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

Datasheet

Table 4.2 Soft-Strap Configuration Strap Definitions (continued)

STRAP NAME

DESCRIPTION

PIN / DEFAULT

VALUE

 

 

 

 

 

speed_strap_2

Port 2 Speed Select Strap: Configures the default value

1b

 

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

1b

 

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

 

 

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.

 

 

 

 

BP_EN_strap_2

Port 2 Backpressure Enable Strap: Configures the

1b

 

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:

1b

 

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.

 

 

 

 

Revision 1.4 (08-19-08)

44

SMSC LAN9312

 

DATASHEET