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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)： | 21/118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.
21 of 118
April, 2002
2.2.6 FBI - 100 Mbps
The Five Bit Interface (FBI), or Symbol Interface, is a five bit wide
interface produced when the 4B5B encoder/ decoder is bypassed. The
FBI is primarily used for repeaters or Ethernet controllers that have
integrated encoder/decoders.
The FBI is identical to the MII, except:
The FBI data path is five bits wide, not nibble wide like the MII.
TXER pin is changed to be the fifth transmit data bit, TXD4.
RXER pin is changed to be the fifth receive data bit, RXD4.
CRS is asserted as long as the device is in the Link Pass state (CRS
no longer asserted/deasserted at beginning/end of packet).
COL is not valid.
RXDV is not valid.
TXEN is ignored.
2.2.7 FBI - 10 Mbps
The FBI is not available in 10 Mbps mode.
2.2.8 Selection of MII, RMII, or FBI
MII is the default interface to the MAC controller. RMII is selected by
asserting the RMII_EN pin, a global control.
The FBI is automatically enabled when the 4B5B encoder/ decoder is
bypassed. Bypassing the encoder/decoder passes the 5B symbols
between the receiver/transmitter directly to the FBI without any alteration
or substitutions. The 4B5B encoder/decoder can be bypassed by setting
the bypass encoder bit in the MI serial port Channel Configuration
register.
When the FBI is enabled, it may also be desirable to bypass the
scrambler/descrambler and disable the internal CRS loopback function.
The scrambler/ descrambler can be bypassed by setting the bypass
scrambler bit in the MI serial port Channel Configuration register. The
internal CRS loopback can be disabled by setting the TXEN to CRS
loopback disable bit in the MI serial port Channel Configuration register.
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