參數(shù)資料
型號(hào)： MC92603VF
廠商： Freescale Semiconductor
文件頁數(shù)： 15/126頁
文件大?。?/td> 0K
描述： IC TXRX ETH QUAD GIG 256-MAPBGA
標(biāo)準(zhǔn)包裝： 1
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 4/4
規(guī)程： 千兆位以太網(wǎng)
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 256-LBGA
供應(yīng)商設(shè)備封裝： 256-MAPBGA
包裝： 托盤
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual, Rev. 1
Freescale Semiconductor
B-1
Appendix B
8B/10B Coding Scheme
The MC92603 provides fibre channel-specific 8B/10B encoding and decoding based on the FC-1 fibre
channel standard. Given 8 bits entering a channel, the 8B/10B encoding converts them to 10 bits thereby
increasing the transition density of the serially transmitted signal.
B.1
Overview
The FC-1 standard applies an algorithm that ensures that no more than five 1s or 0s are transmitted
consecutively, giving a transition density equal to 2.5 for each 10-bit data block. Such a density ensures
proper DC balance across the link and is sufficient for good clock recovery.
In the 8B/10B notation scheme, bytes are referred to as transmission characters, and each bit is represented
by letters. Unencoded bits, the 8 bits that have not passed through a 8B/10B encoder, are represented by
letters ‘A’ through ‘H,’ which are bits 0 through 7.
Figure B-1. Unencoded Transmission Character Bit Ordering
Encoded bits, those that have passed through an encoder, are represented with the letters ‘a(chǎn)’ through ‘j,’
representing bits 0–9, respectively. Character (bit) ordering in the fibre channel nomenclature is
little-endian, with ‘a(chǎn)’ being the least significant bit in a byte.
Figure B-2. Encoded Transmission Character Bit Ordering
One unencoded transmission character (Byte)
H
G
F
E
D
C
B
A
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
lsb
One coded transmission character (Byte)
j
h
g
f
i
e
d
c
b
a
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
lsb
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