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參數資料
| 型號： | LC78624E |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Compact Disc Player DSP(用于CD播放器的8位DSP) |
| 中文描述： | 光碟機的DSP（用于光盤播放器的8位數字信號處理器） |
| 文件頁數： | 24/27頁 |
| 文件大小： | 357K |
| 代理商： | LC78624E |
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24. Circuit Block Operating Descriptions
RAM address control
The LC78624E incorporates an 8-bit
×
2k-word RAM on chip. This RAM has an EFM demodulated data jitter handling
capacity of ±4 frames implemented using address control. The LC78624E continuously checks the remaining buffer
capacity and controls the data write address to fall in the center of the buffer capacity by making fine adjustments to the
frequency divisor in the PCK side of the CLV servo circuit. If the ±4 frame buffer capacity is exceeded, the LC78624E
forcibly sets the write address to the ±0 position. However, since the errors that occur due to this operation cannot be
handled with error flag processing, the IC applies muting to the output for a 128 frame period.
C1 and C2 Error Correction
The LC78624E writes EFM demodulated data to internal RAM to compensate for jitter and then performs the
following processing with uniform timing based on the crystal oscillator clock. First, the LC78624E performs C1
error checking and correction in the C1 block, determines the C1 flags, and writes data to the C1 flag register. Next,
the LC78624E performs C2 error checking and correction in the C2 block, determines the C2 flags, and writes data
to internal RAM.
Note: 1. If the positions of the errors determined by the C2 check agree with the C1 flags, the correction is performed and the flags are cleared.
However, if the number of C1 flags is 7 or higher, C2 correction may fail. In this case correction is not performed and the C1 flags are taken as
the C2 flags without change. Error correction is not possible if one error position agrees and the other does not. Furthermore, if the number of
C1 flags is 5 or under, the C1 check result can be seen as unreliable. Accordingly, the flags will be set in this case. Cases where the number of
C1 flags is 6 or more are handled in the same way, and the C1 flags are taken as the C2 flags without change. When there is not even one
agreement between the error positions, error correction is, of course, impossible. Here, if the number of C1 flags was 2 or under, data that was
seen as correct after C1 correction is now seen as incorrect data. The flags are set in this case. In other cases, the C1 flags are taken as the
C2 flags without change.
2. When data is determined to have three or more errors and be uncorrectable, correction is, of course, impossible. Here, if the number of C1
flags was 2 or under, data that was seen as correct after C1 correction is now seen as incorrect data. The flags are set in this case. In other
cases the C1 flags are taken as the C2 flags without change
No. 5811-24/27
LC78624E
Position
Division ratio or processing
–4 or less
Force to ±0
–3
589
–2
589
Increase ratio
–1
589
±0
588
Standard ratio
+1
587
+2
587
Decrease ratio
+3
587
+4 or more
Force to ±0
C1 flag
Error correction and flag processing
No errors
No correction required · Flag reset
1 error
Correction · Flag reset
2 errors
Correction · Flag set
3 errors or more
Correction not possible · Flag set
C2 flag
Error correction and flag processing
No errors
No correction required · Flag reset
1 error
Correction · Flag reset
2 errors
Depends on C1 flags
*
1
3 errors or more
Depends on C1 flags
*
2
相關PDF資料 |
PDF描述 |
|---|---|
| LC78625E | SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs |
| LC78625 | SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs |
| LC78626KE | Compact Disc Player DSP(用于CD播放器的8位DSP) |
| LC78626 | 16-bit fixed point DSP with Flash |
| LC78626E | 16-bit fixed point DSP with Flash |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LC78625 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP |
| LC78625E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP |
| LC78626 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DSP for Compact Disk Players |
| LC78626E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DSP for Compact Disk Players |
| LC78626KE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CD-Player Processor/Controller |
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