參數(shù)資料
型號(hào)： LC78620E
廠商： Sanyo Electric Co.,Ltd.
英文描述： Compact Disc Player DSP(CD播放器DSP)
中文描述： 光碟機(jī)的DSP（數(shù)字信號(hào)處理器的CD播放器）
文件頁(yè)數(shù)： 29/34頁(yè)
文件大?。?/td> 477K
代理商： LC78620E
The DEMO pin can be used when the LC78620E is used in combination with an LA9210M or LA9211M.
By setting this pin high, muting can be set to 0 dB, the disk motor can be set to CLV, and a focus start operation can
be performed, even without issuing any commands from the control microprocessor. Also, since the LASER pin
becomes active, if the mechanism and servo systems are complete, an EFM signal can be acquired with only this
equipment, and an audio signal can be produced without the presence of a microprocessor. However, since the digital
attenuation is set to 100H, this technique is not appropriate for evaluating audio quality.
28. Other Pins; Pin 2:TAI, pin 80: TEST1, pin 12: TEST2, pin 26: TEST3, pin 31: TEST4, pin 74: TEST5, pin 40:
ASDFIR
These pins are used for testing the LSI’s internal circuits. Since the pins TAI and TEST1 to TEST5 have built-in
pull-down resistors, they can be left open in normal operation. ASDFIR must be connected to ground in normal
operation.
29. Circuit Block Operating Descriptions
RAM address control
The LC78620E 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 LC78620E 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 LC78620E 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.
No. 5130-29/34
LC78620E
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
相關(guān)PDF資料
PDF描述
LC78621E Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78622E Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78622NE Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78624E Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78625E SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC78621E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78622E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78622NE 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78624E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78625 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
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