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MS87V1021 Datasheet(PDF) 35 Page - OKI electronic componets

Part # MS87V1021
Description  Recording and Playback IC with Built-in 2-Mbit DRAM
PDF  63 Pages
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Manufacturer  OKI [OKI electronic componets]
Direct Link  http://www.oki.com
Logo OKI - OKI electronic componets

MS87V1021 Datasheet(HTML) 35 Page - OKI electronic componets

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PEDS87V1021-01
1Semiconductor
MS87V1021
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Fast Forward/Rewind Playback (Valid only in Retroactive Play mode and Normal Mode)
Command
Code
Description
1st Byte
23h
Start fast forward or rewing playback
Unit[7:4]
Sets Unit value
Cue/Rew
2nd Byte
Speed[3:0]
Sets Speed value
Use this command, while playing, to start Fast Forward or Rewinding
playback from the point that is currently played. When you want to get the
speed back to normal X1 play, execute the Cue/Rew command again with
the Speed value of “0”. The Unit vlaue is ignored in this operation.
Unit Function
Speed Function
Combinations of Units and Speeds
The combination of the Unit value and the Speed value affects playback
sound. Therefore, choose a proper combination of the two values
depending on the type of sound to be played. The Fast Forward/Rewind
Play function is available only in Retroactive Play Mode and Normal mode.
If you use this function, you should not use the Block address FFh.
Note: The following restrictions apply to this function:
• The size of the sound data area must be 128 pages (i.e. 16 blocks) or
more.
• You may not use the block address FFh.
• The Cue/Rew command is unavailable for playback after an endless
recording session or repeat play by using the Play2 command.
Unit
Description
0
By unit of 1,024 bits
1
By unit of 2,0484 bits
2
By unit of 4,0964 bits
3
By unit of 8,192 bits
4
By unit of 16,384 bits
Speed
Description
Speed
Description
0
FF at X1 speed
8
Rewind at X1 speed
1
FF at X1.25 speed
9
Rewind at X1.25 speed
2
FF at X1.5 speed
A
Rewind at X1.5 speed
3
FF at X2 speed
B
Rewind at X2 speed
4
FF at X3 speed
C
Rewind at X3 speed
5
FF at X4 speed
D
Rewind at X4 speed
Speed
Unit
0
1
234
5
0X1
—
—
—
—
—
—
1
X1.25
—
—
2X1.5
—
3X2
4X3
5X4
8X1
—
—
—
—
—
—
9
X1.25
—
—
A
X1.5
—
BX2
CX3
DX4



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