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| 型號： | MC92600CJUB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA217 |
| 封裝： | 23 X 23 MM, 2.32 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-217 |
| 文件頁數(shù)： | 83/98頁 |
| 文件大小： | 1288K |
| 代理商： | MC92600CJUB |
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B-2
MC92600 SERDES User’s Manual
MOTOROLA
Overview
Figure B-2. Encoded Transmission Character Bit Ordering
B.1.1 Naming Transmission Characters
Transmission characters are given names based on the type of data in the byte and the bit
values of the character. Two types of transmission characters are specied: data and special.
Data characters are labeled “D” characters and special characters are labeled “K”
characters. Each transmission character has a bit value and a corresponding decimal value.
These elements are combined to provide each character with a name, see Table B-1.
B.1.2 Encoding
Following is a simplied sequence of steps in 8B/10B coding:
1. An 8-bit block of unencoded data (a transmission character) is picked up by a
transmitter.
2. The transmission character is broken into sub-blocks of three bits and ve bits. The
letters H G and F comprise the 3-bit block, and the letters E D C B and A comprise
the 5-bit block.
3. The 3-bit and 5-bit sub-blocks pass through a 3B/4B encoder and a 5B/6B encoder,
respectively. A bit is added to each sub-block, such that the transmission character
is encoded and expanded to a total of 10-bits.
4. At the time the character is expanded into 10 bits, it is also encoded into the proper
running disparity, either positive (RD+) or negative (RD-) depending on certain
calculations (see Section B.1.3, “Calculating Running Disparity”). At start-up, the
transmitter assumes negative running disparity.
One coded transmission character (Byte)
j
h
g
f
i
e
dcb
a
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
↑
lsb
Table B-1. Components of a Character Name
H G F
E D C B A
8B/10B notation
0 0 1
1 1 1 0 0
Data bit value
1
28
Decimal value of the bit value
D or K
Kind of transmission character
D28.1 = Data name assigned to this data byte if it is a data character.
K28.1 = Data name assigned to this data byte if it is a special character.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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