTH-1:0] adp_addr;
wire [32*BURST_LEN-1:0] adp_wdata;
wire [4*BURST_LEN-1:0] adp_wmask;
wire [32*BURST_LEN-1:0] adp_rdata;
wire adp_ready, adp_busy;
mig_native_adapter #(.BURST_LEN(BURST_LEN), .ADDR_WIDTH(MEM_ADDR_WIDTH)) u_adapter (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.req(adp_req), .wr(adp_wr), .addr(adp_addr), .wdata(adp_wdata), .wmask(adp_wmask),
.rdata(adp_rdata), .ready(adp_ready), .busy(adp_busy),
.app_addr(app_addr), .app_cmd(app_cmd), .app_en(app_en), .app_rdy(app_rdy),
.app_wdf_data(app_wdf_data), .app_wdf_end(app_wdf_end), .app_wdf_mask(app_wdf_mask),
.app_wdf_wren(app_wdf_wren), .app_wdf_rdy(app_wdf_rdy),
.app_rd_data(app_rd_data), .app_rd_data_end(app_rd_data_end), .app_rd_data_valid(app_rd_data_valid)
);
// ---- real arbiter: 2 group weight-fetch + 8 PE activation/
// writeback + 1 host_mem_bridge = 11 ----
localparam NUM_REQ = N_GROUPS + N_PES + 1; // 2 + 8 + 1 = 11
localparam HOST_SLOT = NUM_REQ - 1; // 10
wire [NUM_REQ-1:0] req_active, req_grant, req_req, req_wr;
wire [NUM_REQ-1:0] req_ready, req_busy;
wire [NUM_REQ*MEM_ADDR_WIDTH-1:0] req_addr;
wire [NUM_REQ*32*BURST_LEN-1:0] req_wdata;
wire [NUM_REQ*4*BURST_LEN-1:0] req_wmask;
wire [NUM_REQ*32*BURST_LEN-1:0] req_rdata;
// real, hierarchical 2-level arbiter (EXP-0094), same real module
// as n16_system_ddr3_top.v -- generalizes cleanly to N_GROUPS=2
// (2 real leaf instances + a 3-way top instance: 2 groups + host).
sdram_arbiter_hier #(
.N_GROUPS(N_GROUPS), .PES_PER_GROUP(4), .ADDR_WIDTH(MEM_ADDR_WIDTH), .BURST_LEN(BURST_LEN)
) u_arb (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.req_active(req_active), .req_grant(req_grant),
.req_req(req_req), .req_wr(req_wr), .req_addr(req_addr),
.req_wdata(req_wdata), .req_wmask(req_wmask),
.req_rdata(req_rdata), .req_ready(req_ready), .req_busy(req_busy),
.ctrl_req(adp_req), .ctrl_wr(adp_wr), .ctrl_addr(adp_addr),
.ctrl_wdata(adp_wdata), .ctrl_wmask(adp_wmask),
.ctrl_rdata(adp_rdata), .ctrl_ready(adp_ready), .ctrl_busy(adp_busy)
);
// ---- grouped Director ----
wire job_in_valid, job_in_ready;
wire [JOB_ADDR_WIDTH-1:0] job_in_x_base, job_in_w_base, job_in_result_addr;
wire [15:0] job_in_n_tiles, job_in_node_id;
wire [N_GROUPS-1:0] group_job_start;
wire [JOB_ADDR_WIDTH*N_GROUPS-1:0] group_w_base;
wire [16*N_GROUPS-1:0] group_n_tiles;
wire [4*JOB_ADDR_WIDTH*N_GROUPS-1:0] group_pe_x_base_a, group_pe_x_base_b;
wire [4*JOB_ADDR_WIDTH*N_GROUPS-1:0] group_pe_result_addr_a, group_pe_result_addr_b;
wire [4*16*N_GROUPS-1:0] group_pe_node_id_a, group_pe_node_id_b;
wire [N_GROUPS-1:0] group_job_done;
localparam GROUP_IDX_WIDTH = (N_GROUPS <= 1) ? 1 : $clog2(N_GROUPS);
wire [GROUP_IDX_WIDTH-1:0] job_out_group_w;
wire [3:0] dir_state;
wire dir_error;
wire queue_empty;
neural_director_grouped #(
.ADDR_WIDTH(JOB_ADDR_WIDTH), .N_GROUPS(N_GROUPS), .QUEUE_DEPTH(QUEUE_DEPTH)
) u_dir (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.job_in_valid(job_in_valid), .job_in_ready(job_in_ready),
.job_in_x_base(job_in_x_base), .job_in_w_base(job_in_w_base),
.job_in_n_tiles(job_in_n_tiles), .job_in_result_addr(job_in_result_addr),
.job_in_node_id(job_in_node_id),
.group_job_start(group_job_start), .group_w_base(group_w_base), .group_n_tiles(group_n_tiles),
