cy7b9334 Cypress Semiconductor Corporation., cy7b9334 Datasheet - Page 22

• Manufacturer Part Number: cy7b9334
• Description: Smpte Hotlink Transmitter/receiver
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-02014 Rev. *A
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 Trans-
mission Character is to be generated (encoded). The current
value 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 1 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
Receiver’s running disparity shall be searched for the received
Transmission Character. If the received Transmission
Character is found in the proper column, then the Trans-
mission 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. Independent 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 Receiver’s current running disparity for the next
received Transmission Character.
Table 2. Code Violations Resulting from Prior Errors
Valid Data Characters (SC/D = LOW)
Transmitted data character
Transmitted bit stream
Bit stream after error
Decoded data character
D10.0
D11.0
Name
D0.0
D1.0
D2.0
D3.0
D4.0
D5.0
D6.0
D7.0
D8.0
D9.0
Data
Byte
HGF
000
000
000
000
000
000
000
000
000
000
000
000
Bits
EDCBA
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
100111
011101
101101
110001
110101
101001
011001
111000
111001
100101
010101
110100
abcdei
Current RD−
RD
−
−
−
−
0100
0100
0100
1011
0100
1011
1011
1011
0100
1011
1011
1011
101010 1001
101010 1011
fghj
Character
D21.1
D21.0
011000
100010
010010
110001
001010
101001
011001
000111
000110
100101
010101
110100
abcdei
Current RD+
RD
−
−
+
+
1011
1011
1011
0100
1011
0100
0100
0100
1011
0100
0100
0100
fghj
Table 1. Valid Transmission Characters
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
Character in which the error occurred. Table 2 shows an
example of this behavior.
Byte Name
010101 0101
010101 0101
D30.7
D31.7
Character
D0.0
D1.0
D2.0
D5.2
.
.
.
.
D10.2
D10.2
000
000
000
010
111
111
765
D
.
.
.
.
RD
IN
−
−
+
+
Data
or Q
00000
00001
00010
00101
11110
11111
43210
OUT
.
.
.
.
Code Violation
111010 1010
111010 1010
Character
D23.5
CY7B9234
CY7B9334
Hex Value
Page 22 of 32
00
01
02
45
FE
FF
.
.
.
.
RD
+
+
+
+
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