Datasheet

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

15 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.

8 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].

7 LP_DIS 0, RW Normal Link Pulse Disable:

1 = Transmission of NLPs is disabled.

0 = Transmission of NLPs is enabled.

6 FORCE_LINK_10 0, RW Force 10Mb Good Link:

1 = Forced Good 10Mb Link.

0 = Normal Link Status.

5 RESERVED 0, RW RESERVED: Must be zero.

4 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.

3 RESERVED 0, RW RESERVED: Must be zero.

2 RESERVED 1, RW RESERVED: Must be set to one.

1 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.

0 JABBER_DIS 0, RW Jabber Disable:

Applicable only in 10BASE-T.

1 = Jabber function disabled.

0 = Jabber function enabled.

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