LAN9312 datasheet(246/458 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)

246

SMSC LAN9312

DATASHEET

14.2.8.1

Virtual PHY Basic Control Register (VPHY_BASIC_CTRL)

This read/write register is used to configure the Virtual PHY.

Note:

This register is re-written in its entirety by the EEPROM Loader following the release or reset

or a RELOAD command. Refer to Section 10.2.4, "EEPROM Loader," on page 149 for more

information.

Offset:

Index (decimal):

1C0h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:16

RESERVED

(See Note 14.16)

Reset (VPHY_RST)

When set, this bit resets all the Virtual PHY registers to their default state.

This bit is self clearing.

0: Normal Operation

1: Reset

R/W

Loopback (VPHY_LOOPBACK)

This bit enables/disables the loopback mode. When enabled, transmissions

from the Host MAC are not sent to the switch fabric. Instead, they are looped

back onto the receive path.

0: Loopback mode disabled (normal operation)

1: Loopback mode enabled

R/W

Speed Select LSB (VPHY_SPEED_SEL_LSB)

This bit is used to set the speed of the Virtual PHY when the Auto-

Negotiation (VPHY_AN) bit is disabled.

0: 10 Mbps

1: 100 Mbps

R/W

Auto-Negotiation (VPHY_AN)

This bit enables/disables Auto-Negotiation. When enabled, the Speed Select

LSB (VPHY_SPEED_SEL_LSB) and Duplex Mode (VPHY_DUPLEX) bits

are overridden.

0: Auto-Negotiation disabled

1: Auto-Negotiation enabled

R/W

Power Down (VPHY_PWR_DWN)

This bit is not used by the Virtual PHY and has no effect.

R/W

Isolate (VPHY_ISO)

This bit is not used by the Virtual PHY and has no effect.

R/W

Restart Auto-Negotiation (VPHY_RST_AN)

When set, this bit updates the emulated Auto-Negotiation results.

0: Normal operation

1: Auto-Negotiation restarted

R/W

Duplex Mode (VPHY_DUPLEX)

This bit is used to set the duplex when the Auto-Negotiation (VPHY_AN) bit

is disabled.

0: Half Duplex

1: Full Duplex

R/W

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