PCB Layout Guidance

flux

0:00

Work completed
  • Added project property Upstream_Keepout_Boundaries: “0.5 mm keepout margin around x16 upstream PCIe lane routing area”
  • Added project property Downstream_Keepout_Boundaries: “0.5 mm keepout margin around x8 downstream fan-out routing area”
Tasks not executed
  • Fetching actual keepout boundary coordinates from the PCB layout tool
  • Placing GND stitching vias at 5 mm pitch along both keepout boundaries
  • Assigning PCIe lane nets to the PCIE_Lanes_NetClass
  • Assigning SRNS_REFCLK nets to the SRNS_REFCLK_NetClass
  • Running Auto-Layout routing for PCIe lanes and SRNS_REFCLK nets
  • Performing ERC/DRC checks and summarizing compliance
Success criteria review
  • Upstream and downstream keepout boundaries recorded as properties: ✅
  • GND stitching vias placed at 5 mm pitch: ❌
  • PCIe and SRNS_REFCLK nets auto-routed under the correct net classes: ❌
  • ERC/DRC report confirming compliance: ❌
Recommended next step
Place the GND stitching vias along the defined keepout boundaries using the PCB layout tool, then verify they’re tied to GND and respect spacing rules before proceeding with net-class assignments and auto-routing.
179 days
Sign up to send
C11
Capacitance
Capacitance
C14
Capacitance
Capacitance
C4
Capacitance
Capacitance
C1
Capacitance
Capacitance
C6
Capacitance
Capacitance
C3
Capacitance
Capacitance
C2
Capacitance
Capacitance
C7
Capacitance
Capacitance
C12
Capacitance
Capacitance
C9
Capacitance
Capacitance
C13
Capacitance
Capacitance
C5
Capacitance
Capacitance
C10
Capacitance
Capacitance
C8
Capacitance
Capacitance
J1 23 - U1 C3+
J1 12 - U1 B1-
J1 16 - U1 B3-
J1 18 - U1 C0-
C2 P1 - C10 P1
J1 17 - U1 C0+
J1 22 - U1 C2-
J1 20 - U1 C1-
C1 P1 - C9 P1
J1 21 - U1 C2+
C1 P1 - C9 P1
J1 13 - U1 B2+
J1 19 - U1 C1+
J1 15 - U1 B3+
C2 P1 - C10 P1
J1 11 - U1 B1+
J1 10 - U1 B0-
J1 14 - U1 B2-
J1 24 - U1 C3-
J1 9 - U1 B0+
Hole3
Hole2
Hole1
Hole4
U2
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    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
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    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
    jharwinbarrozo
    1.5M
  • Generic Inductor
    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
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

#4 AI Context Consensus Processor (ACCP)

#4 AI Context Consensus Processor (ACCP) thumbnail
PCIe Gen4 x16 Subsystem for ACCP 2U Blade: Integrated Switch, Lane Bifurcation, and SRNS Refclk with 85Ω Impedance Routing

Properties

Standard 10 Layer

No ERC or DRC issues detected

5 mm along the defined keepout boundaries

482.6

mm

PCIe 4.0

2025-10-29T00:00:00Z

Standard 4 Layer

20

ps

High Speed

Inner Layers 2 and 3

Upstream domain: 0.5 mm keepout margin around PCIe Gen4 x16 lane routing regions; Downstream domains: 0.5 mm keepout margin around x8 fanout regions; Stitching vias every 5 mm along differential pair return‐path boundaries.

0.5 mm keepout margin around x16 upstream PCIe lane routing area

85

Ω

0.5 mm keepout margin around x8 downstream fan-out routing area

88.9

mm

Top and Bottom

differential pair ~85 Ω, skew ≤2 ps, length matching ±50 mil, dedicated routing.

6

mil

target impedance: 85Ω; min spacing: 6 mil; max PN skew: 5 ps; max pair-to-pair skew: 20 ps; max vias per lane: 2

0.5 mm keepout around x8 downstream fan-out routing area

0.5 mm keepout around x16 upstream PCIe lane routing area

5

ps

``` mermaid graph TD CE["PCIe x16 Card-edge Connector"] -->|"16x PCIe Gen4 Lanes + SRNS REFCLK + Sideband + Power (12V, 3.3V_AUX)"| SW["PCIe Gen4 Switch (x16 Upstream)"] SW -->|"x8 PCIe Gen4 Lanes + Sidebands + Power"| EP1["Downstream x8 Endpoint Connector #1"] SW -->|"x8 PCIe Gen4 Lanes + Sidebands + Power"| EP2["Downstream x8 Endpoint Connector #2"] CE -.->|"Sideband: PERST#, CLKREQ#, WAKE#, SMBus/PD, Presence Detect"| SW CE -.->|"Power: 12V, 3.3V_AUX"| SW ```

enabled

2

target impedance: 85Ω; skew ≤ 2 ps; length matching ±50 mil; dedicated differential routing; max vias: 2

Pricing & Availability

Distributor

Qty 1

Controls