.group_pe_x_base_a(group_pe_x_base_a), .group_pe_x_base_b(group_pe_x_base_b),
.group_pe_result_addr_a(group_pe_result_addr_a), .group_pe_result_addr_b(group_pe_result_addr_b),
.group_pe_node_id_a(group_pe_node_id_a), .group_pe_node_id_b(group_pe_node_id_b),
.group_job_done(group_job_done),
.job_out_done(job_out_done), .job_out_group(job_out_group_w),
.dir_state(dir_state), .dir_error(dir_error), .queue_empty(queue_empty)
);
// ---- physical SPI host interface: UNMODIFIED (EXP-0090's own real
// finding -- zero protocol changes needed). N_SLOTS=8 reported
// purely informationally (REG_READ 0x03), matches the real total
// parallel-PE count, never gates any control logic in this module. ----
wire mem_req, mem_wr, mem_lb_n, mem_ub_n, mem_ready;
wire [MEM_ADDR_WIDTH-1:0] mem_addr;
wire [15:0] mem_wdata, mem_rdata;
wire soft_rst_pulse;
wire flash_xfer_active, flash_byte_req, flash_byte_done;
wire [7:0] flash_byte_wdata, flash_byte_rdata;
spi_host_bridge_v3 #(
.JOB_ADDR_WIDTH(JOB_ADDR_WIDTH), .MEM_ADDR_WIDTH(MEM_ADDR_WIDTH), .N_SLOTS(N_PES)
) u_spi (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.sclk(sclk), .mosi(mosi), .miso(miso), .cs_n(cs_n),
.init_calib_complete(init_calib_complete), .dir_error(dir_error),
.job_out_done(job_out_done), .data_ready_n(data_ready_n),
.job_in_valid(job_in_valid), .job_in_ready(job_in_ready),
.job_in_x_base(job_in_x_base), .job_in_w_base(job_in_w_base),
.job_in_n_tiles(job_in_n_tiles), .job_in_result_addr(job_in_result_addr),
.job_in_node_id(job_in_node_id),
.mem_req(mem_req), .mem_wr(mem_wr), .mem_addr(mem_addr),
.mem_wdata(mem_wdata), .mem_lb_n(mem_lb_n), .mem_ub_n(mem_ub_n),
.mem_rdata(mem_rdata), .mem_ready(mem_ready),
.flash_xfer_active(flash_xfer_active), .flash_byte_req(flash_byte_req),
.flash_byte_wdata(flash_byte_wdata), .flash_byte_rdata(flash_byte_rdata),
.flash_byte_done(flash_byte_done),
.soft_rst_pulse(soft_rst_pulse)
);
flash_spi_master u_flash (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.xfer_active(flash_xfer_active), .byte_req(flash_byte_req),
.byte_wdata(flash_byte_wdata), .byte_rdata(flash_byte_rdata), .byte_done(flash_byte_done), .busy(),
.flash_cs_n(flash_cs_n), .flash_mosi(flash_mosi), .flash_miso(flash_miso)
);
host_mem_bridge #(
.BURST_LEN(BURST_LEN), .ADDR_WIDTH(MEM_ADDR_WIDTH)
) u_host_bridge (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.mem_req(mem_req), .mem_wr(mem_wr), .mem_addr(mem_addr),
.mem_wdata(mem_wdata), .mem_lb_n(mem_lb_n), .mem_ub_n(mem_ub_n),
.mem_rdata(mem_rdata), .mem_ready(mem_ready),
.req_active(req_active[HOST_SLOT]), .req_grant(req_grant[HOST_SLOT]),
.req_req(req_req[HOST_SLOT]), .req_wr(req_wr[HOST_SLOT]),
.req_addr(req_addr[HOST_SLOT*MEM_ADDR_WIDTH +: MEM_ADDR_WIDTH]),
.req_wdata(req_wdata[HOST_SLOT*32*BURST_LEN +: 32*BURST_LEN]),
.req_wmask(req_wmask[HOST_SLOT*4*BURST_LEN +: 4*BURST_LEN]),
.req_rdata(req_rdata[HOST_SLOT*32*BURST_LEN +: 32*BURST_LEN]),
.req_ready(req_ready[HOST_SLOT]), .req_busy(req_busy[HOST_SLOT])
);
// ---- 2x systolic_group.v, each: 1 arbiter slot for its own
// weight-fetch (slots 0..N_GROUPS-1), 4 arbiter slots for its own
// 4 PEs' activation-fetch+writeback (slots N_GROUPS+4g ..
