EP80579 Datasheet, PDF (1882/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 49-73. DC Output Characteristics: EEPROM Interface
Symbol
Parameter
V_OH
Output high voltage
V_OL
Output low voltage
Conditions
V_CC = 2.5V
I_OH = -1mA
V_CC = Min
I_OL = 1mA
Min Typical
Max
Units
2.4
-
=VCCSUS25
V
-
-
0.4
V
49.5.13.2.3 GbE DC Clock Specifications
Table 49-74. Reference Clock DC Input Specification: (GBE_REFCLK_RMII, GBE_REFCLK)
Symbol
Parameter
Conditions
Min Typical Max
Units
Notes
V_IH
Input high voltage
V_IH > V_{IH_Min}
V_CC = Min
1.7
-
3.6
V
-
V_IL
Input low voltage
V_IH > V_{IL_Max}
V_CC = Min
-
-
0.7
V
-
I_IH
Input high current
V_CC = Max
V_IN = 2.5 V
-
-
15
uA
-
I_IL
Input low current
V_CC = Max
-15
V_IN = 0.4 V
-
-
uA
-
C_IN
Input pin cap
-
-
8
pF
Note 1
Notes:
1.
Guaranteed by design. These values are typical values seen for this process, but not measured during
production testing.
49.5.13.3 Gigabit Ethernet AC Characteristics
49.5.13.3.1 Frequency Requirements
Table 49-75 provides the frequency of all input clocks in a different mode of operation.
Table 49-75. Frequencies of All Input Clocks
Model
RMII
RGMII
Clock Name
GBE_REFCLK_RMII
GBEn_RxCLK
GBEn_TxCLK
GBE_REFCLK
Frequency
50 MHz
2.5/25/125 MHz
2.5/25/125 MHz
125 MHz
49.5.13.3.2 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
transmission and receive are done with respect to TXCLK and RXCLK. In RGMII mode,
TXCLK and RXCLK run at 2.5/25/125MHz. In 2.5/25MHz mode, both transmit and
receive occurs on rising edges of the clock. At 125MHz, data transfer (both Tx and Rx)
occurs on both edges of the clock (same as DDR2).
The RGMII interface gets Rx clock from the PHY and Tx clock from the MAC. Both MAC
and PHY receive a 125MHz reference clock from the board. The RGMII outputs uses
2.5V drivers that are 3.3V tolerant. Figure 49-34 shows the GbE block diagram with the
signal connections in RGMII mode.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1882
August 2009
Order Number: 320066-003US