參數(shù)資料
型號(hào): MC92602ZTA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝: 15 X 15 MM, 1.60 MM HEIGHT, 1 MM PITCH, MAPBGA-196
文件頁(yè)數(shù): 84/102頁(yè)
文件大?。?/td> 1581K
代理商: MC92602ZTA
B-2
MC92602 SerDes Reference Manual
MOTOROLA
Overview
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
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 specified: 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
A simplified sequence of steps in 8B/10B coding is as follows:
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 3 and 5 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- 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.
One Coded Transmission Character (Byte)
jh
g
f
ie
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
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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