LAN9312 datasheet(231/458 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

231

Revision 1.2 (04-08-08)

DATASHEET

14.2.6.2

Port 2 Manual Flow Control Register (MANUAL_FC_2)

This read/write register allows for the manual configuration of the switch Port 2 flow control. This

or Auto-Negotiated. Refer to Section 6.2.3, "Flow Control Enable Logic," on page 58 for additional

information.

Note:

The flow control values in the PHY_AN_ADV_2 register (see Section 14.4.2.5, on page 294)

within the PHY are not affected by the values of this register.

Offset:

1A4h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:7

RESERVED

Port 2 Backpressure Enable (BP_EN_2)

This bit enables/disables the generation of half-duplex backpressure on

switch Port 2.

0: Disable backpressure

1: Enable backpressure

R/W

Note 14.8

Port 2 Current Duplex (CUR_DUP_2)

This bit indicates the actual duplex setting of switch Port 2.

0: Full-Duplex

1: Half-Duplex

Note 14.9

Port 2 Current Receive Flow Control Enable (CUR_RX_FC_2)

This bit indicates the actual receive flow setting of switch Port 2.

0: Flow control receive is currently disabled

1: Flow control receive is currently enabled

Note 14.9

Port 2 Current Transmit Flow Control Enable (CUR_TX_FC_2)

This bit indicates the actual transmit flow setting of switch Port 2.

0: Flow control transmit is currently disabled

1: Flow control transmit is currently enabled

Note 14.9

Port 2 Full-Duplex Receive Flow Control Enable (RX_FC_2)

When the MANUAL_FC_2 bit is set, or Auto-Negotiation is disabled, this bit

enables/disables the detection of full-duplex Pause packets on switch Port 2.

0: Disable flow control receive

1: Enable flow control receive

R/W

Note 14.10

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

When the MANUAL_FC_2 bit is set, or Auto-Negotiation is disabled, this bit

enables/disables full-duplex Pause packets to be generated on switch Port

0: Disable flow control transmit

1: Enable flow control transmit

R/W

Note 14.10

Port 2 Full-Duplex Manual Flow Control Select (MANUAL_FC_2)

This bit toggles flow control selection between manual and auto-negotiation.

0: If auto-negotiation is enabled, the auto-negotiation function

determines the flow control of switch Port 2 (RX_FC_2 and TX_FC_2

values ignored). If auto-negotiation is disabled, the RX_FC_2 and

TX_FC_2 values are used.

1: TX_FC_2 and RX_FC_2 bits determine the flow control of switch Port

2 when in full-duplex mode

R/W

Note 14.11

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