// N_GROUPS+4g+3) ----
genvar gg;
generate
for (gg = 0; gg < N_GROUPS; gg = gg + 1) begin : GEN_GROUP
localparam PE_BASE = N_GROUPS + gg*4;
systolic_group #(
.DATA_WIDTH(DATA_WIDTH), .P_IN(P_IN), .ACC_WIDTH(ACC_WIDTH),
.BURST_LEN(BURST_LEN), .ADDR_WIDTH(JOB_ADDR_WIDTH), .LAYER_BYTES(LAYER_BYTES)
) u_group (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.job_start(group_job_start[gg]),
.w_base(group_w_base[gg*JOB_ADDR_WIDTH +: JOB_ADDR_WIDTH]),
.n_tiles(group_n_tiles[gg*16 +: 16]),
.pe_x_base_a(group_pe_x_base_a[gg*4*JOB_ADDR_WIDTH +: 4*JOB_ADDR_WIDTH]),
.pe_x_base_b(group_pe_x_base_b[gg*4*JOB_ADDR_WIDTH +: 4*JOB_ADDR_WIDTH]),
.pe_result_addr_a(group_pe_result_addr_a[gg*4*JOB_ADDR_WIDTH +: 4*JOB_ADDR_WIDTH]),
.pe_result_addr_b(group_pe_result_addr_b[gg*4*JOB_ADDR_WIDTH +: 4*JOB_ADDR_WIDTH]),
.pe_node_id_a(group_pe_node_id_a[gg*4*16 +: 4*16]),
.pe_node_id_b(group_pe_node_id_b[gg*4*16 +: 4*16]),
.job_done(group_job_done[gg]),
.pe_result_data_a(), .pe_result_data_b(),
.pe_result_node_id_a(), .pe_result_node_id_b(),
.pe_result_addr_a_out(), .pe_result_addr_b_out(),
.mem_active(req_active[gg]), .mem_grant(req_grant[gg]),
.ctrl_req(req_req[gg]), .ctrl_wr(req_wr[gg]),
.ctrl_addr(req_addr[gg*MEM_ADDR_WIDTH +: MEM_ADDR_WIDTH]),
.ctrl_wdata(req_wdata[gg*32*BURST_LEN +: 32*BURST_LEN]),
.ctrl_wmask(req_wmask[gg*4*BURST_LEN +: 4*BURST_LEN]),
.ctrl_rdata(req_rdata[gg*32*BURST_LEN +: 32*BURST_LEN]),
.ctrl_ready(req_ready[gg]), .ctrl_busy(req_busy[gg]),
.pe_mem_active(req_active[PE_BASE +: 4]), .pe_mem_grant(req_grant[PE_BASE +: 4]),
.pe_ctrl_req(req_req[PE_BASE +: 4]), .pe_ctrl_wr(req_wr[PE_BASE +: 4]),
.pe_ctrl_addr(req_addr[PE_BASE*MEM_ADDR_WIDTH +: 4*MEM_ADDR_WIDTH]),
.pe_ctrl_wdata(req_wdata[PE_BASE*32*BURST_LEN +: 4*32*BURST_LEN]),
.pe_ctrl_wmask(req_wmask[PE_BASE*4*BURST_LEN +: 4*4*BURST_LEN]),
.pe_ctrl_rdata(req_rdata[PE_BASE*32*BURST_LEN +: 4*32*BURST_LEN]),
.pe_ctrl_ready(req_ready[PE_BASE +: 4]), .pe_ctrl_busy(req_busy[PE_BASE +: 4])
);
end
endgenerate
endmodule
hardware/v3/sim/tb_n8_system_ddr3.v
+521
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`timescale 1ps/100fs
// ============================================================
// EXP-0096 -- real FUNCTIONAL verification of the N=8 hybrid systolic
// system (n8_system_ddr3_top.v), the real, definitive deployment
// target -- directly adapted from tb_n16_system_ddr3.v's own real
// methodology (EXP-0092/0094), scaled down to N_GROUPS=2 instead of 4.
// Exists specifically because EXP-0095's own real P&R closure at N=8
// (WNS=0.000ns, 0 failing endpoints) was measured via a `-generic
// N_GROUPS=2` override against n16_system_ddr3_top.v, WITHOUT a
// dedicated functional test at that specific N -- this closes that
// real, disclosed gap before trusting N=8 as a real, deployable
// signoff.
//
// STRUCTURE: identical real harness to tb_n16_system_ddr3.v (real 2-
// chip 32-bit DDR3 model via WireDelay, real mig_7series_0_mig with
// SIM_BYPASS_INIT_CAL="FAST", the pre_active-muxed direct preload path,
// weight_byte/input_byte golden functions, sdram_write_burst task) --
// only N_GROUPS/N_PES/M change (2 groups instead of 4, 16 positions
// instead of 32, filling every one of the 2 groups x 4 PEs x 2 lanes
// exactly once), plus neural_director_grouped.v + sdram_arbiter_hier.v
// + 2x systolic_group.v instead of 4x (host slot tied off inactive,
// same real precedent as tb_n2_system_ddr3.v never instantiating
// spi_host_bridge_v3.v).
// ============================================================
module tb;
