82575EB Datasheet, PDF (12/62 Pages) Intel Corporation – Intel® 82575EB Gigabit Ethernet Controller Datasheet

Intel^® 82575EB Gigabit Ethernet Controller — PCI Express Interface
3.2 PCI Express Interface
Symbol
PER_0_N
PER_0_P
PER_1_N
PER_1_P
PER_2_N
PER_2_P
PER_3_N
PER_3_P
PET_0_N
PET_0_P
PET_1_N
PET_1_P
PET_2_N
PET_2_P
PET_3_N
PET_3_P
PE_RCOMP
PE_CLK_P
PE_CLK_N
PE_RST_N
PE_WAKE_N
Type
A(I)
Name and Function
High Speed Serial Receive Data
These signals connect to corresponding PETn and PETp signals on a system motherboard or a
PCI Express connector. Series AC coupling capacitors are required at the transmitter end. The
PCI Express differential inputs are clocked at 2.5 Gb/s.
A(0)
High Speed Serial Transmit Data
These signals connect to corresponding PERn and PERp signals on a system motherboard or a
PCI Express connector. Series AC coupling capacitors are required at the 82575EB end. The PCI
Express differential outputs are clocked at 2.5 Gb/s.
A
High Speed Serial Impedance Compensation
Connect the recommended resistor value 1.4K  from this ball to ground.
A
100 MHz Differential Clock for the PCI Express Interface
The reference clock is furnished by the system and has a 300 ppm frequency tolerance.
I
PCI Express Reset
When the signal is low, all PCI Express functions are held in reset. When the signal is high, it
denotes that main power is available to the 82575EB and the reference clock is running.
In systems with a PCI Express add-in card, this signal routes to the connector.
OD
Wake
The device drives this signal low when it receives a wake-up event and either the PME Enable bit
in the Power Management Control/Status Register or the Advanced Power Management Enable
(APME) bit of the Wake-up Control Register (WUC) is 1b.
3.3 Power Management Signals
Symbol
AUX_PWR
LAN0_DIS_N
LAN1_DIS_N
DEV_OFF_N
MAIN_PWR_OK
Type
I
I
I
I
Name and Function
Auxiliary Power Present.
If the Auxiliary Power signal is high, then auxiliary power is present and the 82575device
should support the D3_cold power state.
LAN Disables 0 and 1
Disables individual Ethernet ports. State is latched upon a rising edge of PERST_N or a PCI
Express reset event. This pin has an internal pull-up resistor.
Device Off
Asynchronously disables Ethernet controller.
Main Power OK
Indicates that platform main power is up. Must be connected externally.
Intel^® 82575EB Gigabit Ethernet Controller
Datasheet
12
317679-004
Revision: 2.11
January 2011