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PDF M64403FP Data sheet ( Hoja de datos )
| Número de pieza | M64403FP | |
| Descripción | ERROR CORRECTION WITH VARIABLE LENGTH AND DISTANCE | |
| Fabricantes | Mitsubishi | |
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PRELIMINARYNSootmicee:pTahrisamisentroict alimfinitaslasrpeescuifbicjaetciot nto. change.
MITSUBISHI ICs (LSI)
M64403FP
ERROR CORRECTION WITH VARIABLE LENGTH AND DISTANCE
DESCRIPTION
The M64403FP performs the decoding for RS (Reed Solomon)
code which primitive polynomial:P (X)=X8+X4+X3+X2+1 and its
d-2
generation polynomial:G (X)=Π (X-αj).
j=0
M64403FP can set the code length and check byte length, so it is
able to be adopted to various systems.
FEATURES
It adopts three stages pipe line operation (Syndrome stage,
Euclidean stage, Chen search & error value stage), so it realizes
high speed error correction operation.
Capable of erasure correcting function and it improves error
correction performance.
• Where error counts (e), erasure counts (ε) and design distance
(d) have followed restriction.
2e + ε < d
Capable of parameter register programing.
(1) Four kinds of code parameter which code length and check
byte length are programmable.
(Good for the product code that has plural code parameters.)
• Where, maximum code length (L) are 255 bytes and
maximum check byte length (d-1) are 16 bytes.
(2) Programmable for erasure threshold.
(3) Programmable for four kinds of decoding mode.
APPLICATION
DVD player, DVD-ROM (DVD:Digital Video Disc), DBS (Direct
Broadcasting by Satellite), High density floppy disk, Hard disk,
CATV (Cable TV), MD (Mini Disc), DVC (Digital Video Cassette),
DAT (Digital Audio Cassette), DCC (DIgital Compact Cassette),
DVB (Digital Video Broadcast), CD-DA (Compact Disc-Digital
Audio), CD-ROM (Compact Disc-Read Only Memory), other
communication systems and storage media etc.
PIN CONFIGURATION (TOP VIEW)
ELO1 81
ELO2 82
ELO3 83
ELO4 84
ELO5 85
ELO6 86
ELO7 87
VSSO 88
DAM0 89
DAM1 90
DAM2 91
DAM3 92
DAM4 93
DAM5 94
DAM6 95
DAM7 96
VDDO 97
OTRG 98
EREN 99
ADDC 100
M64403FP
Outline 100P6S-C
50 CRDF
49 CORF
48 TES2
47 ERAF
46 TES7
45 VDDO
44 OMD0
43 OMD1
42 OMD2
41 CLKM
40 VSSO
39 RES
38 VDDO
37 ARM0
36 ARM1
35 ARM2
34 ARM3
33 DAI0
32 DAI1
31 DAI2
1 page  
PRELIMINARYNSootmicee:pTahrisamisentroict alimfinitaslasrpeescuifbicjaetciot nto. change.
MITSUBISHI ICs (LSI)
M64403FP
ERROR CORRECTION WITH VARIABLE LENGTH AND DISTANCE
DECODE MODE SETTING METHOD
Decode mode is able to set at IRDY=H. Decode mode table is as
follows. Decode mode should be changed after all operations that
are set before changing.
Decode mode table
MOD0
0
1
0
1
0
1
0
1
MOD1
0
0
1
1
0
0
1
1
MOD2
0
0
0
0
1
1
1
1
mode
code (0) error correction
code (1) error correction
code (2) error correction
code (3) error correction
code (0) erasure correction
code (1) erasure correction
code (2) erasure correction
code (3) erasure correction
CODE WORD INPUT METHOD
Code word is able to input at IRDY=H. IRDY changes H to L when
head symbol for code word is input. And IRDY changes L to H
when the last symbol of code word is input.
DHEF should be H and DIEN should be L when the head symbol
of code word is input. DIEN is input enable signal for code word
and while it's L, input data is recognized as valid data and latched
to the internal circuit at rising edge of CLKI.
If the syndrome calculation for the 2nd code word finishes while the
1st code word is executed at Euclidean calculation stage, the
syndrome data that is latched internally is overwritten (called
syndrome collision) and the correcting operation for the 1st code
word is impossible. In this case, SYCR changes to H and informs
external of its status. (If the last symbol of code word is input at
SBFB=H, decoding is operated safely.)
SYCR which changes to H is reset by system reset (REST=L).
ERASURE FLAG INPUT METHOD AND
ERASURE CORRECTION MODE
Erasure correcting mode is set by the setting of erasure threshold
to address 8 to B for parameter register and the setting of
MOD2=H for decode mode signal. Erasure flag (EREN) should
input H by synchronization with symbol data of code word.
Follows are about erasure threshold.
(1) Constrained error correction mode is derived when the bit0 (D0)
of the parameter register address-E is set to L.
If the input erasure count is over the erasure threshold value(∗3),
the operation is adopted ordinary error correction mode by
force.
(2) Erasure correction priority mode is derived when the bit0 (D0)
of the parameter register address-E is set to H.
If the error is detected at syndrome calculation and erasure
count is over the erasure threshold value(∗4,) M64403FP regards
its operation as uncorrectable and correcting operation doesn't
execute.
In any cases ((∗3),(∗4)), EROV (erasure over flag) changes to H.
5 Page 
PRELIMINARYNSootmicee:pTahrisamisentroict alimfinitaslasrpeescuifbicjaetciot nto. change.
MITSUBISHI ICs (LSI)
M64403FP
ERROR CORRECTION WITH VARIABLE LENGTH AND DISTANCE
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet M64403FP.PDF ] | |
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