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CY7B933-JXC 参数 Datasheet PDF下载

CY7B933-JXC图片预览
型号: CY7B933-JXC
PDF下载: 下载PDF文件 查看货源
内容描述: 的HOTLink发送器/接收器 [HOTLink Transmitter/Receiver]
分类和应用: 电信集成电路电信电路信息通信管理
文件页数/大小: 33 页 / 809 K
品牌: CYPRESS [ CYPRESS ]
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CY7B923  
CY7B933  
To clarify this correspondence, the following example shows  
the conversion from an FC-2 Valid Data Byte to a Transmission  
Character (using 8B/10B Transmission Code notation)  
Transmission Order  
Within the definition of the 8B/10B Transmission Code, the bit  
positions of the Transmission Characters are labeled a, b, c,  
d, e, i, f, g, h, j. Bit “a” shall be transmitted first followed by bits  
b, c, d, e, i, f, g, h, and j in that order. (Note that bit i shall be  
transmitted between bit e and bit f, rather than in alphabetical  
order.)  
FC-2  
45  
Bits:  
7654  
0100  
3210  
0101  
Converted to 8B/10B notation (note carefully that the order of  
bits is reversed):  
Valid and Invalid Transmission Characters  
Data Byte NameD5.2  
The following tables define the valid Data Characters and valid  
Special Characters (K characters), respectively. The tables  
are used for both generating valid Transmission Characters  
(encoding) and checking the validity of received Transmission  
Characters (decoding). In the tables, each Valid-Data-byte or  
Special-Character-code entry has two columns that represent  
two (not necessarily different) Transmission Characters. The  
two columns correspond to the current value of the running  
disparity (“Current RD–” or “Current RD+”). Running disparity  
is a binary parameter with either the value negative (–) or the  
value positive (+).  
Bits:  
ABCDE  
10100  
FGH  
010  
Translated to a transmission Character in the 8B/10B Trans-  
mission Code:  
Bits: abcdei fghj  
101001 0101  
Each valid Transmission Character of the 8B/10B Trans-  
mission Code has been given a name using the following  
convention: cxx.y, where c is used to show whether the Trans-  
mission Character is a Data Character (c is set to D, and the  
SC/D pin is LOW) or a Special Character (c is set to K, and the  
SC/D pin is HIGH). When c is set to D, xx is the decimal value  
of the binary number composed of the bits E, D, C, B, and A  
in that order, and the y is the decimal value of the binary  
number composed of the bits H, G, and F in that order. When  
c is set to K, xx and y are derived by comparing the encoded  
bit patterns of the Special Character to those patterns derived  
from encoded Valid Data bytes and selecting the names of the  
patterns most similar to the encoded bit patterns of the Special  
Character.  
After powering on, the Transmitter may assume either a  
positive or negative value for its initial running disparity. Upon  
transmission of any Transmission Character, the transmitter  
will select the proper version of the Transmission Character  
based on the current running disparity value, and the Trans-  
mitter shall calculate a new value for its running disparity  
based on the contents of the transmitted character. Special  
Character codes C1.7 and C2.7 can be used to force the trans-  
mission of a specific Special Character with a specific running  
disparity as required for some special sequences in X3.230.  
After powering on, the Receiver may assume either a positive  
or negative value for its initial running disparity. Upon reception  
of any Transmission Character, the Receiver shall decide  
whether the Transmission Character is valid or invalid  
according to the following rules and tables and shall calculate  
a new value for its Running Disparity based on the contents of  
the received character.  
Under the above conventions, the Transmission Character  
used for the examples above, is referred to by the name D5.2.  
The Special Character K29.7 is so named because the first six  
bits (abcdei) of this character make up a bit pattern similar to  
that resulting from the encoding of the unencoded 11101  
pattern (29), and because the second four bits (fghj) make up  
a bit pattern similar to that resulting from the encoding of the  
unencoded 111 pattern (7).  
The following rules for running disparity shall be used to  
calculate the new running-disparity value for Transmission  
Characters that have been transmitted (Transmitter’s running  
disparity) and that have been received (Receiver’s running  
disparity).  
Note: This definition of the 10-bit Transmission Code is based  
on (and is in basic agreement with) the following references,  
which describe the same 10-bit transmission code.  
A.X. Widmer and P.A. Franaszek. “A DC-Balanced, Parti-  
tioned-Block, 8B/10B Transmission Code” IBM Journal of  
Research and Development, 27, No. 5: 440-451 (September,  
1983).  
Running disparity for a Transmission Character shall be calcu-  
lated from sub-blocks, where the first six bits (abcdei) form one  
sub-block and the second four bits (fghj) form the other  
sub-block. Running disparity at the beginning of the 6-bit  
sub-block is the running disparity at the end of the previous  
Transmission Character. Running disparity at the beginning of  
the 4-bit sub-block is the running disparity at the end of the  
6-bit sub-block. Running disparity at the end of the Trans-  
mission Character is the running disparity at the end of the  
4-bit sub-block.  
U.S. Patent 4, 486, 739. Peter A. Franaszek and Albert X.  
Widmer. “Byte-Oriented DC Balanced (0.4) 8B/10B Parti-  
tioned Block Transmission Code” (December 4, 1984).  
Fibre Channel Physical and Signaling Interface (dpANS  
X3.230-199X ANSI FC-PH Standard).  
IBM Enterprise Systems Architecture/390 ESCON I/O  
Interface (document number SA22-7202).  
Running disparity for the sub-blocks shall be calculated as  
follows:  
8B/10B Transmission Code  
1. Running disparity at the end of any sub-block is positive if  
the sub-block contains more ones than zeros. It is also pos-  
itive at the end of the 6-bit sub-block if the 6-bit sub-block  
is 000111, and it is positive at the end of the 4-bit sub-block  
if the 4-bit sub-block is 0011.  
The following information describes how the tables shall be  
used for both generating valid Transmission Characters  
(encoding) and checking the validity of received Transmission  
Characters (decoding). It also specifies the ordering rules to  
be followed when transmitting the bits within a character and  
the characters within the higher-level constructs specified by  
the standard.  
2. Running disparity at the end of any sub-block is negative if  
the sub-block contains more zeros than ones. It is also  
Document #: 38-02017 Rev. *E  
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