localparam CLKIN_PERIOD = 3225; // ps, this project's real, CLOSED MIG config (EXP-0086)
localparam REFCLK_FREQ = 200.0; // MHz
localparam real REFCLK_PERIOD = (1000000.0/(2*REFCLK_FREQ));
localparam RESET_PERIOD = 200000; // ps
localparam DATA_WIDTH = 8;
localparam P_IN = 8;
localparam ACC_WIDTH = 32;
localparam ADDR_WIDTH = 26; // this project's byte-address convention (Director/systolic_group)
localparam MIG_ADDR_WIDTH = 25; // word-address convention (BURST_LEN=8) at the arbiter/adapter
localparam BURST_LEN = 8;
localparam N_INPUTS = 128;
localparam N_TILES = N_INPUTS/P_IN;
localparam LAYER_BYTES = N_INPUTS;
localparam WORDS_PER_LAYER = LAYER_BYTES/2;
localparam N_GROUPS = 2;
localparam N_PES = N_GROUPS*4; // 8
localparam QUEUE_DEPTH = 16;
localparam L = 1; // one shared layer -- simplest real addressing that still
localparam M = 16; // exercises every one of the 2 groups x 4 PEs x 2 lanes exactly once
// ---- clock/reset (mirrors tb_n2_system_ddr3.v's own proven pattern) ----
reg sys_rst_n;
wire sys_rst = sys_rst_n;
reg sys_clk_i = 1'b0;
always #(CLKIN_PERIOD/2.0) sys_clk_i = ~sys_clk_i;
wire sys_clk_p = sys_clk_i;
wire sys_clk_n = ~sys_clk_i;
reg clk_ref_i = 1'b0;
always #REFCLK_PERIOD clk_ref_i = ~clk_ref_i;
wire clk_ref_p = clk_ref_i;
wire clk_ref_n = ~clk_ref_i;
initial begin
sys_rst_n = 1'b0;
#RESET_PERIOD sys_rst_n = 1'b1;
end
// ---- real DDR3 pins + model (identical to tb_n2_system_ddr3.v) ----
wire ddr3_reset_n;
wire [31:0] ddr3_dq_fpga;
wire [3:0] ddr3_dqs_p_fpga, ddr3_dqs_n_fpga;
wire [13:0] ddr3_addr_fpga;
wire [2:0] ddr3_ba_fpga;
wire ddr3_ras_n_fpga, ddr3_cas_n_fpga, ddr3_we_n_fpga;
wire [0:0] ddr3_cke_fpga, ddr3_ck_p_fpga, ddr3_ck_n_fpga, ddr3_cs_n_fpga;
wire [3:0] ddr3_dm_fpga;
wire [0:0] ddr3_odt_fpga;
wire [31:0] ddr3_dq_sdram;
reg [13:0] ddr3_addr_sdram;
reg [2:0] ddr3_ba_sdram;
reg ddr3_ras_n_sdram, ddr3_cas_n_sdram, ddr3_we_n_sdram;
wire [0:0] ddr3_cs_n_sdram;
wire [0:0] ddr3_odt_sdram;
reg [0:0] ddr3_cke_sdram;
wire [3:0] ddr3_dm_sdram;
wire [3:0] ddr3_dqs_p_sdram, ddr3_dqs_n_sdram;
reg [0:0] ddr3_ck_p_sdram, ddr3_ck_n_sdram;
reg [0:0] ddr3_cs_n_sdram_tmp;
reg [3:0] ddr3_dm_sdram_tmp;
reg [0:0] ddr3_odt_sdram_tmp;
always @(*) begin
ddr3_ck_p_sdram <= ddr3_ck_p_fpga;
ddr3_ck_n_sdram <= ddr3_ck_n_fpga;
ddr3_addr_sdram <= ddr3_addr_fpga;
ddr3_ba_sdram <= ddr3_ba_fpga;
ddr3_ras_n_sdram <= ddr3_ras_n_fpga;
ddr3_cas_n_sdram <= ddr3_cas_n_fpga;
ddr3_we_n_sdram <= ddr3_we_n_fpga;
ddr3_cke_sdram <= ddr3_cke_fpga;
end
always @(*) ddr3_cs_n_sdram_tmp <= ddr3_cs_n_fpga;
assign ddr3_cs_n_sdram = ddr3_cs_n_sdram_tmp;
always @(*) ddr3_dm_sdram_tmp <= ddr3_dm_fpga;
assign ddr3_dm_sdram = ddr3_dm_sdram_tmp;
always @(*) ddr3_odt_sdram_tmp <= ddr3_odt_fpga;
assign ddr3_odt_sdram = ddr3_odt_sdram_tmp;
genvar dqwd;
generate
for (dqwd = 0; dqwd < 32; dqwd = dqwd + 1) begin : dq_delay
WireDelay #(.Delay_g(0.00), .Delay_rd(0.00), .ERR_INSERT("OFF")) u_delay_dq (
.A(ddr3_dq_fpga[dqwd]), .B(ddr3_dq_sdram[dqwd]),
.reset(sys_rst_n), .phy_init_done(init_calib_complete)
);
end
endgenerate
genvar dqswd;
generate
for (dqswd = 0; dqswd < 4; dqswd = dqswd + 1) begin : dqs_delay
WireDelay #(.Delay_g(0.00), .Delay_rd(0.00), .ERR_INSERT("OFF")) u_delay_dqs_p (
.A(ddr3_dqs_p_fpga[dqswd]), .B(ddr3_dqs_p_sdram[dqswd]),
.reset(sys_rst_n), .phy_init_done(init_calib_complete)
);
WireDelay #(.Delay_g(0.00), .Delay_rd(0.00), .ERR_INSERT("OFF")) u_delay_dqs_n (
.A(ddr3_dqs_n_fpga[dqswd]), .B(ddr3_dqs_n_sdram[dqswd]),
.reset(sys_rst_n), .phy_init_done(init_calib_complete)
);
end
endgenerate
genvar ci;
generate
for (ci = 0; ci < 2; ci = ci + 1) begin : gen_mem
