DP83849IFVSSLASHNOPB datasheet(90/108 Pages) TI2

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DP83849IF

SNOSAX8D – JUNE 2009 – REVISED APRIL 2013

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10.2.7

10 Base-T Status/Control Register (10BTSCR)

This register is used for control and status for 10BASE-T device operation.

Table 10-22. 10Base-T Status/Control Register (10BTSCR), address 1Ah

Bit

Bit Name

Default

Description

10BT_SERIAL

Strap, RW

10Base-T Serial Mode (SNI)

1 = Enables 10Base-T Serial Mode.

0 = Normal Operation.

Places 10 Mb/s transmit and receive functions in Serial Network Interface (SNI)

Mode of operation. Has no effect on 100 Mb/s operation.

14:1

RESERVED

0, RW

RESERVED: Must be zero.

11:9

SQUELCH

100, RW

Squelch Configuration:

Used to set the Squelch ON threshold for the receiver.

Default Squelch ON is 330mV peak.

LOOPBACK_10_DIS

0, RW

10Base-T Loopback Disable:

In half-duplex mode, default 10BASE-T operation loops Transmit data to the

Receive data in addition to transmitting the data on the physical medium. This is

for consistency with earlier 10BASE2 and 10BASE5 implementations which used

a shared medium. Setting this bit disables the loopback function.

This bit does not affect loopback due to setting BMCR[14].

LP_DIS

0, RW

Normal Link Pulse Disable:

1 = Transmission of NLPs is disabled.

0 = Transmission of NLPs is enabled.

FORCE_LINK_10

0, RW

Force 10Mb Good Link:

1 = Forced Good 10Mb Link.

0 = Normal Link Status.

RESERVED

0, RW

RESERVED: Must be zero.

POLARITY

RO/LH

10Mb Polarity Status:

This bit is a duplication of bit 12 in the PHYSTS register. Both bits will be cleared

upon a read of 10BTSCR register, but not upon a read of the PHYSTS register.

1 = Inverted Polarity detected.

0 = Correct Polarity detected.

RESERVED

0, RW

RESERVED: Must be zero.

RESERVED

1, RW

RESERVED: Must be set to one.

HEARTBEAT_DIS

0, RW

Heartbeat Disable: This bit only has influence in half-duplex 10Mb mode.

1 = Heartbeat function disabled.

0 = Heartbeat function enabled.

When the device is operating at 100Mb or configured for full duplex

operation, this bit will be ignored - the heartbeat function is disabled.

JABBER_DIS

0, RW

Jabber Disable:

Applicable only in 10BASE-T.

1 = Jabber function disabled.

0 = Jabber function enabled.

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