Controller Board Layout Visualisations

Status: Draft Project: Enigma-NG Author: Izzyonstage & GitHub Copilot Version: v1.0.0 Associated Hardware Revision: Rev A Last Updated: 2026-04-20

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1. Rear Dock Interfaces

The Controller is the fixed motherboard of the enclosure and carries both removable-board docks:

• J1 / J2 / J3 — three TE 10-position connectors to the Power Module
• J4 / J5 — two Molex EXTreme Guardian HD hybrid connectors to the Stator

rear edge of Controller

 [ J4 ] [ J5 ]   [ J1 ] [ J2 ] [ J3 ]
  to Stator          to Power Module

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2. Controller ↔ Power Module Dock

J1 — Main Regulated Rails

Allocation	Notes
3 × 5V_MAIN	Primary regulated 5V feed from PM to Controller
2 × 3V3_ENIG	Clean logic rail feed from PM to Controller
5 × GND	Shared return path

Connector family: TE 1-1674231-1 (Controller receptacle) ↔ 1123684-7 (PM plug), 10 positions, 2.5 mm pitch, 6 A/contact.

Reference PDFs: TE-1-1674231-1-datasheet.pdf, TE-1123684-7-datasheet.pdf

J2 — PoE Auxiliary Feed

Allocation	Notes
3 × VIN_POE_12V	Regulated PoE-derived 12V-class auxiliary feed from Controller PoE front-end into PM OR-ing stage
7 × GND	Shared return path

J3 — Low-Speed Control / Telemetry

Signal	Direction	Notes
I2C1_SDA	Bidir	Shared PM telemetry and PM-local GPIO-expander bus
I2C1_SCL	Bidir	Shared PM telemetry and PM-local GPIO-expander bus
PM_IO_INT_N	PM -> CTRL	Active-low interrupt from PM PCA9534APWR
PWR_GD	PM -> CTRL	Direct rail-health telemetry from MCP121T
ROTOR_EN	CTRL -> PM	Direct 3V3_ENIG LDO enable control
PWR_BUT	PM -> CTRL	Direct CM5 PMIC power-button path
LED_nPWR	CTRL -> PM	Direct CM5 power-state indication for the SW2 hardware LED logic
3 × GND	—	Guards / return path

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3. Controller ↔ Stator Dock

J4 — 5V_MAIN-Biased Hybrid Dock

Contact group	Allocation
Power blades	4 × 5V_MAIN, 1 × GND
Signal field	additional GND guards / returns

J5 — 3V3_ENIG + JTAG / I2C Hybrid Dock

Contact group	Allocation
Power blades	4 × 3V3_ENIG, 1 × GND
Signal field	guarded TCK, TMS, TDI, TTD_RETURN, I2C1_SDA, I2C1_SCL, remaining signal contacts = GND

Connector family: Molex 2195630015 receptacle on Controller ↔ 2195620015 plug on Stator.

Reference PDFs: Molex-2195630015-datasheet.pdf, Molex-2195630015-drawings.pdf, Molex-2195620015-datasheet.pdf, Molex-2195620015-drawings.pdf, Molex-ExtremeGuardianHD-2141130000-PS-000-specification.pdf

The J5 logic connector deliberately groups the JTAG cluster and TTD_RETURN with the 3V3_ENIG feed. The J4 connector is reserved for 5V delivery and return-current support.

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4. External I/O Placement

top / right edge of Controller

 [ RJ45 + PoE front-end ]
 [ USB 3.0 stacked Type-A ]
 [ HDMI ]

• The Controller owns the RJ45, Ethernet ESD, magnetics, and PoE PD / ACF front-end. The PoE front-end passes its regulated auxiliary feed into the Power Module over J2.
• J_DSI1 and J_FAN are internal-only connectors and are not part of the external I/O edge. J_DSI1 routes to the future in-lid touchscreen expansion, while J_FAN serves the CM5 active-cooler heatsink fan.

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5. Diagnostic Banks

Diagnostic Bank-Alpha — Power Module Dock (2×8)

Pin	Signal	Description
1	5V_MAIN_A	J1 regulated 5V feed sample
2	5V_MAIN_B	J1 regulated 5V feed sample
3	3V3_ENIG_A	J1 logic-rail sample
4	3V3_ENIG_B	J1 logic-rail sample
5	VIN_POE_12V	J2 PoE auxiliary feed sample
6	I2C1_SDA	PM telemetry bus
7	I2C1_SCL	PM telemetry bus
8	PM_IO_INT_N	PM expander interrupt
9	PWR_GD	Direct PM rail-health signal
10	ROTOR_EN	Direct PM LDO enable
11	PWR_BUT	CM5 PMIC power-button path
12	LED_nPWR	Direct CM5 power-state indication to the PM
13	GND	Signal ground
14	GND	Signal ground
15	GND	System ground
16	GND_CHASSIS	Controller local shield/chassis reference only

Diagnostic Bank-Beta — Stator Dock (2×8)

Pin	Signal	Description
1	5V_MAIN_J4_1	J4 5V blade sample
2	5V_MAIN_J4_2	J4 5V blade sample
3	3V3_ENIG_J5_1	J5 3V3 blade sample
4	3V3_ENIG_J5_2	J5 3V3 blade sample
5	I2C1_SDA	Shared Stator / Settings bus
6	I2C1_SCL	Shared Stator / Settings bus
7	TCK	JTAG clock
8	TMS	JTAG mode
9	TDI	JTAG data in
10	TTD_RETURN	JTAG return from Reflector chain
11	GND	Logic guard
12	GND	Logic guard
13	GND	Power return
14	GND	Power return
15	GND	System ground
16	GND_CHASSIS	Local shield/chassis reference only

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6. Placement Summary

         rear docks                    controller core                  user I/O
 __________________________________________________________________________________________
|   [J4][J5] [J1][J2][J3]    | [ CM5 sockets + JDB headers ]  | [RJ45] [USB3] [HDMI] [DSI] |
|____________________________|________________________________|____________________________|

The Controller remains the only board that must be inserted as the enclosure reference part. The Power Module and Stator then dock into it as mechanically independent service modules.