ddr3_model u_comp_ddr3 (
.rst_n(ddr3_reset_n), .ck(ddr3_ck_p_sdram), .ck_n(ddr3_ck_n_sdram),
.cke(ddr3_cke_sdram[0]), .cs_n(ddr3_cs_n_sdram[0]),
.ras_n(ddr3_ras_n_sdram), .cas_n(ddr3_cas_n_sdram), .we_n(ddr3_we_n_sdram),
.dm_tdqs(ddr3_dm_sdram[2*ci +: 2]), .ba(ddr3_ba_sdram), .addr(ddr3_addr_sdram),
.dq(ddr3_dq_sdram[16*ci +: 16]),
.dqs(ddr3_dqs_p_sdram[2*ci +: 2]), .dqs_n(ddr3_dqs_n_sdram[2*ci +: 2]),
.tdqs_n(), .odt(ddr3_odt_sdram[0])
);
end
endgenerate
wire [27:0] app_addr;
wire [2:0] app_cmd;
wire app_en, app_rdy;
wire [127:0] app_wdf_data;
wire app_wdf_end;
wire [15:0] app_wdf_mask;
wire app_wdf_wren, app_wdf_rdy;
wire [127:0] app_rd_data;
wire app_rd_data_end, app_rd_data_valid;
wire ui_clk, ui_clk_sync_rst, init_calib_complete;
mig_7series_0_mig #(
.SIM_BYPASS_INIT_CAL("FAST")
) u_mig (
.ddr3_dq(ddr3_dq_fpga), .ddr3_dqs_n(ddr3_dqs_n_fpga), .ddr3_dqs_p(ddr3_dqs_p_fpga),
.ddr3_addr(ddr3_addr_fpga), .ddr3_ba(ddr3_ba_fpga),
.ddr3_ras_n(ddr3_ras_n_fpga), .ddr3_cas_n(ddr3_cas_n_fpga), .ddr3_we_n(ddr3_we_n_fpga),
.ddr3_reset_n(ddr3_reset_n),
.ddr3_ck_p(ddr3_ck_p_fpga), .ddr3_ck_n(ddr3_ck_n_fpga),
.ddr3_cke(ddr3_cke_fpga), .ddr3_cs_n(ddr3_cs_n_fpga),
.ddr3_dm(ddr3_dm_fpga), .ddr3_odt(ddr3_odt_fpga),
.sys_clk_p(sys_clk_p), .sys_clk_n(sys_clk_n), .clk_ref_p(clk_ref_p), .clk_ref_n(clk_ref_n),
.app_addr(app_addr), .app_cmd(app_cmd), .app_en(app_en),
.app_wdf_data(app_wdf_data), .app_wdf_end(app_wdf_end),
.app_wdf_mask(app_wdf_mask), .app_wdf_wren(app_wdf_wren),
.app_rd_data(app_rd_data), .app_rd_data_end(app_rd_data_end),
.app_rd_data_valid(app_rd_data_valid), .app_rdy(app_rdy), .app_wdf_rdy(app_wdf_rdy),
.app_sr_req(1'b0), .app_ref_req(1'b0), .app_zq_req(1'b0),
.app_sr_active(), .app_ref_ack(), .app_zq_ack(),
.ui_clk(ui_clk), .ui_clk_sync_rst(ui_clk_sync_rst),
.init_calib_complete(init_calib_complete),
.device_temp(),
.sys_rst(sys_rst)
);
// ---- preload path: direct access to mig_native_adapter.v,
// bypassing the arbiter, exactly like tb_n2_system_ddr3.v's own
// "pre_active" mux -- used only before job submission begins. ----
reg pre_active;
reg pre_req, pre_wr;
reg [MIG_ADDR_WIDTH-1:0] pre_addr;
reg [32*BURST_LEN-1:0] pre_wdata;
wire adp_req, adp_wr;
wire [MIG_ADDR_WIDTH-1:0] adp_addr;
wire [32*BURST_LEN-1:0] adp_wdata;
wire [4*BURST_LEN-1:0] adp_wmask;
wire [32*BURST_LEN-1:0] adp_rdata;
wire adp_ready, adp_busy;
wire arb_ctrl_req_o, arb_ctrl_wr_o;
wire [MIG_ADDR_WIDTH-1:0] arb_ctrl_addr_o;
wire [32*BURST_LEN-1:0] arb_ctrl_wdata_o;
wire [4*BURST_LEN-1:0] arb_ctrl_wmask_o;
assign adp_req = pre_active ? pre_req : arb_ctrl_req_o;
assign adp_wr = pre_active ? pre_wr : arb_ctrl_wr_o;
assign adp_addr = pre_active ? pre_addr : arb_ctrl_addr_o;
assign adp_wdata = pre_active ? pre_wdata : arb_ctrl_wdata_o;
assign adp_wmask = pre_active ? {(4*BURST_LEN){1'b0}} : arb_ctrl_wmask_o;
mig_native_adapter #(.BURST_LEN(BURST_LEN), .ADDR_WIDTH(MIG_ADDR_WIDTH)) u_adapter (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.req(adp_req), .wr(adp_wr), .addr(adp_addr), .wdata(adp_wdata), .wmask(adp_wmask),
.rdata(adp_rdata), .ready(adp_ready), .busy(adp_busy),
.app_addr(app_addr), .app_cmd(app_cmd), .app_en(app_en), .app_rdy(app_rdy),
.app_wdf_data(app_wdf_data), .app_wdf_end(app_wdf_end), .app_wdf_mask(app_wdf_mask),
.app_wdf_wren(app_wdf_wren), .app_wdf_rdy(app_wdf_rdy),
.app_rd_data(app_rd_data), .app_rd_data_end(app_rd_data_end), .app_rd_data_valid(app_rd_data_valid)
);
// EXP-0086 fix (see tb_n2_system_ddr3.v): plain intermediate 8-bit
// reg instead of SV-only `8'(expr)` sized-cast syntax.
