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RTL8153

INTEGRATED 10/100/1000M ETHERNET CONTROLLER FOR USB APPLICATIONS

Realtek Semiconductor 

RTL8153

Datasheet

6.3.3. Link Down Power Saving Mode

The RTL8153 implements link-down power saving, greatly cutting power consumption when the network

cable is disconnected. The RTL8153 automatically enters link down power saving mode ten seconds after

the cable is disconnected from it. Once it enters link down power saving mode, it transmits normal link

pulses on its TX pins and continues to monitor the RX pins to detect incoming signals. After it detects an

incoming signal, it wakes up from link down power saving mode and operates in normal mode according

to the result of the connection.

6.3.4. Next Page

If 1000Base-T mode is advertised, three additional Next Pages are automatically exchanged between the

two link partners. Users can set PHY Reg4.15 to 1 to manually exchange extra Next Pages via Reg7 and

Reg8 as defined in IEEE 802.3ab.

6.4. EEPROM Interface

Both SPI and TWSI EEPROM interfaces are supported. The SPI interface utilizes a

93C46/93C56/93C66, which is 1K-bit/2K-bit/4K-bit, respectively, EEPROM. The EEPROM interface

permits the RTL8153 to read from, and write data to, an external serial EEPROM device.

Values in the internal eFUSE memory or external EEPROM allow default register values to be overridden

following a power-on or software EEPROM auto-load command. The RTL8153 will auto-load values

from the eFUSE or EEPROM. If the EEPROM is not present and eFUSE auto-load is bypassed, the

RTL8153 initialization uses default values for the appropriate Configuration and Operational Registers.

Software can read and write to the EEPROM using bit-bang accesses via the 9346CR Register. The

EEPROM SPI interface consists of EESK, EECS, EEDO, and EEDI. The TWSI interface shares

SCL/SDA with EECS/EEDI.

The correct EEPROM (i.e., 93C46/93C56/93C66) must be used in order to ensure proper LAN function.

EEPROM

EECS/SCL

EESK

EEDI/SDA

EEDO

Table 17. EEPROM Interface

Description

EECS: EEPROM (93C46/93C56/93C66) chip select

SCL: Serial data clock for TWSI EEPROM

Serial Data Clock for EEPROM (93C46/93C56/93C66).

EEDI: Output to serial data input pin of EEPROM (93C46/93C56/93C66)

SDA: Data interface for TWSI EEPROM

Input from Serial Data Output Pin of EEPROM (93C46/93C56/93C66).

Integrated 10/100/1000M Ethernet Controller for USB Applications

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Track ID: JATR-8275-15 Rev. 1.1

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