參數(shù)資料
型號(hào)： MC92600
廠商： Motorola, Inc.
英文描述： High-speed, Full-duplex, Serial Data Interface(高速全雙工串行數(shù)據(jù)接口)
中文描述： 高速，全雙工，串行數(shù)據(jù)接口（高速全雙工串行數(shù)據(jù)接口）
文件頁數(shù)： 72/82頁
文件大?。?/td> 1056K
代理商： MC92600
A-2
MC92600 WarpLink Quad Users Manual
Overview
Figure A-2. Encoded Transmission Character Bit Ordering
A.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 speciTed: data and special.
Data characters are labeled òDó characters and special characters are labeled òKó
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 A-1.
Table A-1. Components of a Character Name
A.1.2 Encoding
Following is a simpliTed 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 Tve 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 A.1.3, òCalculating Running Disparityó). At start-up, the
transmitter assumes negative running disparity.
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
-
msb
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
K28.1 = Data name assigned to this special character
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