function automatic signed [7:0] weight_byte(input integer li, input integer t);
reg [7:0] tmp;
begin
tmp = (li*17 + t*29 + 13) & 8'hFF;
weight_byte = $signed(tmp);
end
endfunction
function automatic signed [7:0] input_byte(input integer li, input integer pos, input integer t);
reg [7:0] tmp;
begin
tmp = (li*11 + pos*41 + t*7 + 3) & 8'hFF;
input_byte = $signed(tmp);
end
endfunction
task automatic sdram_write_burst(input [MIG_ADDR_WIDTH-1:0] word_addr, input [32*BURST_LEN-1:0] data);
begin
@(posedge ui_clk); while (adp_busy) @(posedge ui_clk);
pre_req = 1'b1; pre_wr = 1'b1; pre_addr = word_addr; pre_wdata = data;
@(posedge ui_clk); pre_req = 1'b0;
while (!adp_ready) @(posedge ui_clk);
end
endtask
task automatic preload_sdram_layers;
integer li, bi, wb, tt;
reg [32*BURST_LEN-1:0] burst_data;
begin
for (li = 0; li < L; li = li + 1) begin
for (bi = 0; bi < (LAYER_BYTES/(4*BURST_LEN)); bi = bi + 1) begin
for (wb = 0; wb < BURST_LEN; wb = wb + 1) begin
tt = bi*(4*BURST_LEN) + wb*4;
burst_data[wb*32 +: 32] = {weight_byte(li, tt+3), weight_byte(li, tt+2),
weight_byte(li, tt+1), weight_byte(li, tt)};
end
sdram_write_burst((li*WORDS_PER_LAYER + bi*BURST_LEN), burst_data);
end
end
end
endtask
localparam [MIG_ADDR_WIDTH-1:0] ACT_MEM_BASE = 25'h10000;
function automatic [ADDR_WIDTH-1:0] act_x_base(input integer li, input integer pos);
act_x_base = {{(ADDR_WIDTH-MIG_ADDR_WIDTH){1'b0}}, ACT_MEM_BASE} + (li*M + pos) * ((N_TILES/4)*BURST_LEN);
endfunction
task automatic preload_ddr3_activations;
integer li, pos, tq, qi;
reg [32*BURST_LEN-1:0] burst_data;
reg [ADDR_WIDTH-1:0] base;
begin
for (li = 0; li < L; li = li + 1) begin
for (pos = 0; pos < M; pos = pos + 1) begin
base = act_x_base(li, pos);
for (tq = 0; tq < N_TILES/4; tq = tq + 1) begin
burst_data = {(32*BURST_LEN){1'b0}};
for (qi = 0; qi < 4; qi = qi + 1)
burst_data[qi*64 +: 64] = {input_byte(li, pos, (4*tq+qi)*P_IN + 7), input_byte(li, pos, (4*tq+qi)*P_IN + 6),
input_byte(li, pos, (4*tq+qi)*P_IN + 5), input_byte(li, pos, (4*tq+qi)*P_IN + 4),
input_byte(li, pos, (4*tq+qi)*P_IN + 3), input_byte(li, pos, (4*tq+qi)*P_IN + 2),
input_byte(li, pos, (4*tq+qi)*P_IN + 1), input_byte(li, pos, (4*tq+qi)*P_IN + 0)};
sdram_write_burst(base[MIG_ADDR_WIDTH-1:0] + tq*BURST_LEN, burst_data);
end
end
end
end
endtask
// ---- neural_director_grouped.v ----
reg job_in_valid;
wire job_in_ready;
reg [ADDR_WIDTH-1:0] job_in_x_base, job_in_w_base, job_in_result_addr;
reg [15:0] job_in_n_tiles, job_in_node_id;
wire [N_GROUPS-1:0] group_job_start;
wire [ADDR_WIDTH*N_GROUPS-1:0] group_w_base;
wire [16*N_GROUPS-1:0] group_n_tiles;
wire [4*ADDR_WIDTH*N_GROUPS-1:0] group_pe_x_base_a, group_pe_x_base_b;
wire [4*ADDR_WIDTH*N_GROUPS-1:0] group_pe_result_addr_a, group_pe_result_addr_b;
wire [4*16*N_GROUPS-1:0] group_pe_node_id_a, group_pe_node_id_b;
wire [N_GROUPS-1:0] group_job_done;
wire job_out_done;
wire [$clog2(N_GROUPS)-1:0] job_out_group;
wire [3:0] dir_state;
wire dir_error;
wire queue_empty;
neural_director_grouped #(
.ADDR_WIDTH(ADDR_WIDTH), .N_GROUPS(N_GROUPS), .QUEUE_DEPTH(QUEUE_DEPTH)
) u_dir (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.job_in_valid(job_in_valid), .job_in_ready(job_in_ready),
.job_in_x_base(job_in_x_base), .job_in_w_base(job_in_w_base),
.job_in_n_tiles(job_in_n_tiles), .job_in_result_addr(job_in_result_addr),
.job_in_node_id(job_in_node_id),
.group_job_start(group_job_start), .group_w_base(group_w_base), .group_n_tiles(group_n_tiles),
.group_pe_x_base_a(group_pe_x_base_a), .group_pe_x_base_b(group_pe_x_base_b),
.group_pe_result_addr_a(group_pe_result_addr_a), .group_pe_result_addr_b(group_pe_result_addr_b),
.group_pe_node_id_a(group_pe_node_id_a), .group_pe_node_id_b(group_pe_node_id_b),
.group_job_done(group_job_done),
.job_out_done(job_out_done), .job_out_group(job_out_group),
.dir_state(dir_state), .dir_error(dir_error), .queue_empty(queue_empty)
);
