參數(shù)資料
型號： CYP15G0401DXA
廠商： Cypress Semiconductor Corp.
英文描述： Quad HOTLink II Transceiver
中文描述： 四HOTLink II收發(fā)器
文件頁數(shù)： 41/48頁
文件大?。?/td> 1115K
代理商： CYP15G0401DXA
CYP15G0401DXA
PRELIMINARY
Document #: 38-02002 Rev. *B
Page 41 of 48
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 accord-
ing to the following rules and tables and shall calculate a new
value for its Running Disparity based on the contents of the
received character.
The following rules for running disparity shall be used to cal-
culate the new running-disparity value for Transmission Char-
acters that have been transmitted (Transmitter
’
s running dis-
parity) and that have been received (Receiver
’
s running
disparity).
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 Transmission Character is
the running disparity at the end of the 4-bit sub-block.
Running disparity for the sub-blocks shall be calculated as fol-
lows:
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.
2. Running disparity at the end of any sub-block is negative if
the sub-block contains more zeros than ones. It is also neg-
ative at the end of the 6-bit sub-block if the 6-bit sub-block
is 111000, and it is negative at the end of the 4-bit sub-block
if the 4-bit sub-block is 1100.
3. Otherwise, running disparity at the end of the sub-block is
the same as at the beginning of the sub-block.
Use of the Tables for Generating Transmission Characters
The appropriate entry in the table shall be found for the Valid
Data byte or the Special Character byte for which a Transmis-
sion Character is to be generated (encoded). The current val-
ue of the Transmitter
’
s running disparity shall be used to select
the Transmission Character from its corresponding column.
For each Transmission Character transmitted, a new value of
the running disparity shall be calculated. This new value shall
be used as the Transmitter
’
s current running disparity for the
next Valid Data byte or Special Character byte to be encoded
and transmitted.
Table 22
shows naming notations and examples
of valid transmission characters.
Use of the Tables for Checking the Validity of Received
Transmission Characters
The column corresponding to the current value of the Receiv-
er
’
s running disparity shall be searched for the received Trans-
mission Character. If the received Transmission Character is
found in the proper column, then the Transmission Character
is valid and the associated Data byte or Special Character
code is determined (decoded). If the received Transmission
Character is not found in that column, then the Transmission
Character is invalid. This is called a code violation. Indepen-
dent of the Transmission Character
’
s validity, the received
Transmission Character shall be used to calculate a new value
of running disparity. The new value shall be used as the Re-
ceiver
’
s current running disparity for the next received Trans-
mission Character.
Detection of a code violation does not necessarily show that
the Transmission Character in which the code violation was
detected is in error. Code violations may result from a prior
error that altered the running disparity of the bit stream which
did not result in a detectable error at the Transmission Char-
acter in which the error occurred.
Table 23
shows an example
of this behavior.
Table 22. Valid Transmission Characters
Data
Byte Name
D
IN
or Q
OUT
765
Hex Value
43210
D0.0
000
00000
00
D1.0
000
00001
01
D2.0
000
00010
02
.
.
.
.
.
.
.
.
D5.2
010
00010
1
45
.
.
.
.
.
.
.
.
D30.7
111
11110
FE
D31.7
111
11111
FF
Table 23. Code Violations Resulting from Prior Errors
RD
Character
D21.1
101010 1001
101010 1011
D21.0
RD
+
+
Character
D10.2
010101 0101
010101 0101
D10.2
RD
+
+
Character
D23.5
111010 1010
111010 1010
Code Violation
RD
+
+
+
+
Transmitted data character
Transmitted bit stream
Bit stream after error
Decoded data character
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參數(shù)描述
CYP15G0401DXA-BGC 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Quad HOTLink II Transceiver
CYP15G0401DXA-BGI 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Quad HOTLink II Transceiver
CYP15G0401DXB 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Quad HOTLink II Transceiver
CYP15G0401DXB_05 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Quad HOTLink II⑩ Transceiver
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