STV2310D STMicroelectronics, STV2310D Datasheet - Page 46

• Manufacturer Part Number: STV2310D
• Description: Video ICs Digital Video Decodr
• Manufacturer: STMicroelectronics
• Type: High Quality front end videor

Specifications of STV2310D

• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-64
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
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Magazine
Byte
Coding
Bit
Data Count (DC) Coding
The Data Count (DC) byte is coded according to the parity protection scheme defined in SMPTE
291M or ITU-R BT.1364 specifications, as applied to 8-bit coded data (i.e. bit 6 is the even parity
check of bits 0 to 5, bit 7 is bit 6 complement to 1). In 8-bit applications, the DC byte gives a value
as a 4-byte group.
The number of the group of 4 User Data Words (UDW) transferred for the corresponding TV line is
given in the DC byte using 6 bits.
Checksum (CS) Coding
The Checksum (CS) byte is coded according to the parity protection scheme defined in SMPTE
291M or ITU-R BT.1364 specifications, as applied to 8-bit coded data.
Bits 6 to 0 are the LSB bits of the result of the sum of the seven LSB bits of DID, SDID, DC and all
UDW bytes (any carry is dropped). Bit 7 is the complement of Bit 6.
User Data Word (UDW) Coding
As 00h and FFh codes are prohibited in ITU-R BT.656 specifications, each data byte is substituted
by a pair of bytes; these two bytes are respectively built with:
Data is transmitted in the same temporal order as for the Hardware Filtering.
The TV line value is also provided to the DOF block to prevent scrambling errors when the ancillary
data flow is re-mixed with the video flow.
User Data Word Filler
As data is coded according to the 8-bit application protocol described in SMPTE 291M and ITU-R
BT.1364 specifications, some extra bytes may be inserted into the User Data Word sequence.
These bytes code the value 80h which is meaningless and is used only to maintain a 4-byte UDW
modularity (in compliance with the above specifications). These meaningless bytes are also used to
maintain the most adequate 4-byte wise data storing format handled by the microcontroller.
When an application is running, it is important that these filler bytes are not processed as valid data
items.
UDW Coding for WST - Teletext B
For World System Teletext (WST) standards, the UDW coding scheme depends on the searched
frame code.
When the searched frame code is the usual code (27h), the two first UDW words code the
Magazine (3 bits) and the Page (5 bits) values. In this case, there is no need to perform a nibble split
on these two words.When the searched frame code is validated with a programmable value, a split
of the two first words is applied (as they may not be necessarily Hamming 8/4 coded).
The above bytes are followed by 80 bytes (respectively 64 bytes in 525/60Hz) resulting of the nibble
split of the 40 bytes (respectively 32 bytes in 525/60Hz) decoded from the current TV ancillary data.
●
●
The lower data nibble for the lower nibble of the 1
The upper data nibble for the lower nibble of the 2
Bit 6
1’s complement
7
Even parity
check for bits
[5:0]
Table 16: Magazine and Page Coding
6
Always 0
5
4
st
nd
byte.
byte.
3
Magazine value
2
1
STV2310
0