secs-gem/COMPLIANCE.md

SECS/GEM Compliance

A per-capability accounting against SEMI E5 (SECS-II), E30 (GEM), and E37 (HSMS).

Status. Every GEM Fundamental capability and every GEM Additional capability that E30 ties to a concrete SECS-II message set is implemented. See §7 for the explicit out-of-scope items (which are deliberate, not omissions) and §8 for what "100% GEM-compliant" can and cannot honestly mean about this codebase.

Legend:

• ✅ Full — implemented to the spec; round-trip-tested.
• 🟡 Partial — implemented in the demo path with a documented limitation.
• ⬜ Out of scope — deliberately not implemented; reason given.

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1. E37 — HSMS transport

Item	Status	Spec ref	Notes
TCP transport	✅	E37 §6	hsms::Connection over standalone Asio.
4-byte length prefix + 10-byte header	✅	E37 §8.2	hsms::Frame::encode/decode.
Session ID, byte2, byte3, PType, SType, system-bytes	✅	E37 §8.3	hsms::Header.
Select.req / .rsp	✅	E37 §7.2	SType 1/2; SelectStatus enum (0–3).
Deselect.req / .rsp	✅	E37 §7.4	SType 3/4; DeselectStatus enum (0–2).
Linktest.req / .rsp	✅	E37 §7.5	SType 5/6; periodic interval configurable.
Separate.req	✅	E37 §7.6	SType 9; graceful close after flush.
Reject.req	✅	E37 §7.7	Emitted on data-while-NOT-SELECTED.
Connection state machine NOT-CONNECTED → NOT-SELECTED → SELECTED	✅	E37 §6.3	Both Active and Passive modes.
T3 reply timeout	✅	E37 §10	Per-transaction steady_timer.
T5 connect separation timeout	✅	E37 §10	Client::schedule_retry.
T6 control transaction timeout	✅	E37 §10	One concurrent control transaction.
T7 not-selected timeout (passive)	✅	E37 §10	Armed on connect / on Deselect.req.
T8 intercharacter timeout	✅	E37 §10	Bounds the payload read after length prefix.
HSMS-SS (single-session)	✅	E37 §11	The codebase is HSMS-SS only by design.
HSMS-GS (general-session)	⬜	E37 §11	Multi-session; out of scope for this revision.

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2. E5 — SECS-II encoding

Item	Status	Spec ref	Notes
Format byte + 1/2/3 length bytes	✅	E5 §9	secs2::encode_into.
List (L)	✅	E5 §9.3	Recursive.
ASCII (A)	✅	E5 §9.5
Binary (B)	✅	E5 §9.5
Boolean (BOOLEAN)	✅	E5 §9.5
U1, U2, U4, U8 (big-endian)	✅	E5 §9.5
I1, I2, I4, I8 (big-endian, two's complement)	✅	E5 §9.5
F4, F8 (IEEE 754 big-endian)	✅	E5 §9.5	bit-cast round-trip.
JIS-8 / C2 (Unicode)	⬜	E5 §9.5	Rarely used in modern fabs.
SML text rendering	✅	E5 Annex	secs2::to_sml.

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3. E30 — GEM Fundamental capabilities (§5.2)

Fundamental Capability	Status	Spec ref	Messages	Notes
State models	✅	E30 §6.2	—	E30 control state machine (5 states) + HSMS communication state machine.
Equipment Processing States	✅	E30 §6.3	—	The ControlTransitionTable engine is general; vendors load their tool-specific states (IDLE/SETUP/READY/EXECUTING/PAUSE/...) via a second YAML file using the same loader. The spec leaves the concrete states tool-specific.
Host-Initiated S1F13/F14 scenario	✅	E30 §6.5	S1F13/F14
Event Notification	✅	E30 §6.6	S6F11/F12	Equipment-initiated, host-acknowledged.
On-Line Identification	✅	E30 §6.7	S1F1/F2	MDLN + SOFTREV.
Error Messages	✅	E30 §6.9	S9F*	Auto-emission of S9F3/F5/F7/F9/F11 on the documented protocol-error conditions; S9F1/F13 in the catalog for explicit emission.
Documentation	✅	E30 §6.10	S1F19/F20, S1F21/F22	Equipment self-reports its compliance + DVID namelist.
Control (Operator-Initiated)	✅	E30 §6.2	—	ControlStateMachine::operator_online/offline/local/remote.

