LAN83C183 datasheet(32/113 Pages) SMSC

32 / 113 page

SMSC DS – LAN83C183

Rev. 12/14/2000

The AutoNegotiation algorithm in the device meets all requirements specified in IEEE

802.3.

AutoNegotiation is only specified for 100BASE-TX and 10BASE-T operation, and

must be disabled when the device is placed in

100BASE-FX mode.

1.2.11.1 10BASE-T LINK INTEGRITY ALGORITHM (10 MBITS/S)

The device implements the same 10BASE-T link integrity algorithm defined in IEEE

802.3. This algorithm uses normal link pulses (NLPs), which are transmitted during

idle periods, to determine if a device has successfully established a link with a remote

device (called Link Pass state). The transmit link pulse meets the template

requirements defined in IEEE 802.3 and shown in Figure 1.6. Refer to IEEE 802.3

for more details if needed.

Figure 1.6 Link Pulse Output Voltage Template (10 Mbits/s)

1.2.11.2 100BASE-TX LINK INTEGRITY ALGORITHM (100 MBITS/S)

Because the IEEE 802.3 specification defines 100BASE-TX to have an active idle sig-

nal, there is no need to have separate link pulses such as those defined for 10BASE-

T. The LAN83C183 uses the squelch criteria and descrambler synchronization algo-

rithm on the input data to determine if the device has successfully established a link

with a remote device (called Link Pass state). Refer to IEEE 802.3 for more details if

needed.

1.2.11.3 AUTONEGOTIATION ALGORITHM

As stated previously, the AutoNegotiation algorithm is used for two purposes:

• To establish a link to and from a remote device

• To automatically configure the device for either 10 or 100 Mbits/s operation and

either Half- or Full-Duplex operation.

The AutoNegotiation algorithm is the same algorithm defined in IEEE 802.3 Clause

28. AutoNegotiation uses a burst of link pulses, called fast link pulses (FLPs), to pass

up to 16 bits of signaling data back and forth between the LAN83C183 and a remote

device. The transmit FLP pulses meet the template specified in IEEE 802.3 and

0 BT

1.3 BT

2.0 BT

+ 50 mV

− 50 mV

42.0 BT

2.0 BT

0.85 BT

− 3.1 V

585 mV

3.1 V

0.5 V/ns

+ 50 mV

− 50 mV

0.5 BT

0.6 BT

300 mV

4.0 BT

200 mV

0.25 BT

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