9.12.9 PolarFire SOC MSS I/O Attributes

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 will be 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 Clamp Diode OFF, ON
MSS Persist OFF, ON
MSS User I/O Lock Down OFF, ON
MSS Odt (Ohm) OFF, 100
MSS Thevenin (Ohm) OFF, 150, 75, 50
MSS Schmitt Trigger OFF, ON

Peripheral I/Os

The following table lists the MSS I/O attributes in the I/O Editor for Peripheral I/Os.
Table 9-14. MSS I/O Attributes and Values for Peripheral I/Os
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) 1.5, 2, 3, 3.5, 4, 6, 8, 10, 12, 16, 20, 24, 27, 30, 34, 40, 48, 60

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
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. Outdrive for DQ and DM Ports, DQS Ports, CLK Ports, ADD/CMD Ports
Memory Type Value (mA)
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, Hold
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