LAN9420-NU Standard Microsystems (SMSC), LAN9420-NU Datasheet - Page 74

• Manufacturer Part Number: LAN9420-NU
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9420-NU

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

Revision 1.4 (12-17-08)
3.7.2
the nPME signal upon detection of various power management events, such as an Ethernet “Wake On
LAN”, or upon detection of an Ethernet link status change.
As a result of the nPME assertion by the device, the PCI Host can reconfigure the power management
state. This mechanism is used, for example, when LAN9420/LAN9420i is in low power mode and must
be restored to a functional state, as a result of the detection of “Wake On LAN” event. The Host can
respond to the subsequent nPME assertion by changing the
bits in the
LAN9420/LAN9420i to the D0 state.
As a single function device, LAN9420/LAN9420i implements a
Register (PCI_PMC)
are mapped into the PCI configuration space at addresses 78h and 7Ch, respectively. The
Power Supply Current Draw (AUX_CURRENT)
setting of the external
register will always return zero, as the Data Register is not implemented.
LAN9420/LAN9420i complies with Revision 1.1 of the PCI Bus Power Management Interface
Specification, V2.0 of the Network Device Class Specification and Revision 3.0 of the Advanced
Configuration and Power Interface Specification (ACPI specification).
Refer to
management states.
Related External Signals and Power Supplies
The following external signals are provided in support of PCI power management:
Note: The nPME signal requires external isolation if the system supports wake from B3 and the
LAN9420/LAN9420i requires the following external 3.3V power supplies:
The connection of the device’s 3.3V power pins varies depending on the requirement for support of
wake from D3
power pins must be connected to the PCI system’s 3.3Vaux power supply. If wake from D3
disabled, (VAUXDET is connected to VSS), the 3.3V power pins must be connected to the system’s
+3.3V power. Please refer to
information on the LAN9420/LAN9420i power supplies.
Note: The LAN9420/LAN9420i device also requires 1.8V, but this is supplied by an internal regulator
nPME: LAN9420/LAN9420i can assert this signal upon detection of an enabled power management
event.
VAUXDET: This signal enables LAN9420/LAN9420i’s ability to detect power management events
and assert nPME from the D3
3.3Vaux power supply, wake from D3
disabled.
PWRGOOD: If VAUXDET is low (wake from D3
power. If VAUXDET is connected to 3.3Vaux (wake from D3
uses PWRGOOD to determine the state of the system’s +3.3V power supply. When VAUXDET is
high, the device is isolated from the PCI bus when PWRGOOD is deasserted and will ignore all
PCI transactions, including PCICLK and PCInRST.
VDD33IO, VDD33A, VDD33BIAS
LAN9420/LAN9420i’s VAUXDET=0 (i.e., the system is powered, but LAN9420/LAN9420i is not)
and connection does not vary. Since the 1.8V supply is derived from VDD33IO, there is no
need to discuss it separately.
Section 5.3, "Power Consumption," on page 156
PCI Power Management Control and Status Register (PCI_PMCSR)
COLD
. If wake from D3
and a
VAUXDET
PCI Power Management Control and Status Register
Chapter 2, "Pin Description and Configuration," on page 15
Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
COLD
DATASHEET
pin. The Data_Scale and Data_Select fields of the PCI_PMCSR
COLD
state (wake from D3
COLD
74
is enabled (VAUXDET is connected to 3.3Vaux), the 3.3V
is enabled. When tied to ground, wake from D3
field of the PCI_PMC register is dependant on the
COLD
is disabled) PWRGOOD must be tied to +3.3V
for power consumption in the various power
COLD
Power Management State (PM_STATE)
COLD
PCI Power Management Capabilities
). When tied to the PCI system’s
is enabled), LAN9420/LAN9420i
SMSC LAN9420/LAN9420i
(PCI_PMCSR), which
to restore
Datasheet
for more
3.3Vaux
COLD
COLD
is
is