1 What's New
Information about what is new in Libero SoC Design Suite
2 Download Help
Information to help you download the Libero SoC Design Suite documentation
3 SmartHLS Compiler
Information about SmartHLS Compiler
4 Installation and Licensing
Information about Libero SoC software installation and licensing
5 Design Flow
Information about Design Flow
6 Block Flow
Information about Block Flow
7 SmartDesign
Information about SmartDesign
8 Netlist Viewer
Information about Netlist Viewer
9 I/O Editor
Information about I/O Editor
- 9 Introduction
- 9.1 Invoking the I/O Editor
- 9.2 Port View
- 9.3 Pin View
- 9.4 Package View
- 9.5 Interface—Specific I/Os and Views
- 9.6 Memory Interface View
- 9.7 XCVR View
- 9.8 IOD View
- 9.9 Floorplanner View
- 9.10 Other I/O Editor Windows
- 9.11 Export Physical Constraints (PDC)
- 9.12 Appendix
  - 9.12.1 MSS I/O Placement
  - 9.12.2 Bank Settings
  - 9.12.3 IOSTD Support per Type of Bank
  - 9.12.4 Port IOSTD Settings
  - 9.12.5 Updating the I/O Banks and IOSTD
  - 9.12.6 Designs without an MSS Macro
  - 9.12.7 Default Bank Settings
    If there is an MSS macro in the design and some interfaces are not used, this is the default bank settings that will be used.
  - 9.12.8 PDC Setting
  - 9.12.9 PolarFire SoC MSS I/O Attributes
10 PDC Commands
Information about PDC commands for all families
11 Chip Planner
Information about Chip Planner
12 Timing Constraints Editor
Information about Timing Constraints Editor
13 SmartTime Static Timing Analyzer
Information about SmartTime Static Timing Analyzer
14 SmartPower
Information about SmartPower
15 Programming and Debugging
Information about Programming and Debugging
16 Macro Library
Information about Macro Library for SmartFusion2, IGLOO2 and PolarFire
17 Custom Flow
Information about Custom Flow
18 Design Separation Methodology
Information about Design Separation Methodology
19 Microchip Separation Verification Tool
Information about Microchip Separation Verification Tool
20 PolarFire SoC Microcontroller Subsystem (MSS)
Information about PolarFire SoC Microcontroller Subsystem (MSS)
21 Tcl Command Reference
Information about Tcl Command Reference
22 Additional Information
Additional information about other Microchip products
23 Technical Support
24 About Microchip
More information about Microchip

9.12.9 PolarFire SoC MSS I/O Attributes

(Ask a Question)

These I/O attributes are valid only for MSS I/Os and are read only in the I/O Editor. These MSS I/O attributes appear on the right side of the default I/O attributes and are visible even when there is no MSS being used in the design.

Reference Clock

The following table lists the MSS I/O attributes in the I/O Editor for Reference CLK.

Table 9-13. MSS I/O Attributes and Values for Reference CLK
MSS I/O Attributes	Values
MSS Resistor Pull	None, Up
MSS User I/O Lock Down	OFF
MSS Odt (Ohm)	OFF, 100
MSS Thevenin (Ohm)	OFF, 150, 75, 50
MSS Schmitt Trigger	OFF, ON

Peripheral and GPIO I/Os

The following table lists the MSS I/O attributes in the I/O Editor for Peripheral I/Os and GPIOs.

Table 9-14. MSS I/O Attributes and Values for Peripheral I/Os and GPIOs
MSS I/O Attributes	Values
MSS Resistor Pull	None, Up, Down, Hold
MSS Clamp Diode	OFF, ON
MSS Persist	OFF, ON
MSS User I/O Lock Down	OFF, ON
MSS Schmitt Trigger	Schmitt Trigger is always ON for 1.2, 1.5 and 1.8 V I/O Bank values. Otherwise, it can be either ON or OFF. The MSS Schmitt Trigger can have the following values: OFF, ON
MSS Low Power Mode Input Receiver	OFF, ON
MSS Low Power Mode Output Buffer	OFF, ON
MSS Output Drive (mA)	2, 4, 6, 8, 10, 12, 16, 20

DDR I/Os

The following table lists the MSS I/O attributes in the I/O Editor for DDR I/Os.

Based on the memory type used, the memory types have the following values.

Table 9-15. ODT DQ and ODT DQS Ports
Memory Type	Value (Ohm)
DDR3/DDR3L	120, 60, 40, 30
DDR4	120, 80, 60, 40, 30
LPDDR3	240, 120, 80, 60, 40, 30
LPDDR4	120, 80, 60, 48, 40

Table 9-16. Impedance for DQ and DM Ports, DQS Ports, CLK Ports, ADD/CMD Ports
Memory Type	Value (Ohm)
DDR3/DDR3L	48, 34, 30, 24
DDR4	60, 48, 34, 27
LPDDR3	60, 48, 40, 34
LPDDR4	60, 48, 40, 34

SGMII I/Os

The following table lists the MSS I/O attributes in the I/O Editor for SGMII.

Table 9-17. MSS I/O Attributes and Values for SGMII
MSS I/O Attributes	Values
MSS Resistor Pull	None, Up, Down
MSS Odt (Ohm)	OFF, 100
MSS Vcm Input Range	MID, LOW
MSS Source Termination (Ohm)	OFF, 100
MSS Output Drive (mA)	1.5, 2, 3, 3.5, 4, 6

Rev: 2026.1