LAN9313 Datasheet, PDF (33/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
Note 3.4 When used as an output, the pin input buffer and pull-up are disabled.
Note 3.5
An external pull-up is required when the SMI or MII management interface is used. This
ensures that the IDLE state of the MDIO signal is logic 1. An external pull-up is
recommended when the SMI or MII management interface is not used to avoid a floating
signal.
Note 3.6
When used as an output, the pin input buffer is disabled. An external pull-down is
recommended when the SMI or MII management interface is not used to avoid a floating
signal.
Note 3.7 This signal is pulled high through an internal pull-up resistor at all times.
PIN
44
45,47
56
55
53
52
51
Table 3.5 Dedicated Configuration Strap Pins
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
LED Enable
Strap
LED_EN
LED Function LED_FUN[1:0]
Strap
Port 1 Auto-
MDIX Enable
Strap
AUTO_MDIX_1
Port 1 Auto
Negotiation
Enable Strap
AUTO_NEG_1
Port 1 Speed
Select Strap
SPEED_1
Port 1 Duplex
Select Strap
DUPLEX_1
Port 1
Backpressure
Enable Strap
BP_EN_1
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
IS
(PU)
Note 3.8
LED Enable Strap: Configures the default value
for the LED_EN bits in the LED Configuration
Register (LED_CFG). When latched low, all 8
LED/GPIO pins are configured as GPIOs. When
latched high, all 8 LED/GPIO pins are configured
as LEDs. See Note 3.9.
LED Function Straps: Configures the default
value for the LED_FUN bits in the LED
Configuration Register (LED_CFG). When latched
low, the corresponding bit will be cleared. When
latched high, the corresponding bit will be set. See
Note 3.9.
Port 1 Auto-MDIX Enable Strap: Configures the
default value for the Auto-MDIX functionality on
Port 1. When latched low, Auto-MDIX is disabled.
When latched high, Auto-MDIX is enabled. See
Note 3.9.
Port 1 Auto Negotiation Enable Strap:
Configures the default value for the Auto-
Negotiation (PHY_AN) enable bit in the
PHY_BASIC_CTRL_1 register (See
Section 13.2.2.1). When latched low, auto-
negotiation is disabled. When latched high, auto-
negotiation is enabled.
See Note 3.9.
Port 1 Speed Select Strap: Configures the default
value for the Speed Select LSB
(PHY_SPEED_SEL_LSB) bit in the
PHY_BASIC_CTRL_1 register (See
Section 13.2.2.1). When latched low, 10 Mbps is
selected. When latched high, 100 Mbps is selected.
See Note 3.9.
Port 1 Duplex Select Strap: Configures the
default value for the Duplex Mode (PHY_DUPLEX)
bit in the PHY_BASIC_CTRL_1 register (See
Section 13.2.2.1). When latched low, half-duplex is
selected. When latched high, full-duplex is
selected. See Note 3.9.
Port 1 Backpressure Enable Strap: Configures
the default value for the Port 1 Backpressure
Enable (BP_EN_1) bit of the Port 1 Manual Flow
Control Register (MANUAL_FC_1). When latched
low, backpressure is disabled. When latched high,
backpressure is enabled. See Note 3.9.
SMSC LAN9313/LAN9313i
33
DATASHEET
Revision 1.2 (04-08-08)