M64403FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
Número de pieza
componentes Descripción
Fabricante
M64403FP Datasheet PDF : 17 Pages
| |||
PRELIMINARY NSootmicee:pTahrisamisentroict alimfinitaslasrpeescuifbicjaetciot nto. change.
MITSUBISHI ICs (LSI)
M64403FP
ERROR CORRECTION WITH VARIABLE LENGTH AND DISTANCE
ERROR CORRECTION TIME
M64403FP is able to perform consecutive error correction
operation by bellowed three stage pipeline architecture.
• 1st stage...............Syndrome calculation
(operation step:A1=code length+20)
• 2nd stage............. Euclidean calculation
(operation step:A2=See table.2)
• 3rd stage.............. Chen search & error value calculation
(operation step:A1=code length+20)
Table. 1
1st code
2nd code
3rd code
4th code
pipe1
1st stage
pipe2
2nd stage
1st stage
pipe3
3rd stage
2nd stage
1st stage
Table. 1 shows the operation flow in pipe line. As for the 1st code,
M64403FP output error correction data at pipe4 after 1st stage is
operated at pipe1, 2nd stage is operated at pipe2 and 3rd stage is
operated at pipe3. Therefore, the error correction has a latency of
three stages. The maximum step count for each pipe means the
maximum steps among above mentioned 1st stage to 3rd stage.
Where, the design distance decides the step count at the 2nd
stage. (See Table. 2)
pipe4
correction
3rd stage
2nd stage
1st stage
pipe5
correction
3rd stage
2nd stage
pipe6
correction
3rd stage
pipe7
correction
(Ex.1) In the case of code length=100, design distance=11
A1=100+20=120, A2=160 A2>A1
So maximum operation step for one pipe is 160.
Therefore, correction data is obtained 480 steps (160 x
3) later from the input of 1st code word.
Table. 2
Design distance
Euclidean calculation steps
(erasure correction)
Euclidean calculation steps
(error correction)
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2
330 290 260 230 210 190 160 140 120 110 90 80 70 60 50 30
290 270 250 220 190 180 150 140 110 100 80 80 60 60 40 30
Share Link: 