Intel EP80579 Guide

Intel
®
EP80579 Integrated Processor Product Line—Gigabit Ethernet (GbE) Interface
Intel
®
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
215 Order Number: 320068-005US
19.5 GbE Interface - LAN Connect Interface Guidelines
The following sections contain guidelines on implementing a platform LAN connect
device on a system motherboard. These sections should treated as a guideline and not
as a specification and the system designer must ensure through simulations or other
techniques that the system meets the specified timings.
19.5.1 GbE Ethernet Interface — RGMII Mode
This section describes the GbE Ethernet reference clock transmit and receive timings
when operating in RGMII mode. RGMII works in source synchronous mode, where
transmit and receive data are synchronized with respect to TxCLK and RxCLK. In RGMII
mode, TxCLK and RxCLK run at 2.5/25/125 MHz. In 2.5/25 MHz mode, both
transmission and receive occurs on rising edges of the clock. At 125 MHz, data transfer
(both Tx and Rx) occurs on both edges of the clock.
Table 81. GbE MAC Management Data Interface Signals
Name
Input/
Output
Pull
Up/
Down
Recommendations
MDIO IO Yes
• Management Data Input/Output.
• Pull-up signal to EP80579 GbE 2.5V Standby (VCCSUS25) using a 1.5 KΩ
± 5% resistor.
Note:
• Must be pulled high through a 10 KΩ resistor to EP80579 GbE 2.5V
Standby (VCCSUS25) the interface is not used.
MDC O No
• Management Data Clock.
• Provide termination if signal is connected to multiple receivers
• Resides in GbE Standby Power Well
Note:
• Can be left as no connect if the interface is not used.
Table 82. GbE MAC Serial EEPROM Interface Signals
Name
Input/
Output
Pull
Up/
Down
Recommendations
EEDO I Yes
• EEPROM Output Data. Data from EEPROM to EP80579
•An external pull-up resistor of 4.7 KΩ is required.
• Resides in GbE Standby Power Well.
EEDI O Yes
• EEPROM Input Data. Data from EP80579 to EEPROM
• Requires a 20KΩ pull-up resistor to GbE Standby Power, if GbE
Standby power is generated on the platform; otherwise pull-down
with 4.7 KΩ
EECS O Yes
• EEPROM Chip Select. Used to enable EEPROM device
•An external pull-down resistor of 4.7 KΩ is required.
• Resides in GbE Standby Power Well.
EESK O Yes
• EEPROM Shift Clock. Clock for the EEPROM Interface (~ 1 MHz)
•An external pull-down resistor of 4.7 KΩ is required.
• Resides in GbE Standby Power Well.

Intel EP80579 Specifications

General

Brand	Intel
Model	EP80579
Category	Computer Hardware
Language	English