STV0974E/TR STMicroelectronics, STV0974E/TR Datasheet - Page 19

• Manufacturer Part Number: STV0974E/TR
• Description: IC DSP IMAGING VGA CMOS 6X6TFBGA
• Manufacturer: STMicroelectronics

Specifications of STV0974E/TR

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 56-TFBGA
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• For Use With: 497-3891 - KIT DEMO W/VS6552
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3887-2; STV0974E/TR

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Functional description
The Huffman table used are described in ISO DIS 10918-1 Annex A - Section K.3.
Figure 11: Encoding of AC coefficient
In the above example, the first AC coefficient of Block Y1 is 0, as good as the second one. The
zeros are not Huffman encoded, but the runlength counts them. When the first non-zero value is
reached (Coefficient 4 with value 77), the Huffman code for the pair (number of preceding zeros,
value) = (2,77) if Huffman encoded.
The code that is generated is Code = Huffman (2,77).
DC
12
1
2
0
Block Y1 data values
0
3
4
77
AC
DCT coefficient numbers in zigzag order
63
1
64
0
DC
1
4
2
5
Block Y2 data values
22
3
10
4
AC
63
0
64
0
STV0974