Agilex™ 7 Device Family High-Speed Serial Interface Signal Integrity Design Guidelines

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ID 683864
Date 11/20/2024
Public
Document Table of Contents
Document Table of Contents x
1. Signal Integrity (SI) in High-Speed PCB Designs
1. Signal Integrity (SI) in High-Speed PCB Designs x
1.1. Supported Protocols 1.2. Channel Insertion Loss (IL) Budget Calculation 1.3. PCB Materials and Stackup Design Guidelines 1.4. PCB Design Guidelines 1.5. Document Revision History for the Agilex™ 7 Device Family High-Speed Serial Interface Signal Integrity Design Guidelines
1.3. PCB Materials and Stackup Design Guidelines x
1.3.1. Mitigating Insertion Loss with Dielectric Material 1.3.2. Power Layers 1.3.3. Reference Planes 1.3.4. Layer Assignment 1.3.5. Impedance 1.3.6. Via Drill Size 1.3.7. Fiber Weave 1.3.8. Reference Stackup
1.4. PCB Design Guidelines x
1.4.1. General PCB Design Guidelines 1.4.2. E-Tile PCB Design Guidelines 1.4.3. F-Tile PCB Design Guidelines 1.4.4. P-Tile PCB Design Guidelines 1.4.5. R-Tile PCB Guidelines
1.4.1. General PCB Design Guidelines x
1.4.1.1. PCB Traces 1.4.1.2. PCB Vias 1.4.1.3. Connector Breakout 1.4.1.4. AC Coupling Capacitor 1.4.1.5. Others
1.4.3. F-Tile PCB Design Guidelines x
1.4.3.1. F-Tile Features and Capabilities 1.4.3.2. Optimizing the Passive Channel 1.4.3.3. COM Simulations 1.4.3.4. Simulating the Active Channel
1.4.5. R-Tile PCB Guidelines x
1.4.5.1. R-Tiles Features and Capabilities 1.4.5.2. R-Tile Design Layout Examples 1.4.5.3. Landing Pad Cut-out Optimization of AC Coupling Capacitor 1.4.5.4. R-tile HSSI Breakout Routing in BGA Area and MCIO connector Pin Area 1.4.5.5. AC Coupling Capacitor Placement Around MCIO Connector 1.4.5.6. PCIe Gen5 Add-in Card Edge Finger Breakout Design Guidelines
1. Signal Integrity (SI) in High-Speed PCB Designs

1.4.5.1. R-Tiles Features and Capabilities

R-tile devices support 16 channels of SERDES hard IP, running up to 32Gbps NRZ. The PHY supports the channels according to the specification definition of each protocol. R-tile devices support a maximum end-to-end channel loss of 36dB at 16 GHz with BER of 1E-12 for NRZ signaling. This 36dB includes package and silicon losses. For add-in card applications, the maximum insertion loss is 9.5dB at 16 GHz on add-in cards which includes the package and silicon loss. This loss is from the top of the edge finger to the silicon die pad based on the PCIe CEM5.0 spec. This 9.5dB includes PCB traces, vias, AC caps, and package including the effective die capacitance. Altera recommends running the end-to-end channel passive characteristics simulation, e.g. insertion loss (IL), return loss (RL), and crosstalk simulation, especially if the channel IL is high.

The channel passive characteristics simulation allows for quick risk evaluation at the initial stage of the board and system design. Finally, perform the complete post layout channel timing closure simulation and measurements while considering all impairments, e.g. the crosstalk and manufacturing tolerance.

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