// ---- real, hierarchical 2-level arbiter (EXP-0094): 2 groups' own
// weight-fetch + 8 PEs' own activation-fetch+writeback + 1 host
// slot, matching n8_system_ddr3_top.v's own real, fixed topology
// exactly -- sdram_arbiter_hier.v always includes a host slot, so
// this testbench ties it off inactive (doesn't instantiate
// host_mem_bridge.v at all, same real precedent as
// tb_n2_system_ddr3.v never instantiating spi_host_bridge_v3.v). ----
localparam NUM_REQ = N_GROUPS + N_PES + 1; // 2 + 8 + 1 = 11
localparam HOST_SLOT = NUM_REQ - 1; // 10, tied off inactive below
wire [NUM_REQ-1:0] req_active, req_grant, req_req, req_wr;
wire [NUM_REQ-1:0] req_ready, req_busy;
wire [NUM_REQ*MIG_ADDR_WIDTH-1:0] req_addr;
wire [NUM_REQ*32*BURST_LEN-1:0] req_wdata;
wire [NUM_REQ*4*BURST_LEN-1:0] req_wmask;
wire [NUM_REQ*32*BURST_LEN-1:0] req_rdata;
assign req_active[HOST_SLOT] = 1'b0;
assign req_req[HOST_SLOT] = 1'b0;
assign req_wr[HOST_SLOT] = 1'b0;
assign req_addr[HOST_SLOT*MIG_ADDR_WIDTH +: MIG_ADDR_WIDTH] = {MIG_ADDR_WIDTH{1'b0}};
assign req_wdata[HOST_SLOT*32*BURST_LEN +: 32*BURST_LEN] = {(32*BURST_LEN){1'b0}};
assign req_wmask[HOST_SLOT*4*BURST_LEN +: 4*BURST_LEN] = {(4*BURST_LEN){1'b0}};
sdram_arbiter_hier #(
.N_GROUPS(N_GROUPS), .PES_PER_GROUP(4), .ADDR_WIDTH(MIG_ADDR_WIDTH), .BURST_LEN(BURST_LEN)
) u_arb (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.req_active(req_active), .req_grant(req_grant),
.req_req(req_req), .req_wr(req_wr), .req_addr(req_addr),
.req_wdata(req_wdata), .req_wmask(req_wmask),
.req_rdata(req_rdata), .req_ready(req_ready), .req_busy(req_busy),
.ctrl_req(arb_ctrl_req_o), .ctrl_wr(arb_ctrl_wr_o), .ctrl_addr(arb_ctrl_addr_o),
.ctrl_wdata(arb_ctrl_wdata_o), .ctrl_wmask(arb_ctrl_wmask_o),
.ctrl_rdata(adp_rdata), .ctrl_ready(adp_ready), .ctrl_busy(adp_busy)
);
wire [4*DATA_WIDTH*N_GROUPS-1:0] all_pe_result_data_a, all_pe_result_data_b;
wire [4*16*N_GROUPS-1:0] all_pe_result_node_id_a, all_pe_result_node_id_b;
genvar gg;
generate
for (gg = 0; gg < N_GROUPS; gg = gg + 1) begin : GEN_GROUP
localparam PE_BASE = N_GROUPS + gg*4;
systolic_group #(
.DATA_WIDTH(DATA_WIDTH), .P_IN(P_IN), .ACC_WIDTH(ACC_WIDTH),
.BURST_LEN(BURST_LEN), .ADDR_WIDTH(ADDR_WIDTH), .LAYER_BYTES(LAYER_BYTES)
) u_group (
.clk(ui_clk), .rst(ui_clk_sync_rst),
.job_start(group_job_start[gg]),
.w_base(group_w_base[gg*ADDR_WIDTH +: ADDR_WIDTH]),
.n_tiles(group_n_tiles[gg*16 +: 16]),
.pe_x_base_a(group_pe_x_base_a[gg*4*ADDR_WIDTH +: 4*ADDR_WIDTH]),
.pe_x_base_b(group_pe_x_base_b[gg*4*ADDR_WIDTH +: 4*ADDR_WIDTH]),
.pe_result_addr_a(group_pe_result_addr_a[gg*4*ADDR_WIDTH +: 4*ADDR_WIDTH]),
.pe_result_addr_b(group_pe_result_addr_b[gg*4*ADDR_WIDTH +: 4*ADDR_WIDTH]),
.pe_node_id_a(group_pe_node_id_a[gg*4*16 +: 4*16]),
.pe_node_id_b(group_pe_node_id_b[gg*4*16 +: 4*16]),
.job_done(group_job_done[gg]),
.pe_result_data_a(all_pe_result_data_a[gg*4*DATA_WIDTH +: 4*DATA_WIDTH]),
.pe_result_data_b(all_pe_result_data_b[gg*4*DATA_WIDTH +: 4*DATA_WIDTH]),
.pe_result_node_id_a(all_pe_result_node_id_a[gg*4*16 +: 4*16]),
.pe_result_node_id_b(all_pe_result_node_id_b[gg*4*16 +: 4*16]),
.pe_result_addr_a_out(), .pe_result_addr_b_out(),
.mem_active(req_active[gg]), .mem_grant(req_grant[gg]),
.ctrl_req(req_req[gg]), .ctrl_wr(req_wr[gg]),
.ctrl_addr(req_addr[gg*MIG_ADDR_WIDTH +: MIG_ADDR_WIDTH]),
.ctrl_wdata(req_wdata[gg*32*BURST_LEN +: 32*BURST_LEN]),
.ctrl_wmask(req_wmask[gg*4*BURST_LEN +: 4*BURST_LEN]),
.ctrl_rdata(req_rdata[gg*32*BURST_LEN +: 32*BURST_LEN]),
.ctrl_ready(req_ready[gg]), .ctrl_busy(req_busy[gg]),
.pe_mem_active(req_active[PE_BASE +: 4]), .pe_mem_grant(req_grant[PE_BASE +: 4]),
.pe_ctrl_req(req_req[PE_BASE +: 4]), .pe_ctrl_wr(req_wr[PE_BASE +: 4]),
.pe_ctrl_addr(req_addr[PE_BASE*MIG_ADDR_WIDTH +: 4*MIG_ADDR_WIDTH]),
.pe_ctrl_wdata(req_wdata[PE_BASE*32*BURST_LEN +: 4*32*BURST_LEN]),
.pe_ctrl_wmask(req_wmask[PE_BASE*4*BURST_LEN +: 4*4*BURST_LEN]),
