Intel® MAX® 10 General Purpose I/O User Guide

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ID 683751
Date 1/27/2022
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Document Table of Contents
Document Table of Contents x
1. Intel® MAX® 10 I/O Overview 2. Intel® MAX® 10 I/O Architecture and Features 3. Intel® MAX® 10 I/O Design Considerations 4. Intel® MAX® 10 I/O Implementation Guides 5. GPIO Lite Intel® FPGA IP References 6. Intel® MAX® 10 General Purpose I/O User Guide Archives 7. Document Revision History for Intel® MAX® 10 General Purpose I/O User Guide
1. Intel® MAX® 10 I/O Overview x
1.1. Intel® MAX® 10 Devices I/O Resources Per Package 1.2. Intel® MAX® 10 I/O Vertical Migration Support
2. Intel® MAX® 10 I/O Architecture and Features x
2.1. Intel® MAX® 10 I/O Standards Support 2.2. Intel® MAX® 10 I/O Elements 2.3. Intel® MAX® 10 I/O Buffers 2.4. I/O Standards Termination
2.1. Intel® MAX® 10 I/O Standards Support x
2.1.1. Intel® MAX® 10 I/O Standards Voltage and Pin Support
2.2. Intel® MAX® 10 I/O Elements x
2.2.1. Intel® MAX® 10 I/O Banks Architecture 2.2.2. Intel® MAX® 10 I/O Banks Performance 2.2.3. Intel® MAX® 10 I/O Banks Locations
2.3. Intel® MAX® 10 I/O Buffers x
2.3.1. Schmitt-Trigger Input Buffer 2.3.2. Programmable I/O Buffer Features
2.3.2. Programmable I/O Buffer Features x
2.3.2.1. Programmable Open Drain 2.3.2.2. Programmable Bus Hold 2.3.2.3. Programmable Pull-Up Resistor 2.3.2.4. Programmable Current Strength 2.3.2.5. Programmable Output Slew Rate Control 2.3.2.6. Programmable IOE Delay 2.3.2.7. PCI Clamp Diode 2.3.2.8. Programmable Pre-Emphasis 2.3.2.9. Programmable Differential Output Voltage 2.3.2.10. Programmable Emulated Differential Output 2.3.2.11. Programmable Dynamic Power Down
2.4. I/O Standards Termination x
2.4.1. Voltage-Referenced I/O Standards Termination 2.4.2. Differential I/O Standards Termination 2.4.3. Intel® MAX® 10 On-Chip I/O Termination
2.4.3. Intel® MAX® 10 On-Chip I/O Termination x
2.4.3.1. OCT Calibration 2.4.3.2. RS OCT in Intel® MAX® 10 Devices
3. Intel® MAX® 10 I/O Design Considerations x
3.1. Guidelines: VCCIO Range Considerations 3.2. Guidelines: Voltage-Referenced I/O Standards Restriction 3.3. Guidelines: Enable Clamp Diode for LVTTL/LVCMOS Input Buffers 3.4. Guidelines: Adhere to the LVDS I/O Restrictions Rules 3.5. Guidelines: I/O Restriction Rules 3.6. Guidelines: Placement Restrictions for 1.0 V I/O Pin 3.7. Guidelines: Analog-to-Digital Converter I/O Restriction 3.8. Guidelines: External Memory Interface I/O Restrictions 3.9. Guidelines: Dual-Purpose Configuration Pin 3.10. Guidelines: Clock and Data Input Signal for Intel® MAX® 10 E144 Package
3.6. Guidelines: Placement Restrictions for 1.0 V I/O Pin x
3.6.1. Calculating the Total Inductance for 1.0 V Pin Placement
4. Intel® MAX® 10 I/O Implementation Guides x
4.1. GPIO Lite Intel FPGA IP GPIO Lite Intel® FPGA IP 4.2. Verifying Pin Migration Compatibility
4.1. GPIO Lite Intel FPGA IP GPIO Lite Intel® FPGA IP x
4.1.1. GPIO Lite Intel® FPGA IP Data Paths
4.1.1. GPIO Lite Intel® FPGA IP Data Paths x
4.1.1.1. DDR Input Path 4.1.1.2. DDR Output Path with Output Enable
5. GPIO Lite Intel® FPGA IP References x
5.1. GPIO Lite Intel® FPGA IP Parameter Settings 5.2. GPIO Lite Intel® FPGA IP Interface Signals
1. Intel® MAX® 10 I/O Overview
2. Intel® MAX® 10 I/O Architecture and Features
3. Intel® MAX® 10 I/O Design Considerations
4. Intel® MAX® 10 I/O Implementation Guides
5. GPIO Lite Intel® FPGA IP References
6. Intel® MAX® 10 General Purpose I/O User Guide Archives
7. Document Revision History for Intel® MAX® 10 General Purpose I/O User Guide

2.3.2.2. Programmable Bus Hold

Each I/O pin provides an optional bus-hold feature that is active only after configuration. When the device enters user mode, the bus-hold circuit captures the value that is present on the pin by the end of the configuration.

The bus-hold circuitry holds the signal on an I/O pin at its last-driven state until the next input signal is present. Because of this, you do not require an external pull-up or pull-down resistor to hold a signal level when the bus is tri-stated.

User I/O pins can be in either the default weak pull-up state or tri-state during configuration. With the bus-hold feature, if you do not drive the I/O pin externally when it enters user mode from configuration mode:
  • The I/O pin state is weak pull-up during configuration—the I/O pin retains the high value when the device enters user mode.
  • The I/O pin is tri-stated during configuration—the I/O pin value can be high or low when the device enters user mode.

For each I/O pin, you can individually specify that the bus-hold circuitry pulls non-driven pins away from the input threshold voltage—where noise can cause unintended high-frequency switching. To prevent over-driving signals, the bus-hold circuitry drives the voltage level of the I/O pin lower than the VCCIO level.

If you enable the bus-hold feature, you cannot use the programmable pull-up option. To configure the I/O pin for differential signals, disable the bus-hold feature.

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