ml87v2105 Oki Semiconductor, ml87v2105 Datasheet - Page 19

• Manufacturer Part Number: ml87v2105
• Description: Video Signal Noise Reduction Ic With A Built-in 5.6 Mbit Frame Memory
• Manufacturer: Oki Semiconductor

1.1.7 Stop Memory Write Setting
OKI Semiconductor
By setting the I
stop writing data to the memory. When you do this, the noise reduction feature stops, and until you set the start
of writing, the data retained in the memory is output as a still image.
Further, by setting STLM[1:0](SUB:43h-bit[4:3]), you can select the output mode for the still image from
among the following: field still image, frame still image, or frame median still image.
The still image data output is achieved by rewriting only the signals read from the memory for the valid data
period selected by the IBLK signal, which indicates the valid data. Therefore, it is necessary to input the input
sync signals as normal.
The data output as a field or frame (median) still image is based on the most recent data written to the memory
(before the writing was stopped).
The timing of the writing stop and restoration can be set in one of thee modes: selected field A/B, field A output,
and field B output.
In the timing for field A output, after the field A writing is completed, writing is stopped from the next field B
vertical sync signal. Writing is restored with the field B vertical sync signal.
In the timing for field B output, after the field B writing is completed, writing is stopped from the next field A
vertical sync signal. Writing is restored with the field A vertical sync signal.
Memory data
Memory data
Memory data
Memory data
[Field A output setting example 1]
[Field A output setting example 2]
[Field B output setting example 1]
[Field B output setting example 2]
Field
IWE
Field
IWE
Field
IWE
Field
IWE
IVS
IVS
IVS
IVS
[0]
0
0
0
1
1
1
B
A
B
A
2
C-bus settings register STL[2:0] (SUB:43h-bit[2:0]), you can stop the generation of IWE and
STL
A
B
A
B
[1]
X
X
0
1
0
1
Figure F1-1-7 (1) Writing Stop/Restoration Timing
B
[2]
A
A
B
0
0
1
0
0
1
Stop write setting
Table F1-1-7(1) Writing Stop Settings
B
A
B
A
Possible (field A restoration)
Possible (field B restoration)
Possible (either field restoration)
Stopped (field A maintained, still image output)
Stopped (field B maintained, still image output)
Stopped (either field output maintained, still image output)
B
A
A
B
A
B
Input data writing status
B
A
B
A
Rostore write setting
B
A
A
B
A
B
A
B
B
A
B
A
PEDL87V2105-02
B
A
ML87V2105
A
B
A
B
B
A
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