.pe_ctrl_rdata(req_rdata[PE_BASE*32*BURST_LEN +: 4*32*BURST_LEN]),
.pe_ctrl_ready(req_ready[PE_BASE +: 4]), .pe_ctrl_busy(req_busy[PE_BASE +: 4])
);
end
endgenerate
integer errors, tests, completions, n_expected;
reg [15:0] expect_node [0:15];
reg signed [7:0] expect_val [0:15];
function automatic signed [7:0] golden_result(input integer li, input integer pos);
integer t, acc;
reg signed [7:0] r;
begin
acc = 0;
for (t = 0; t < N_INPUTS; t = t + 1)
acc = acc + (input_byte(li, pos, t) * weight_byte(li, t));
if (acc <= 0) r = 0; else if (acc > 127) r = 8'sd127; else r = acc[7:0];
golden_result = r;
end
endfunction
task automatic check_completion(input integer idx, input [15:0] nid, input signed [7:0] val);
integer ei, found;
begin
found = 0;
for (ei = 0; ei < n_expected; ei = ei + 1) begin
if (expect_node[ei] === nid && !found) begin
found = 1;
tests = tests + 1;
if (expect_val[ei] !== val) begin
$display("FAIL idx=%0d node_id=%0d: got=%0d expected=%0d", idx, nid, $signed(val), $signed(expect_val[ei]));
errors = errors + 1;
end else begin
$display("PASS idx=%0d node_id=%0d: result=%0d", idx, nid, $signed(val));
end
end
end
end
endtask
integer gg2, pp2;
always @(posedge ui_clk) begin
if (!ui_clk_sync_rst) begin
for (gg2 = 0; gg2 < N_GROUPS; gg2 = gg2 + 1) begin
if (group_job_done[gg2]) begin
completions = completions + 8;
for (pp2 = 0; pp2 < 4; pp2 = pp2 + 1) begin
check_completion(gg2*4+pp2,
all_pe_result_node_id_a[(gg2*4+pp2)*16 +: 16],
all_pe_result_data_a[(gg2*4+pp2)*DATA_WIDTH +: DATA_WIDTH]);
check_completion(gg2*4+pp2,
all_pe_result_node_id_b[(gg2*4+pp2)*16 +: 16],
all_pe_result_data_b[(gg2*4+pp2)*DATA_WIDTH +: DATA_WIDTH]);
end
end
end
end
end
// real, root-caused fix (EXP-0090, CLAUDE.md): driving stimulus on
// @(posedge clk) races the DUT's own posedge-sampling always block
// when called back-to-back with zero real simulated gap -- drive on
// @(negedge ui_clk) instead.
task automatic submit_job(
input [ADDR_WIDTH-1:0] xb, input [ADDR_WIDTH-1:0] wb,
input [15:0] nt, input [ADDR_WIDTH-1:0] resaddr, input [15:0] nid
);
begin
@(negedge ui_clk);
job_in_valid = 1'b1; job_in_x_base = xb; job_in_w_base = wb;
job_in_n_tiles = nt; job_in_result_addr = resaddr; job_in_node_id = nid;
@(negedge ui_clk);
job_in_valid = 1'b0;
end
endtask
integer pp_i, wd;
initial begin
errors = 0; tests = 0; completions = 0; n_expected = 0;
pre_active = 1'b1; pre_req = 0; pre_wr = 0; pre_addr = 0; pre_wdata = 0;
job_in_valid = 0; job_in_x_base = 0; job_in_w_base = 0;
job_in_n_tiles = 0; job_in_result_addr = 0; job_in_node_id = 0;
$display("=== waiting for real DDR3 init_calib_complete ===");
wait (init_calib_complete);
$display("=== calibration done at time %0t ===", $time);
repeat (10) @(posedge ui_clk);
$display("=== preload SDRAM with %0d resident-filter weight set(s) ===", L);
preload_sdram_layers;
$display("=== preload SDRAM with real activation data (%0d positions) ===", M);
preload_ddr3_activations;
@(posedge ui_clk);
pre_active = 1'b0;
repeat (5) @(posedge ui_clk);
$display("=== N=8 hybrid systolic system on REAL DDR3: submitting %0d positions (2 groups x 4 PEs x 2 lanes) ===", M);
for (pp_i = 0; pp_i < M; pp_i = pp_i + 1) begin
submit_job(act_x_base(0, pp_i), {ADDR_WIDTH{1'b0}}, N_TILES[15:0],
26'h9000 + pp_i, pp_i[15:0]);
expect_node[n_expected] = pp_i[15:0];
expect_val[n_expected] = golden_result(0, pp_i);
n_expected = n_expected + 1;
end
wd = 0;
while (completions < n_expected && wd < 400000) begin
@(posedge ui_clk);
wd = wd + 1;
end
if (completions < n_expected) begin
$display("FAIL: only %0d/%0d position-results completed within watchdog", completions, n_expected);
errors = errors + 1;
end
$display("=== %0d/%0d tests, %0d errors, %0d/%0d positions completed ===", tests-errors, tests, errors, completions, n_expected);
if (errors == 0 && completions == n_expected) $display("ALL TESTS PASSED (tb_n8_system_ddr3, REAL DDR3)");
$finish;
end
endmodule