General-Purpose I/O User Guide: Agilex™ 3 FPGAs and SoCs
ID
847266
Date
8/04/2025
Public
1. Agilex™ 3 General-Purpose I/O Overview
2. Agilex™ 3 HSIO Banks
3. Agilex™ 3 HVIO Banks
4. Agilex™ 3 HPS I/O Banks
5. Agilex™ 3 SDM I/O Banks
6. Agilex™ 3 I/O Troubleshooting Guidelines
7. GPIO FPGA IP
8. Programmable I/O Features Description
9. Document Revision History for the General-Purpose I/O User Guide: Agilex™ 3 FPGAs and SoCs
2.5.1. I/O Standard Placement Restrictions for True Differential I/Os
2.5.2. Placement Restrictions for True Differential and Single-Ended I/O Standards in the Same or Adjacent HSIO Bank
2.5.3. VREF Sources and Input Standards Grouping
2.5.4. HSIO Pin Restrictions for External Memory Interfaces
2.5.5. RZQ Pin Requirement
2.5.6. I/O Standards Implementation Based on VCCIO_PIO Voltages
2.5.7. I/O Standard Selection and I/O Bank Supply Compatibility Check
2.5.8. Simultaneous Switching Noise
2.5.9. HPS Shared I/O Requirements
2.5.10. Clocking Requirements
2.5.11. Clock Restrictions for GPIO Interfaces
2.5.12. SDM Shared I/O Requirements
2.5.13. Unused Pins
2.5.14. VCCIO_PIO Supply for Unused HSIO Banks
2.5.15. HSIO Pins During Power Sequencing
2.5.16. Drive Strength Requirement for HSIO Input Pins
2.5.17. Maximum DC Current Restrictions
2.5.18. 1.05 V, 1.1 V, or 1.2 V I/O Interface Voltage Level Compatibility
2.5.19. Connection to True Differential Signaling Input Buffers During Device Reconfiguration
2.5.20. Implementing a Pseudo Open Drain
2.5.21. Allowed Duration for Using RT OCT
2.5.22. Single-Ended Strobe Signal Differential Pin Pair Restriction
2.5.23. Implementing SLVS-400 or DPHY I/O Standard with 1.1 V VCCIO_PIO
2.5.3. VREF Sources and Input Standards Grouping
Consider these VREF sources guidelines.
Agilex™ 3 devices support internal VREF sources. Each I/O lane in the bank also has its own internal VREF generator. You can configure VREF generator in the External Memory Interfaces (EMIF) IP and PHY Lite for Parallel Interfaces IP.
In each I/O lane, adhere to the input standards grouping to ensure all input pins in the I/O lane use the same internal VREF source. If the mix of input standards in an I/O lane does not adhere to these groupings, Quartus® Prime displays error messages during design compilation.
Note: Although the following table lists the groups based on VREF, the final rules depend on implementation. For example, the PHY Lite interface uses one I/O standard per I/O lane. If you use HSTL-12 and SSTL-12 with the PHY Lite for Parallel Interfaces IP, assign each I/O standard in a different I/O lane.
Group | Input Standards Mix within I/O Lane |
---|---|
Group 1 |
|
Group 2 |
|
Group 3 |
|
Group 4 |
|
Group 5 |
|
Related Information