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

ID 683751
Date 1/27/2022
Public

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2.3.2. Programmable I/O Buffer Features

The Intel® MAX® 10 I/O buffers support a range of programmable features. These features increase the flexibility of I/O utilization and provide an alternative to reduce the usage of external discrete components such as a pull-up resistor and a diode.
Table 6.  Summary of Supported Intel® MAX® 10 Programmable I/O Buffer Features and Settings
Feature

Setting

Condition Assignment Name Supported I/O Standards
Open Drain On, Off (default) To enable this feature, use the OPNDRN primitive.
  • 3.0 V and 3.3 V LVTTL
  • 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, and 3.3 V LVCMOS
  • SSTL-2, SSTL-18, SSTL-15, and SSTL-135
  • 1.2 V, 1.5 V, and 1.8 V HSTL
  • HSUL-12
  • 3.0 V PCI
Bus-Hold On, Off (default) Disabled if you use the weak pull-up resistor feature. Enable Bus-Hold Circuitry
  • 3.0 V and 3.3 V LVTTL
  • 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, and 3.3 V LVCMOS
  • SSTL-2, SSTL-18, SSTL-15, and SSTL-135
  • 1.2 V, 1.5 V, and 1.8 V HSTL
  • HSUL-12
  • 3.0 V PCI
Pull-up Resistor On, Off (default) Disabled if you use the bus-hold feature. Weak Pull-Up Resistor
Slew Rate Control 0 (Slow), 1 (Medium), 2 (Fast). Default is 2. Disabled if you use OCT. Slew Rate
  • 3.0 V LVTTL
  • 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.0 V LVCMOS
  • SSTL-2, SSTL-18, and SSTL-15
  • 1.2 V, 1.5 V, and 1.8 V HSTL
  • Differential SSTL-2, Differential SSTL-18, and Differential SSTL-15
  • Differential 1.2 V, 1.5 V, and 1.8 V HSTL
PCI Clamp Diode On (default for input pins),

Off (default for output pins, except 3.0 V PCI)

PCI I/O
  • 3.0 V and 3.3 V LVTTL
  • 2.5 V, 3.0 V, and 3.3 V LVCMOS
  • 3.0 V PCI
  • 2.5 V, 3.0 V, and 3.3 V Schmitt Trigger
Pre-Emphasis 0 (disabled), 1 (enabled). Default is 1. Programmable Pre-emphasis
  • LVDS
  • RSDS
  • PPDS
  • Mini-LVDS
Differential Output Voltage 0 (low), 1 (medium), 2 (high). Default is 2. Programmable Differential Output Voltage (VOD)