WJLXT972ALC.A4-857341 Cortina Systems Inc, WJLXT972ALC.A4-857341 Datasheet - Page 29

• Manufacturer Part Number: WJLXT972ALC.A4-857341
• Description: TXRX ETH 10/100 SGL PORT 64-LQFP
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT972ALC.A4-857341

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 1008-1042

LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
Figure 6
5.5.1
5.5.1.1
5.5.1.2
Cortina Systems
Auto-Negotiation
If not configured for forced operation, the LXT972A PHY 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 LXT972A PHY also supports the optional “Next Page” function as listed in
Auto-Negotiation Next Page Transmit Register - Address 7, Hex 7, on page 69 and
Table 47, Auto-Negotiation Link Partner Next Page Receive Register - Address 8, Hex 8,
on page 70.
Base Page Exchange
By exchanging Base Pages, the LXT972A PHY 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.
Manual Next Page Exchange
“Next Page Exchange” information is additional information that exceeds the information
required by Base Page exchange and that is sent by “Next Pages”. The LXT972A PHY
fully supports the IEEE 802.3 standard method of negotiation through the Next Page
exchange.
®
Link Establishment Overview
LXT972A Single-Port 10/100 Mbps PHY Transceiver
Auto-Negotiation
Go To Forced
Settings
Disable
Done
0.12 = 0
Power-Up, Reset,
or Link Failure
Check Value
Attempt Auto-
Start
0.12
Negotiation
0.12 = 1
YES
Listen for 100TX
Idle Symbols
Auto-Neg/Parallel Detection
Link Up?
Enable
NO
Listen for 10T
5.5 Establishing Link
Link Pulses
B3496-01
Table 46,
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