LAN9312 datasheet(45/458 Pages) SMSC

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

Datasheet

SMSC LAN9312

Revision 1.2 (04-08-08)

DATASHEET

4.2.4.2

Hard-Straps

Hard-straps are latched upon Power-On Reset (POR) or pin reset (nRST) only. Unlike soft-straps,

hard-straps always have an associated pin and cannot be overridden by the EEPROM Loader. These

straps are used as either direct configuration values or as register defaults. Table 4.3 provides a list of

all hard-straps and their associated pin. These straps, along with their pin assignments are also fully

defined in Chapter 3, "Pin Description and Configuration," on page 26.

manual_FC_strap_2

Port 2 Manual Flow Control Enable Strap: Configures the

default value of the Port 2 Full-Duplex Manual Flow Control

Select (MANUAL_FC_2) bit in the Port 2 Manual Flow

Control Register (MANUAL_FC_2). When configured low,

flow control is determined by auto-negotiation (if enabled),

and symmetric PAUSE is advertised (bit 10 of the Port x

PHY Auto-Negotiation Advertisement Register

(PHY_AN_ADV_x) is set).

When configured high, flow control is determined by 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, and symmetric PAUSE is not

advertised (bit 10 of the Port x PHY Auto-Negotiation

Advertisement Register (PHY_AN_ADV_x) is cleared).

BP_EN_strap_mii

Port 0(Host MAC) Backpressure Enable Strap:

Configures the default value for the Port 0 Backpressure

Enable (BP_EN_MII) bit of the Port 0(Host MAC) Manual

Flow Control Register (MANUAL_FC_MII). When

configured low, backpressure is disabled. When configured

high, backpressure is enabled.

FD_FC_strap_mii

Port 0(Host MAC) Full-Duplex Flow Control Enable

Strap: Configures the default of the TX_FC_MII and

RX_FC_MII bits in the Port 0(Host MAC) Manual Flow

Control Register (MANUAL_FC_MII) which are used when

manual full-duplex flow control is selected. When

configured low, flow control is disabled on RX/TX. When

configured high, flow control is enabled on RX/TX.

manual_FC_strap_mii

Port 0(Host MAC) Manual Flow Control Enable Strap:

Configures the default value of the MANUAL_FC_MII bit in

the Port 0(Host MAC) Manual Flow Control Register

(MANUAL_FC_MII). When configured low, flow control is

determined by Virtual Auto-Negotiation (if enabled). When

configured high, flow control is determined by TX_FC_MII

and RX_FC_MII bits in the Port 0(Host MAC) Manual Flow

Control Register (MANUAL_FC_MII).

SQE_test_disable_strap_mii

SQE Heartbeat Disable Strap: Configures the Signal

Quality Error (Heartbeat) test function by controlling the

default value of the SQEOFF (bit 0) of the Virtual PHY

Special Control/Status Register

(VPHY_SPECIAL_CONTROL_STATUS). When configured

low, SQEOFF defaults to 0 and SQE test is enabled. When

configured high, SQEOFF defaults to 1 and SQE test is

disabled.

Table 4.2 Soft-Strap Configuration Strap Definitions (continued)

STRAP NAME

DESCRIPTION

PIN / DEFAULT

VALUE

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