DP83848JSQ datasheet(57/80 Pages) TI

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7.2.8 10Base-T Status/Control Register (10BTSCR)

Table 28. 10Base-T Status/Control Register (10BTSCR), address 0x1A

Bit

Bit Name

Default

Description

RESERVED

0, RW

RESERVED:

Must be zero.

14:12

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_D

0, RW

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.

4POLARITY

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 func-

tion 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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