參數(shù)資料
型號(hào)： LC78626
廠商： Sanyo Electric Co.,Ltd.
元件分類： 數(shù)字信號(hào)處理
英文描述： 16-bit fixed point DSP with Flash
中文描述： 具有閃存的 16 位定點(diǎn) DSP
文件頁(yè)數(shù)： 14/32頁(yè)
文件大?。?/td> 475K
代理商： LC78626
6
The CLV Servo Circuit
Pin 20: CLV+, Pin 21: CLV-, Pin 22: V/P
CLV
+
is the signal for accelerating the disk in the forward direction, while CLV
–
is the signal for decelerating the
disk. Depending on the commands from the microcontroller, one of the following four modes is selected: Accelerate,
decelerate, CLV, or stop. The CLV
+
and CLV
–
outputs for each mode are as shown in the table below.
* The CLV servo control command is such that the TOFF pin is low only when the CLV mode is in effect, and it is high
otherwise. The TOFF pin control by the command is only active when the CLV mode is in effect.
(1) The CLV Mode
In the CLV mode the rotation of the disk is detected from the HF signal, and a precise linear speed of rotation is
derived by exerting the respective forms on control when the internal modes of the DSP change. The PWM frequency
is 7.35 kHz. The V/P has a high output when the internal mode is the rough servo, and a low output when the internal
mode is phase control.
(2) Switching the Rough Servo Gain
When the internal mode is the rough servo, the CLV control gain for the 8 cm disk can be reduced by 8.5 dB from the
level for the 12 cm disk.
No. 5692-14/32
LC78626E
Code
COMMAND
RES = low
$04
DISC MOTOR START (Accelerate)
$05
DISC MOTOR CLV (CLV)
$06
DISC MOTOR BRAKE (Decelerate)
$07
DISC MOTOR STOP (Stop)
G
G
MODE
CLV
+
CLV
–
Accelerate
high
low
Decelerate
low
high
CLV
Pulse output
Pulse output
Stop
low
low
Internal mode
CLV
+
CLV
–
V/P
Rough servo (when the rotational speed is determined to be low)
high
low
high
Rough servo (when the rotational speed is determined to be high)
low
high
high
Phase control (when the PCK clock is running)
PWM
PWM
low
Code
COMMAND
RES = low
$A8
DISC 8 cm Set
$A9
DISC 12 cm Set
G
G
相關(guān)PDF資料
PDF描述
LC78626E 16-bit fixed point DSP with Flash
LC78628 16-bit fixed point DSP with Flash
LC78628E 16-bit fixed point DSP with Flash
LC78630 16-bit fixed point DSP with Flash
LC78630E 16-bit fixed point DSP with Flash
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
LC78628 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP with Built-in HDCD Decoder
LC78628E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP with Built-in HDCD Decoder
LC7863 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS
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