Flux.ai Neuromorphic Node Setup

Thought for 53 sec

flux

F40 Crossbar Emulator — Project Doc Blurb

Purpose

Implements a 4×8 analog crossbar emulator for vector-matrix multiply (VMM): column currents reflect weighted sums of four row inputs per column.
This is the “excitatory” bank (8 columns); an inhibitory bank can be added later.

Architecture

4 rows × 8 columns of synapses (32 total). Each synapse multiplies a shared row input by an individual weight voltage.
Eight quad DAC channels (one quad per column) generate the weight voltages.
Two quad op-amps implement eight inverting column summers (one per column, 4 inputs each).
A bus transceiver level-shifts MCU row spikes to the 5 V row domain.

Key interfaces

Rows (inputs): ROW0, ROW1, ROW2, ROW3 (post-level-shift, nominal 5 V).
Column outputs (to next stage): V_COL_SUM[0..7].
I2C bus: SDA, SCL (3.3 V logic), pulled up by 4.7 kΩ.
Header: CROSSBAR_I2C 2×5 (pins: 3V3, GND, SDA, SCL, LS_DIR, LS_OE_N, ROW0_MCU, ROW1_MCU, ROW2_MCU, ROW3_MCU).
Test points: TP_ROW0..3, TP_COL0..7, TP_WEIGHT_SAMPLE.

Power rails

Analog: +5 V (V5A), −5 V (VN5A).
Digital: +3.3 V (V3D).
Grounding: AGND_SUM is a local bias net for the column summers and is tied to GND at a single 0 Ω link (net-tie). Do not pour AGND_SUM planes.

Design details

Column summers: inverting configuration; 4× input resistors per column and 1× feedback resistor (nominal 10 kΩ each for unity-weighted sum).
Non-inverting pin biasing: each summer IN+ references ground only through a resistor to AGND_SUM (no direct IN+ to GND ties).
Per‑IC decoupling: 100 nF at each IC supply; place close to pins.
DAC bulk caps: 10 µF per DAC on VDD, plus local 100 nF.

I2C addressing

Excitatory bank: 0x60–0x67 (one quad per column).
Reserve 0x68–0x6F for an optional inhibitory bank.

PCB constraints

Board size: 100 mm × 80 mm.
Keep analog paths short; place decouplers within 5 mm of pins.
Do not pour AGND_SUM; maintain a single-point tie to GND.

Verification checklist

ERC/DRC clean; no shorted components.
IN+ pins of all summers biased via resistor to AGND_SUM only.
I2C pull-ups present; SDA/SCL at 3.3 V.
All row lines driven through the level shifter; DIR and OE set correctly.
All ICs have 100 nF decouplers; all DACs have 10 µF bulk.
Test points placed and named as listed.

olegg

Thought for 48 sec

flux

I can update the project description with your F40 Crossbar Emulator documentation blurb. I’ll apply the change now.

Once it’s in, re-run the review to confirm the “Project has no documentation” item clears. If you want the same text also saved as a project property (e.g., Docs:F40), let me know and I can add that too.

R26

Resistance

10kohms

R23 P2 - U_SYN_R0_C5 W

R24 P2 - U_SYN_R1_C5 W

R25 P2 - U_SYN_R2_C5 W

R23

Resistance

10kohms

R23 P1 - R24 P1

R24

Resistance

10kohms

R26 P2 - U_SYN_R3_C5 W

R25

Resistance

10kohms

Reviews

Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
16.2k
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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1.5M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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1.5M
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20.5M
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43.0M
RMCF0805JT47K0
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1.2M
CTL1206FYW1T
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1.1M
1070TR
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700.5k

Project Name

Rich Salmon Memory Implanter f5ea

Description

Welcome to your new project. Imagine what you can build here.

Properties

System Architecture

Diagram

Pricing & Availability

Distributor	Qty 1
Arrow	$424.90–$584.80
Digi-Key	$459.52–$460.88
LCSC	$975.38
Mouser	$657.92
TME	$0.61
Verical	$368.67–$952.28

Controls

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kanjutech / Rich Salmon Memory Implanter f5ea

Schematic