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參數(shù)資料
| 型號： | L84225 |
| 英文描述： | L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02 |
| 中文描述： | L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊，4月2日 |
| 文件頁數(shù)： | 43/118頁 |
| 文件大?。?/td> | 890K |
| 代理商： | L84225 |
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Functional Description
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
43 of 118
April, 2002
to either the 100Base-TX or 10Base-T link integrity algorithms
(depending on which mode was enabled by AutoNegotiation). Refer to
IEEE 802.3 Clause 28 for more details.
2.14.5 AutoNegotiation Outcome Indication
The outcome or result of the AutoNegotiation process is stored in the
speed detect and duplex detect bits in the MI serial port Status Output
register.
2.14.6 AutoNegotiation Status
The status of the AutoNegotiation process can be monitored by reading
the AutoNegotiation Acknowledgement Bit in the MI serial port Status
register.
2.14.7 AutoNegotiation Enable
The AutoNegotiation algorithm can be enabled (or restarted) by setting
the AutoNegotiation enable bit in the MI serial port Control register or by
asserting the ANEG pin. The AutoNegotiation enable bit and ANEG pin
both have to be high to enable AutoNegotiation. When the
AutoNegotiation algorithm is enabled, the device halts all transmissions
including link pulses for 1200-1500 ms, enters the Link Fail state, and
restarts the negotiation process. When the AutoNegotiation algorithm is
disabled, the selection of 100 Mbps or 10 Mbps mode is determined by
the speed select bit in the MI serial port Control register, and the
selection of Half or Full Duplex is determined by the duplex select bit in
the MI serial port Control register.
2.14.8 AutoNegotiation Reset
The AutoNegotiation algorithm can be initiated at any time by setting the
AutoNegotiation reset bit in the MI serial port Control register.
2.14.9 Link Indication
Receive link detect activity can be monitored through the link detect bit
in the MI serial port Status and Status Output registers or it can also be
programmed to appear on LED status pins by appropriately setting the
programmable LED select bits in the MI serial port Configuration 2
register as shown in
Table 4
. Whenever the LED Status pins are
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