AM79C873KCW datasheet(30/44 Pages) AMD

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Am79C873

PRELIMINARY

10BASE-T Conﬁguration/Status

(10BTCSRSCR) - Register 18

Bit

Bit Name

Default

Description

18.15

Reserved

0, RO

Reserved:

Write as 0, ignore on read.

18.14

LP_EN

1, RW

Link Pulse Enable:

1=Transmission of link pulses enabled.

0=Link pulses disabled, good link condition forced.

This bit is valid only in 10 Mbps operation.

18.13

HBE

Inverse Pin 94,

Heartbeat Enable:

1=Heartbeat function enabled.

0=Heartbeat function disabled.

When the NetPHY-1 device is conﬁgured for Full Duplex operation, this bit

will be ignored (the collision/heartbeat function is invalid in Full Duplex

mode). The initial state of this bit is the inverse value of RPTR/NODE input

pin at power on reset.

18.12

Reserved

0, RO

Reserved:

Write as 0, ignore on read.

18.11

JABEN

1, RW

Jabber Enable:

1= Jabber function enabled.

0= Jabber function disabled.

Enables or disables the Jabber function when the NetPHY-1 device is in

10BASE-T Full Duplex or 10BASE-T Transceiver Loop-back mode.

18.10

10BT_SER

Pin 98, RW

10BASE-T Serial Mode:

1=10BASE-T serial mode selected.

0=10BASE-T nibble mode selected.

The value on the 10BTSER input pin is latched into this bit at power-up/

rese.t

Serial mode not supported for 100 Mbps operation.

18.9-18.1

Reserved

0, RO

Reserved:

Write as 0, ignore on read.

18.0

POLR

0, RO

Polarity Reversed:

When this bit is set to 1, it indicates that the 10M cable polarity is reversed.

This bit is set and cleared by 10BASE-T module automatically.

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