I/O Constraints Definition - UG1091

Kria SOM Carrier Card Design Guide (UG1091)

Document ID: UG1091
Release Date: 2025-09-18
Revision: 1.6 English

Introduction
Electrical Design Considerations
SOM Connector Overview
Supported I/O Standards
Signal Routing Guidelines
MIO Signals
HDIO Signals
HPIO Signals
PS-GTR Transceivers
GTH Transceivers (K26 SOM only)
Transceiver Reference Clocks
I/O Constraints Definition
SOM I/O Timing Model
SOM I/O Drive Strength Definition
SOM Configuration and Control Signals
Sideband Signals
Power Management Signals
SOM MIO Design Considerations
SOM Power
SOM Connector Power Pins
Power Management
Power Sequencing
PS Power Up Behavior
PL Power Up Behavior
SOM Power Off Sequence
PS Power Down
PL Power Down
Power Telemetry
Voltage Rail Monitoring
SOM Power Integrity
SOM Power Estimation
Mechanical Design Considerations
K26 SOM Mechanical Dimensions
K24 SOM Mechanical Dimensions
PCB Fabrication and Assembly House Requirements
K26 SOM to Carrier Card Samtec Connector Placement Guidelines
K24 SOM to Carrier Card Samtec Connector Placement Guidelines
Carrier Card Board to Board Connector Placement Guideline for K26 SOM
Board to Board Connector Distance Tolerance Control for K26 SOM
Board to Board Connector PCB Layout for K26 SOM
Carrier Card Board to Board Connector Placement Guideline for K24 SOM
Board to Board Connector Distance Tolerance Control for K24 SOM
Board to Board Connector PCB Layout for K24 SOM
Board to Board Connector Stencil Design
Footprint Details
Recommended Pb-free Reflow Soldering Profile
Board to Board Assembly Guidelines (K26 SOM)
Carrier Card to K26 SOM Standoff Press-fit Process
Mating: JSOM Standoff-nut Tighten Sequence and Torque Setup
De-mating: JSOM Standoff-nut and Jack Screw Untighten Sequence
K26 SOM System Assembly Example
Board to Board Assembly Guidelines (K24 SOM)
SOM System B2B Connector Assembly Validation-DOE (To Ensure Time 0 No Crack)
Hardware Configuration Using Vivado Tools
Vivado Tools Board Files
Vivado Software SOM Connector Abstraction
SOM Vivado Tools XDC Files
Additional Resources and Legal Notices
Finding Additional Documentation
Support Resources
References
Revision History
Please Read: Important Legal Notices

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