LC8213K Datasheet, PDF (4/5 Pages) Sanyo Semicon Device – Image Data Compression/Expansion Processor

LC8213K
Continued from preceding page.
Pin No.
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Pin name
DTC
V_SS
V_DD
MA23
MA22
MA21
MA20
MA19
MA18
MA17
MA16
MA/MD15
V_SS
MA/MD14
MA/MD13
MA/MD12
MA/MD11
MA/MD10
MA/MD9
MA/MD8
MA/MD7
V_SS
V_DD
MA/MD6
MA/MD5
MA/MD4
MA/MD3
MA/MD2
MA/MD1
MA/MD0
I/O
Function
O DMA transfer complete signal
P Ground
P Power supply
O
O
O
O
Upper 8 bits of the image memory address
O
O
O
O
B Lower 16 bits of the image memory address/16-bit data bus
P Ground
B
B
B
B
Lower 16 bits of the image memory address/16-bit data bus
B
B
B
B
P Ground
P Power supply
B
B
B
B Lower 16 bits of the image memory address/16-bit data bus
B
B
B
Functional Description
• Encoding method
Conforms to the MH, MR, and MMR encoding methods of the ITU-T T.4 and T.6 recommendations, which are the
standards for G3 and G4 facsimile.
• Processing modes
Processing is performed in block units, and the number of lines processed can be set to be up to 64k lines. Processing can
also be performed in single line units. The LC8213K includes two FIFO systems, one for encoding and one for decoding,
so it is also possible to perform encoding and decoding alternately in units of several lines. In encoding mode, data is
read out sequentially from the image memory start address loaded into a register and encoded. The encoded data is
written to the encoding FIFO. The CPU is interrupted after the specified number of lines of data have been encoded. In
decoding mode, encoded data is read out of the decoding FIFO and decoded. The image data is recovered and written to
image memory. The CPU is interrupted after the specified number of lines of data have been decoded or a decoding error
occurs.
• Line skip mode
This is a mode in which the amount of code for a completely white line is set to half the set minimum number of
transmission bits. A line skip bit, which is used to recognize that a line is completely white, is added after the EOL code,
and fill bits are added so that the amount of code is one half the minimum number of transmission bits. For lines that are
not all white, the normal coded data is transmitted after the line skip bit.
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