LAN9312 datasheet(44/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

SMSC LAN9312

DATASHEET

speed_strap_2

Port 2 Speed Select Strap: Configures the default value

for the Speed Select LSB (PHY_SPEED_SEL_LSB) bit in

the PHY_BASIC_CTRL_2 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.

duplex_strap_2

Port 2 Duplex Select Strap: Configures the default value

for the Duplex Mode (PHY_DUPLEX) bit in the

PHY_BASIC_CTRL_2 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

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.

BP_EN_strap_2

Port 2 Backpressure Enable Strap: Configures the

default value for the Port 2 Backpressure Enable

(BP_EN_2) bit of the Port 2 Manual Flow Control Register

(MANUAL_FC_2). When configured low, backpressure is

disabled. When configured high, backpressure is enabled.

FD_FC_strap_2

Port 2 Full-Duplex Flow Control Enable Strap:

Configures the default value of the Port 2 Full-Duplex

Transmit Flow Control Enable (TX_FC_2) and Port 2 Full-

Duplex Receive Flow Control Enable (RX_FC_2) bits in the

Port 2 Manual Flow Control Register (MANUAL_FC_2),

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.

Table 4.2 Soft-Strap Configuration Strap Definitions (continued)

STRAP NAME

DESCRIPTION

PIN / DEFAULT

VALUE

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