参数资料
型号: MC92604ZT
厂商: Freescale Semiconductor
文件页数: 10/122页
文件大小: 0K
描述: IC TXRX ETH DUAL GIG 196-MAPBGA
标准包装: 630
类型: 收发器
驱动器/接收器数: 2/2
规程: 千兆位以太网
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 196-LBGA
供应商设备封装: 196-MAPBGA(15x15)
包装: 托盘
MC92604 Dual Gigabit Ethernet Transceiver Reference Manual, Rev. 1
Freescale Semiconductor
B-1
Appendix B
8B/10B Coding Scheme
The MC92604 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’ through ‘j,’
representing bits 0–9, respectively. Character (bit) ordering in the fibre channel nomenclature is
little-endian, with ‘a’ 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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