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
2.4.1.1.2. RT OCT
The Agilex™ 3 devices support RT OCT with and without calibration. RT OCT is available only for input and bidirectional pins. Output pins do not support RT OCT.
You must disable RT OCT for interfaces that require external termination circuitry near the receiver of the Agilex™ 3 device.
OCT Scheme | Description |
---|---|
RT OCT without calibration |
|
RT OCT with calibration |
|
Figure 10. RT OCT with Calibration
I/O Standard | RT OCT without Calibration8 (Ω) | RT OCT with Calibration (Ω) |
---|---|---|
1.3 V LVCMOS | — | — |
1.2 V LVCMOS | — | — |
1.1 V LVCMOS | — | — |
1.05 V LVCMOS | — | — |
1.0 V LVCMOS | — | — |
SSTL-12 | 50 | 50, 60 |
HSTL-12 | 50 | 50, 60 |
HSUL-12 | — | — |
POD12 | 50 | 40, 50, 60 |
POD11 | 50 | 40, 50, 60 |
LVSTL11 | 50 | 40, 50, 60 |
LVSTL105 | 50 | 40, 50, 60 |
Differential SSTL-12 | 50 | 50, 60 |
Differential HSTL-12 | 50 | 50, 60 |
Differential HSUL-12 | — | — |
Differential POD12 | 50 | 40, 50, 60 |
Differential POD11 | 50 | 40, 50, 60 |
Differential LVSTL11 | 50 | 40, 50, 60 |
Differential LVSTL105 | 50 | 40, 50, 60 |
Related Information
8 Supported only in GPIO mode.