WJLXT972MLC.A4 S L7U9 Intel, WJLXT972MLC.A4 S L7U9 Datasheet - Page 34

• Manufacturer Part Number: WJLXT972MLC.A4 S L7U9
• Manufacturer: Intel

Specifications of WJLXT972MLC.A4 S L7U9

• Lead Free Status / RoHS Status: Compliant

Intel
5.5
5.5.1
5.5.1.1
34
Figure 6. Link Establishment Overview)
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
Note:
Establishing Link
Figure 6
When a link is established by parallel detection, the LXT972M Transceiver sets the duplex mode to
half-duplex, as defined by the IEEE 802.3 standard.
Auto-Negotiation
If not configured for forced operation, the LXT972M Transceiver attempts to auto-negotiate with
its link partner by sending Fast Link Pulse (FLP) bursts. Each burst consists of up to 33 link pulses
spaced 62.5 μs apart. Odd link pulses (clock pulses) are always present. Even link pulses (data
pulses) may be absent or present to indicate a ‘0’ or a ‘1’. Each FLP burst exchanges 16 bits of
data, which are referred to as a “link code word”. All devices that support auto-negotiation must
implement the “Base Page” defined by the IEEE 802.3 standard (Registers 4 and 5).
The LXT972M Transceiver also supports the optional “Next Page” function as listed in
“Auto-Negotiation Next Page Transmit Register - Address 7, Hex 7” on page 82
“Auto-Negotiation Link Partner Next Page Receive Register - Address 8, Hex 8” on page
Base Page Exchange
By exchanging Base Pages, the LXT972M Transceiver and its link partner communicate their
capabilities to each other. Both sides must receive at least three consecutive identical base pages for
negotiation to continue. Each side identifies the highest common capabilities that both sides
support, and each side configures itself accordingly.
Auto-Negotiation
Go To Forced
shows an overview of link establishment for the LXT972M Transceiver.
Settings
Disable
Done
0.12 = 0
Power-Up, Reset,
or Link Failure
Check Value
Start
Attempt Auto-
0.12
Negotiation
0.12 = 1
YES
Listen for 100TX
Idle Symbols
Auto-Neg/Parallel Detection
Link Up?
Enable
Document Number: 302875-005
NO
Revision Date: 27-Oct-2005
Listen for 10T
Link Pulses
and
B3496-01
Table 49,
Datasheet
Table 48,
82.