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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) 42 SMSC LAN9311/LAN9311i
DATASHEET
speed_strap_1 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 14.4.2.1).
When configured low, 10 Mbps is selected. When
configured high, 100 Mbps is selected.
This strap also affects the default value of the following bits:
PHY_SPEED_SEL_LSB bit of the Port x PHY Basic
Control Register (PHY_BASIC_CONTROL_x)
10BASE-T Full Duplex (bit 6) and 10BASE-T Half Duplex
(bit 5) bits of the Port x PHY Auto-Negotiation
Advertisement Register (PHY_AN_ADV_x)
MODE[2:0] bits of the Port x PHY Special Modes Register
(PHY_SPECIAL_MODES_x)
Refer to the respective register definition sections for
additional information.
1b
duplex_strap_1 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 14.4.2.1).
When configured low, half-duplex is selected. When
configured high, full-duplex is selected.
This strap also affects the default value of the following bits:
PHY_DUPLEX bit of the Port x PHY Basic Control
Register (PHY_BASIC_CONTROL_x)
10BASE-T Full Duplex (bit 6) of the Port x PHY Auto-
Negotiation Advertisement Register (PHY_AN_ADV_x)
MODE[2:0] bits of the Port x PHY Special Modes Register
(PHY_SPECIAL_MODES_x)
Refer to the respective register definition sections for
additional information.
1b
BP_EN_strap_1 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 configured low, backpressure is
disabled. When configured high, backpressure is enabled.
1b
FD_FC_strap_1 Port 1 Full-Duplex Flow Control Enable Strap:
Configures the default value of the Port 1 Full-Duplex
Transmit Flow Control Enable (TX_FC_1) and Port 1 Full-
Duplex Receive Flow Control Enable (RX_FC_1) bits in the
Port 1 Manual Flow Control Register (MANUAL_FC_1),
which are used when manual full-duplex control is selected.
When configured low, full-duplex Pause packet detection
and generation are disabled. When configured high, full-
duplex Pause packet detection and generation are enabled.
1b
Table 4.2 Soft-Strap Configuration Strap Definitions (continued)
STRAP NAME DESCRIPTION
PIN / DEFAULT
VALUE