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RTL8101E-GR Datasheet(PDF) 17 Page - Realtek Semiconductor Corp.

Part # RTL8101E-GR
Description  INTEGRATED FAST ETHERNET CONTROLLER FOR PCI EXPRESS??APPLICATIONS
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Manufacturer  REALTEK [Realtek Semiconductor Corp.]
Direct Link  https://www.realtek.com/en/
Logo REALTEK - Realtek Semiconductor Corp.

RTL8101E-GR Datasheet(HTML) 17 Page - Realtek Semiconductor Corp.

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RTL8101E-GR
Datasheet
Integrated Fast Ethernet Controller for PCI Express
12
Track ID: JATR-1076-21
Rev. 1.1
6.4. EEPROM Interface
The RTL8101E requires the attachment of an external EEPROM. The 93C46/93C56 is a 1K-bit/2K-bit
EEPROM. The EEPROM interface permits the RTL8101E to read from, and write data to, an external
serial EEPROM device.
Values in the external EEPROM allow default fields in PCI configuration space and I/O space to be
overridden following a power-on or software EEPROM auto-load command. The RTL8101E will
auto-load values from the EEPROM. If the EEPROM is not present, the RTL8101E 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, or using PCI VPD (Vital Product Data).
The interface consists of EESK, EECS, EEDO, and EEDI.
The correct EEPROM (i.e. 93C46/93C56) must be used in order to ensure proper LAN function.
Table 10. EEPROM Interface
EEPROM
Description
EECS
93C46/93C56 chip select.
EESK
EEPROM serial data clock.
EEDI/Aux
Input data bus/Input pin to detect whether Aux. Power exists on initial power-on.
This pin should be connected to EEPROM. To support wakeup from ACPI D3cold or
APM power-down, this pin must be pulled high to Aux. Power via a resistor. If this pin is
not pulled high to Aux. Power, the RTL8101E assumes that no Aux. Power exists.
EEDO
Output data bus.


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