參數(shù)資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網(wǎng)核心(100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心)
文件頁數(shù): 123/130頁
文件大小: 770K
代理商: E-110
Glossary
A-5
The 100BASE-TX and 100BASE-FX media standards used in Fast
Ethernet are both adopted from physical media standards first developed
by ANSI, the American National Standards Institute. The ANSI physical
media standards were originally developed for the Fiber Distributed Data
Interface (FDDI) LAN standard (ANSI standard X3T9.5), and are widely
used in FDDI LANs.
Rather than “reinventing the wheel” when it came to signaling at
100 Mbit/s, the Fast Ethernet standard adapted these two ANSI media
standards for use in the new Fast Ethernet medium specifications. The
T4 standard was also provided to make it possible to use lower-quality
twisted-pair wire for 100-Mbit/s Ethernet signals.
Frame
An Ethernet frame contains the following eight fields:
Preamble
Start of Frame Delimiter
Destination Address
Source Address
Length
Data
Pad (if necessary)
Frame Check Sequence
Frame Check Sequence (FCS)
The Ethernet transmit and receive algorithm uses the standard IEEE
802.3 four-byte FCS field to ensure data integrity. During data transmis-
sion, the E-110 core uses a 32-bit linear feedback shift register (LFSR)
to compute the value that will be sent in the FCS field. The FCS value
is a function of the content of the source address, destination address,
length, data, and pad fields. On data reception, the E-110 core preloads
the LFSR with all ones and updates this value with each byte received,
including the received FCS. If the final value in the LFSR does not match
a predetermined value after all bytes including the FCS are received, the
E-110 core flags an FCS error.
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