User Guide

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23
GM500-U1G_A
Hardware Development Guide
For 2.85V:
V
OL
max=0.35V
V
OH
min=2.14V
V
IL
max=0.71V
V
IH
min=1.78V
SGMII_MDIO_CLK 85 DO Management data
input output clock
For 1.8V:
V
OL
max=0.45V
V
OH
min=1.4V
For 2.85V:
V
OL
max=0.35V
V
OH
min=2.14V
1.8V/2.85V power domain
If do not need this, leave this pin not
connected.
SGMII_RX_P 103 AI SGMII RX+ Use 0.1 µF AC coupled capacitor, and
place closer to module.
If do not need SGMII, leave this pin not
connected.
SGMII_RX_M 104 AI SGMII RX- Use 0.1 µF AC coupled capacitor, and
place closer to module.
If do not need SGMII, leave this pin not
connected.
SGMII_TX_P 105 AO SGMII TX+ Use 0.1 µF AC coupled capacitor, and
place closer to PHY.
If do not need SGMII, leave this pin not
connected.
SGMII_TX_M 106 AO
SGMII TX－
Use 0.1 µF AC coupled capacitor, and
place closer to PHY.
If do not need SGMII, leave this pin not
connected.
VREF_L5 86 PO SGMIIMDIO signal
pull up power
1.8V/2.85V
Only used for SGMII MDIO pull up
If do not need this, leave this pin not
connected.
I2C Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
I2C_SCL 73 DO I2C serial clock V
OL
max = 0.45V
V
OH
min = 1.35V
Pull-up to 1.8V through external 2.2K
resistance.
If do not need I2C, leave this pin not
connected.
I2C_SDA 74 IO I2C serial data V
OL
max = 0.45V
V
OH
min = 1.35V
V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
Pull-up to 1.8V through external 2.2K
resistance.
If do not need I2C, leave this pin not
connected.