LAN9313 Datasheet, PDF (51/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
Table 4.3 Hard-Strap Configuration Strap Definitions
STRAP NAME
eeprom_size_strap[1:0]
MII_mode_strap
phy_addr_sel_strap
DESCRIPTION
PIN
EEPROM Size Strap [1:0]: Configures the EEPROM size
range as specified in Section 8.2, "I2C/Microwire Master
EEPROM Controller," on page 101.
EEPROM_SIZE_[1:0]
MII Mode Strap: Configures the default mode of the
external MII port.
MII_MODE
0 = MAC Mode
1 = PHY Mode
Refer to Section 2.3, "Modes of Operation," on page 23 for
additional information on the various modes of the
LAN9313/LAN9313i.
PHY Address Select Strap: Configures the default MII
PHY_ADDR_SEL
management address values for the PHYs and Virtual PHY
as detailed in Section 7.1.1, "PHY Addressing," on page 84.
4.3
0
0
1
2
1
1
2
3
Power Management
The LAN9313/LAN9313i Port 1 and Port 2 PHYs support several power management and wakeup
features.
4.3.1
Port 1 & 2 PHY Power Management
The Port 1 & 2 PHYs provide independent general power-down and energy-detect power-down modes
which reduce PHY power consumption. General power-down mode provides power savings by
powering down the entire PHY, except the PHY management control interface. General power-down
mode must be manually enabled and disabled as described in Section 7.2.9.1, "PHY General Power-
Down," on page 97.
In energy-detect power-down mode, the PHY will resume from power-down when energy is seen on
the cable (typically from link pulses). If the ENERGYON interrupt (INT7) of either PHYs Port x PHY
Interrupt Mask Register (PHY_INTERRUPT_MASK_x) is unmasked, then the corresponding PHY will
generate an interrupt. These interrupts are reflected in the Interrupt Status Register (INT_STS) bit 27
(PHY_INT2) for the Port 2 PHY, and bit 26 (PHY_INT1) for the Port 1 PHY. These interrupts can be
used to trigger the IRQ interrupt output pin, as described in Section 5.2.3, "Ethernet PHY Interrupts,"
on page 55. Refer to Section 7.2.9.2, "PHY Energy Detect Power-Down," on page 97 for details on the
operation and configuration of the PHY energy-detect power-down mode.
SMSC LAN9313/LAN9313i
51
DATASHEET
Revision 1.2 (04-08-08)