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Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 46 SMSC LAN9311/LAN9311i
DATASHEET
4.3 Power Management
The LAN9311/LAN9311i Port 1 and Port 2 PHYs and the Host MAC support several power
management and wakeup features.
The LAN9311/LAN9311i can be programmed to issue an external wake signal (PME) via several
methods, including wake on LAN, wake on link status change (energy detect), and magic packet
wakeup. The PME signal is ideal for triggering system power-up using remote Ethernet wakeup events.
A simplified diagram of the logic that controls the PME and PME_INT signals can be seen in
Figure 4.1.
The PME module handles the latching of the Port 1 & 2 PHY Energy-Detect Status (ED_STS1 and
ED_STS2) and Wake-On LAN Status (WOL_STS) bits of the Power Management Control Register
(PMT_CTRL). This module also masks the status bits with the corresponding enable bits (ED_EN1,
ED_EN2, WOL_EN) and combines the results together to generate the PME_INT status bit in the
Interrupt Status Register (INT_STS). The PME_INT status bit is then masked with the PME_EN bit and
conditioned before becoming the PME output pin.
The PME output characteristics can be configured via the PME_TYPE, PME_IND, and PME_POL bits
of the Power Management Control Register (PMT_CTRL). These bits allow the PME to be open-drain,
active high push-pull, or active-low push-pull and configure the output to be continuous, or pulse for
50mS.
Table 4.3 Hard-Strap Configuration Strap Definitions
STRAP NAME DESCRIPTION PIN
eeprom_type_strap EEPROM Type Strap: Configures the EEPROM type.
0 = Microwire Mode
1 = I
2
C Mode
EEPROM_TYPE
eeprom_size_strap[1:0] EEPROM Size Strap [1:0]: Configures the EEPROM size
range as specified in Section 10.2, "I2C/Microwire Master
EEPROM Controller," on page 138.
EEPROM_SIZE_[1:0]
phy_addr_sel_strap PHY Address Select Strap: Configures the default MII
management address values for the PHYs and Virtual PHY
as detailed in Section 7.1.1, "PHY Addressing," on page 82.
PHY_ADDR_SEL
PHY_ADDR_SEL_STRAP
VALUE
VIRTUAL PHY
ADDRESS
PORT 1 PHY
ADDRESS
PORT 2 PHY
ADDRESS
0 012
1 123