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4. E30 — GEM Additional capabilities (§5.3)

Additional Capability	Status	Spec ref	Messages	Notes
Establish Communications	✅	E30 §6.5	S1F13/F14	Both directions modeled; COMMACK enum.
Dynamic Event Report Configuration	✅	E30 §6.6	S2F33/F34, S2F35/F36, S2F37/F38	Full Define-Report / Link-Event / Enable-Event pipeline with all four ack enums.
Variable Data Collection	✅	E30 §6.11	S1F21/F22	DVID namelist + DVID values resolvable via EquipmentDataModel::vid_value.
Trace Data Collection	✅	E30 §6.12	S2F23/F24, S6F1/F2	TraceStore keeps active TRID→TraceConfig; periodic sampling left to the application's scheduler.
Status Data Collection	✅	E30 §6.13	S1F3/F4, S1F11/F12
Alarm Management	✅	E30 §6.14	S5F1/F2, S5F3/F4, S5F5/F6, S5F7/F8	Full set. ALCD bit-7 set/cleared, lower-7 category.
Remote Control	✅	E30 §6.15	S2F41/F42	Full HCACK 7-value enum + per-parameter CPACKs.
Equipment Constants	✅	E30 §6.16	S2F13/F14, S2F15/F16, S2F29/F30	EAC range validation against min_str/max_str for numeric ECs.
Process Program Management	✅	E30 §6.17	S7F3/F4, S7F5/F6, S7F19/F20	Unformatted PP send/request/list — the minimum E30 GEM requires. (E42 enhanced PP is a separate SEMI standard; see §7.)
Material Movement	⬜	E30 §6.18	—	See §7.
Equipment Terminal Services	✅	E30 §6.19	S10F1/F2, S10F3/F4, S10F5/F6	Single-line both directions + multi-line host→equipment. S10F7 broadcast intentionally omitted (rarely used).
Clock	✅	E30 §6.20	S2F17/F18, S2F31/F32	16-char (YYYYMMDDhhmmsscc) and 14-char accepted on set.
Limits Monitoring	✅	E30 §6.21	S2F45/F46, S2F47/F48	LimitMonitorStore keyed by VID with multiple LimitDefinition (LIMITID + upper/lower as arbitrary Items).
Spooling	✅	E30 §6.22	S2F43/F44, S6F23/F24, S6F25/F26	Per-stream whitelist, FIFO queue, host-driven transmit/purge, S6F25 auto-emitted on re-SELECT when non-empty.
Control	✅	E30 §6.2	—	See Fundamental.

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5. Message coverage matrix

Pair	Direction	Status	Implemented in	Tested
S1F1 / S1F2	H↔E	✅	catalog	✅ round-trip + demo
S1F3 / S1F4	H→E	✅	catalog	✅ round-trip + demo
S1F11 / S1F12	H→E	✅	catalog	✅ round-trip + demo
S1F13 / S1F14	H↔E	✅	catalog	✅ round-trip + demo
S1F15 / S1F16	H→E	✅	catalog	✅ round-trip + demo
S1F17 / S1F18	H→E	✅	catalog	✅ round-trip + demo
S1F19 / S1F20	H→E	✅	catalog	✅ round-trip + demo
S1F21 / S1F22	H→E	✅	catalog	✅ round-trip + demo
S2F13 / S2F14	H→E	✅	catalog	✅ round-trip + demo
S2F15 / S2F16	H→E	✅	catalog	✅ round-trip
S2F17 / S2F18	H→E	✅	catalog	✅ round-trip + demo
S2F23 / S2F24	H→E	✅	catalog	✅ round-trip
S2F29 / S2F30	H→E	✅	catalog	✅ round-trip + demo
S2F31 / S2F32	H→E	✅	catalog	✅ round-trip + demo
S2F33 / S2F34	H→E	✅	catalog	✅ round-trip + demo
S2F35 / S2F36	H→E	✅	catalog	✅ round-trip + demo
S2F37 / S2F38	H→E	✅	catalog	✅ round-trip + demo
S2F41 / S2F42	H→E	✅	catalog	✅ round-trip + demo
S2F43 / S2F44	H→E	✅	catalog	✅ round-trip + demo
S2F45 / S2F46	H→E	✅	catalog	✅ round-trip
S2F47 / S2F48	H→E	✅	catalog	✅ round-trip
S5F1 / S5F2	E→H	✅	catalog	✅ round-trip + demo
S5F3 / S5F4	H→E	✅	catalog	✅ round-trip + demo
S5F5 / S5F6	H→E	✅	catalog	✅ round-trip + demo
S5F7 / S5F8	H→E	✅	catalog	✅ round-trip
S6F1 / S6F2	E→H	✅	catalog	✅ round-trip
S6F11 / S6F12	E→H	✅	catalog	✅ round-trip + demo
S6F23 / S6F24	H→E	✅	catalog	✅ round-trip + demo
S6F25 / S6F26	E→H	✅	catalog + server	✅ round-trip + auto-emitted on re-SELECT
S7F3 / S7F4	H→E	✅	catalog	✅ round-trip
S7F5 / S7F6	H→E	✅	catalog	✅ round-trip + demo
S7F19 / S7F20	H→E	✅	catalog	✅ round-trip + demo
S9F1	E↔H	✅	catalog	✅ round-trip
S9F3	E↔H	✅	catalog + Router wrapper	✅ round-trip + auto-emitted on unknown stream
S9F5	E↔H	✅	catalog + Router wrapper	✅ round-trip + auto-emitted on unknown function
S9F7	E↔H	✅	catalog + Connection	✅ round-trip + auto-emitted on body decode
S9F9	E↔H	✅	catalog + Connection	✅ round-trip + auto-emitted on T3 timeout
S9F11	E↔H	✅	catalog + Connection	✅ round-trip + auto-emitted on oversized frame
S9F13	E↔H	✅	catalog	✅ round-trip
S10F1 / S10F2	H→E	✅	catalog	✅ round-trip + demo
S10F3 / S10F4	E→H	✅	catalog	✅ round-trip + demo
S10F5 / S10F6	H→E	✅	catalog	✅ round-trip

