ELLXT971ABE.A4 Intel, ELLXT971ABE.A4 Datasheet - Page 39

• Manufacturer Part Number: ELLXT971ABE.A4
• Description: IC TRANS 3.3V ETHERNET 64-BGA
• Manufacturer: Intel
• Type: PHY Transceiverr

Specifications of ELLXT971ABE.A4

• Number Of Drivers/receivers: 1/1
• Protocol: IEEE 802
• Voltage - Supply: 3.14 V ~ 3.45 V
• Mounting Type: Surface Mount
• Package / Case: 64-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 870479

5.5
5.5.1
5.5.1.1
Datasheet
Document Number: 249414-003
Revision Date: June 18, 2004
Figure 9. Intel
Note: When a link is established by using parallel detection, the LXT971A Transceiver sets the duplex
Establishing Link
Figure 9
mode to half-duplex, as defined by the IEEE 802.3 standard.
Auto-Negotiation
If not configured for forced operation, the LXT971A 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 LXT971A Transceiver also supports the optional “Next Page” function as listed in
“Auto-Negotiation Next Page Transmit Register - Address 7, Hex 7” on page 95
“Auto-Negotiation Link Partner Next Page Receive Register - Address 8, Hex 8” on page
Base Page Exchange
By exchanging Base Pages, the LXT971A 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
LXT971A Transceiver Link Establishment Overview
Go To Forced
shows an overview of link establishment for the LXT971A Transceiver.
Disable
Settings
Done
0.12 = 0
Intel
Power-Up, Reset,
Waking up from
Sleep mode, or
Link Failure
Check Value
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
Start
Attempt Auto-
0.12
Negotiation
0.12 = 1
YES
Listen for 100TX
Idle Symbols
Auto-Neg/Parallel Detection
Link Up?
Enable
NO
Listen for 10T
Link Pulses
and
B3476-01
Table 53,
Table 52,
95.
39