Auto-Link-SPE-G User Manual
Rev. 1.6
2020-07-05
9 / 10
Register Access
The Register Table allows to read and write PHY registers directly. Modifying the register settings
can impact the Media Converter functionality. All changes are transient and are lost after resetting or
power cycling the device. Please use this function only if you do have the required knowledge. The
software prevents write access to registers which can impact the hardware configuration. For a
documentation of the PHY registers contact the PHY vendor.
The Register Table is laid out for Clause 45 MDIO access.
Device
Specifies the Clause 45 device address. The values are preconfigured and be
selected by right-clicking a respective field.
Register
Is the PYH Register address according to Clause 45. Entering a value and pressing
ENTER or TAB will read the respective register.
Value
Represents a PHY register value that has been read entering the address data in the
Device and Register fields. Entering a value in this field will result in a write operation
to the respective register. Written values are read back and displayed for a validation
of the write operation.
All entries are expected to be hexadecimal numbers.
7.3
T(X) Functions
The “legacy” Ethernet PHY supports Link State Monitoring and Register Access like the T1 PHY.
Please refer to the previous section for a description.
The used BCM54811 PHY does not support Clause 45 MDIO addressing. The Device address is
used here to ease access to registers that need a specific access procedure.
00
1000BASE-T/100BASE-TX/10BASE-T Registers and
Auxiliary Registers
18
Shadow 18 Registers: Enter the Shadow Selector in the Register field.
1C
Shadow 1C Registers: Enter the Shadow Selector in the Register field.
07
Clause 45 Registers
0D
Top Level Expansion Registers
0F
Expansion Registers
