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LC72720YVS Datasheet(PDF) 10 Page - ON Semiconductor

Part # LC72720YVS
Description  Signal-Processing System IC
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LC72720YVS Datasheet(HTML) 10 Page - ON Semiconductor

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LC72720YVS
No. A2155-10/18
(2) Synchronization detection method setting (1bit) : BS
BS
Synchronization detection conditions
0
If during 3 blocks, 2 blocks of offset words were detected in the correct order.
1
If the offset words were detected in the correct order in 2 consecutive blocks.
Initial value : BS = 0
(3) Synchronization and RAM address reset (1bit) : SYR
SYR
Synchronization detection circuit
RAM
0
Normal operation (reset cleared)
Normal write (See the description of the OWE bit)
1
Forced to the unsynchronized state
(synchronization reset)
After the reset is cleared, start writing from the data prior
to the establishment of synchronization, i.e. the data in
backward protection.
Initial value : SYR = 0
Caution :
1. To apply a synchronization reset, set SYR to 1 temporarily using CCB, and then set it back to 0 again using CCB.
The circuit will start synchronization capture operation at the point SYR is set to 0.
2. The SYR pin (pin30) also provides an identical reset control operation. Applications can use either method.
However, the control method that is not used must be set to 0 at all times.
Any pulse with a width of over 250 ns will suffice.
3. A reset must be applied immediately after the reception channel is changed.
If a reset is not applied, reception data from the previous channel may remain in on-chip memory.
4. Data read out after a synchronization reset is read out starting with the backward protection block data preceding
the establishment of synchronization.
(4) RAM write control (1bit) : OWE
OWE
RAM write conditions
0
Only data for which synchronization had been established is written.
1
Data for which synchronization not has been established (unsynchronized data) is also
written. (However, this applies when SYR = 0.)
Initial value : OWE = 0
(5) Error correction method setting (5bits) : EC0 to EC4
Initial values : EC0 = 0, EC1 = 1, EC2 = 0, EC3 = 0, EC4 = 1
Caution : 1. If soft-decision A or soft-decision B is specified, soft-decision control will be performed even if the number
of bits corrected is set to 0 (error detection only). With these settings, data will be output for blocks with no errors.
2. As opposed to soft-decision B, the soft-decision A setting suppresses soft decision error correction.
E
C
0
E
C
1
E
C
2
Number of bits corrected
0
0
0
0 (error detection only)
1
0
0
1 or fewer bits
0
1
0
2 or fewer bits
1
1
0
3 or fewer bits
0
0
1
4 or fewer bits
1
0
1
5 or fewer bits
0
1
1
Illegal value
1
1
1
Illegal value
E
C
3
E
C
4
Soft-decision setting
00
MODE0 Hard decision
10
MODE1 Soft decision A
01
MODE2 Soft decision B
1
1
Illegal value


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