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| 型号： | WJLXT971ALC.A4-857344 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64 |
| 文件页数： | 22/80页 |
| 文件大小： | 931K |
| 代理商： | WJLXT971ALC.A4-857344 |
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Page 29
Cortina Systems LXT972A Single-Port 10/100 Mbps PHY Transceiver
LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
5.5 Establishing Link
5.5.1
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 Table 46,
5.5.1.1
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.
5.5.1.2
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.
Figure 6
Link Establishment Overview
Check Value
0.12
Start
Done
Enable
Auto-Neg/Parallel Detection
Go To Forced
Settings
Attempt Auto-
Negotiation
Listen for 10T
Link Pulses
Listen for 100TX
Idle Symbols
Link Up?
NO
YES
Power-Up, Reset,
or Link Failure
Disable
Auto-Negotiation
0.12 = 0
0.12 = 1
B3496-01
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| WJLXT971ALE.A4-857343 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
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