參數資料
型號： LQ80221
英文描述： LAN Transceiver
中文描述： 網絡收發(fā)器
文件頁數： 22/91頁
文件大?。?/td> 907K
代理商： LQ80221
80220/80221
MD400159/E
22
3.13 LINK INTEGRITY & AUTONEGOTIATION
3.13.1 General
The 80220/80221 can be configured to implement either
the standard ink ntegrity algorithms or he AutoNegotiation
algorithm.
The standard link integrity algorithms are used solely to
establish an active ink to and from a remote device. There
are different standard link integrity algorithms for 10 and
100 Mbps modes. The AutoNegotiation algorithm is used
for wo purposes: (1) To automatically configure he device
for either 10/100 Mbps and Half/Full Duplex modes, and
(2) to establish an active link to and from a remote device.
The standard ink ntegrity and AutoNegotiation algorithms
are described below.
3.13.2 10Base-T Link Integrity Algorithm - 10Mbps
The 80220/80221 uses the same 10Base-T link intergrity
algorithm that is defined in IEEE 802.3 Clause 14. This
algorithm uses normal ink pulses, referred o as NLP's and
transmitted during idle periods, to determine if a device
has successfully established a link with a remote device
(called Link Pass state). The transmit ink pulse meets the
template defined in IEEE 802.3 Clause 14 and shown in
Figure 7. Refer to IEEE 802.3 Clause 14 for more details
if needed.
3.13.3 100Base-TX Link Integrity Algorithm -100Mbps
Since 100Base-TX s defined to have an active dle signal,
then there is no need to have separate link pulses like
those defined for 10Base-T. The 80220/80221 uses the
squelch criteria and descrambler synchronization algo-
rithm on the input data to determine if the device has
successfully established a ink with a remote device (called
Link Pass state). Refer to IEEE 802.3 for both of these
algorithms for more details.
3.13.4 AutoNegotiation Algorithm
As stated previously, the AutoNegotiation algorithm is
used for two purposes: (1) To automatically configure the
device or either 10/100 Mbps and Half/Full Duplex modes,
and (2) to establish an active link to and from a remote
device. The AutoNegotiation algorithm is the same algo-
rithm that is defined in IEEE 802.3 Clause 28.
AutoNegotiation uses a burst of ink pulses, called fast ink
pulses and referred to as FLP's, to pass up to 16 bits of
signaling data back and forth between the 80220/80221
and a remote device. The transmit FLP pulses meet the
templated specified in IEEE 802.3 and shown in Figure 7.
A timing diagram contrasting NLP's and FLP's is shown in
Figure 8.
0 BT
1.3 BT
2.0 BT
4.0 BT
+50 mV
–50 mV
4.0 BT
42.0 BT
3.1 V
0.5 V/ns
0.5 BT
0.6 BT
300 mV
200 mV
585 mV
+50 mV
–50 mV
2.0 BT
0.85 BT
–3.1 V
0.25 BT
Figure 7. Link Pulse Output Voltage Template _ NLP, FLP
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