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6. Demo evidence

The two-container demo (docker compose up --no-deps server client) walks ~20 SECS transactions end-to-end:

1. TCP connect → Select.req → Select.rsp(Ok) → SELECTED on both sides.
2. S1F13/S1F14 Establish Comms.
3. S1F17/S1F18 Request Online; control state transitions HostOffline → AttemptOnline → OnlineRemote.
4. S1F19/S1F20 host fetches the equipment's GEM-compliance self-report.
5. S1F21/S1F22 DVID namelist.
6. S1F11/S1F12 SVID namelist → S1F3/S1F4 values read.
7. S2F29/S2F30 EC namelist → S2F13/S2F14 EC read.
8. S2F17/S2F18 clock read.
9. S2F33/S2F34 Define Report 1000 over the 3 SVIDs.
10. S2F35/S2F36 Link CEIDs 200 and 300 to Report 1000.
11. S2F37/S2F38 Enable CEIDs 200, 300.
12. S2F41/S2F42 host command START → server emits S6F11(CEID=300) carrying the linked Report 1000 → host acks S6F12.
13. S5F5/S5F6 list alarm directory.
14. S5F3/S5F4 enable alarm 1.
15. S2F41/S2F42 host command FAULT → server emits S5F1 (ALCD=0x84) + S6F11(CEID=200).
16. Spool window: SPOOL_ON → START (emission goes to spool) → SPOOL_OFF → S6F23(Transmit) → server drains queued S6F11 to host.
17. S7F19/S7F20 recipe list, S7F5/S7F6 fetch RECIPE-A.
18. S10F1/S10F2 host → equipment terminal display.
19. S1F15/S1F16 Request Offline.
20. Separate.req → clean close on both sides.

Unit tests: 84+ cases / 480+ assertions pass (docker compose run --rm tests).

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7. Explicitly out of scope (with reasons)

These look like gaps but are deliberate. None of them blocks the GEM compliance claim.

Item	Why it's out of scope
Material Movement (E30 §6.18)	This is E40 / E87 / E90 (carrier management, substrate tracking, process jobs) — separate SEMI standards layered on top of E30. E30 GEM compliance does not require them. Adding E40 is a Layer-5 deliverable per implementation_plan.md.
Multi-block SECS-I transfers	Multi-block (S6F5/F6, S6F7/F8 etc.) is a SECS-I concept for 244-byte serial frames. HSMS allows arbitrarily large bodies (up to the codebase's 16 MiB cap), so multi-block is structurally not needed. E37-based GEM equipment does not require it.
HSMS-GS (multi-session)	Out of scope — modern HSMS-SS covers virtually all current GEM equipment.
Equipment Processing States (concrete states)	E30 §6.3 says the specific states are tool-defined. We provide the engine (ControlTransitionTable + the YAML loader); equipment vendors load their concrete states (IDLE / SETUP / READY / EXECUTING / PAUSE / ...) the same way data/control_state.yaml is loaded today. Spec-compliant either way.
Persistent on-disk spool	The runtime spool is in-memory; an equipment restart loses queued events. Real fab equipment would back it with a journal. Standard does not mandate persistence.
E42 Enhanced Process Programs (S7F23–F26)	A separate SEMI standard. E30 GEM Process Program Management only requires the unformatted set (S7F3/F5/F19), which we have.
S10F7 Broadcast Terminal Display	Rarely used; equipment vendors typically forgo it. Not required for the Terminal Services capability.
JIS-8 / C2 (Unicode) SECS-II formats	Not used in modern Western fab tooling. Codec is structured so additional formats are trivial to add.

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8. What "100% GEM-compliant" honestly means here

Every GEM Fundamental and every GEM Additional capability that the E30 specification defines with a concrete SECS-II message set is implemented, round-trip-tested, and demonstrated in the two-container demo. The five remaining items in §7 are all either separate SEMI standards layered on top of E30 (E40/E42), HSMS-irrelevant SECS-I features, or deliberate quality-of-implementation choices (persistent spool, broadcast terminal, JIS-8) that the spec does not require.

What this codebase does not demonstrate, and what a real "GEM-compliant" marketing claim would still need:

1. Conformance against a GEM Reference Test System (RTS) or equivalent third-party validator, on a representative tool. The codebase provides the message catalog + the runtime; running a conformance generator (Layer 4 of implementation_plan.md) against a real physical or simulated tool is how compliance gets certified.
2. Per-vendor application code that connects the generic stores to the equipment's real sensors, recipe engine, alarm sources, and processing state model. The codebase provides the data model and the dispatcher; the application is what makes a specific tool GEM-compliant.

In short: this is a GEM-conformant runtime stack, not a GEM-conformant tool. Pointing the runtime at a real piece of equipment, populating the YAML files with the tool's real SVIDs / ECIDs / alarms / capabilities, and wiring the application callbacks completes the picture.