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參數(shù)資料
| 型號： | CXD2598Q |
| 廠商： | Sony Corporation |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | CD Digital Signal Processor with Built-in Digital Servo and DAC(數(shù)字式CD信號處理器（內(nèi)置數(shù)字式伺服系統(tǒng)和D/A轉(zhuǎn)換器）) |
| 中文描述： | CD數(shù)字信號處理器，具有內(nèi)置數(shù)字伺服和DAC（數(shù)字式光盤信號處理器（內(nèi)置數(shù)字式伺服系統(tǒng)和的D / A轉(zhuǎn)換器）） |
| 文件頁數(shù)： | 69/147頁 |
| 文件大?。?/td> | 1113K |
| 代理商： | CXD2598Q |
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CXD2598Q
§3. Description of Modes
This LSI has three basic operating modes using a combination of spindle control and the PLL. The operations
for each mode are described below.
§3-1. CLV-N Mode
This mode is compatible with the CXD2510Q, and operation is the same as for conventional control. The PLL
capture range is ±150kHz.
§3-2. CLV-W Mode
This is the wide capture range mode. This mode allows the conventional PLL to follow the rotational velocity of
the disc. This rotational following control has two types: using the built-in VCO2 or providing an external VCO.
The spindle is the same CLV servo as for the conventional series. Operation using the built-in VCO2 is
described below. (When using an external VCO, input the signal from the VPCO pin to the low-pass filter, use
the output from the low-pass filter as the control voltage for the external VCO, and input the oscillation output
from the VCO to the V16M pin.)
When starting to rotate the disc and/or speeding up to the lock range from the condition where the disc is
stopped, CAV-W mode should be used. Specifically, first send $E665X to set CAV-W mode and kick the disc,
then send $E60CX to set CLV-W mode if ALOCK is high. The microcomputer monitors the serial data output,
and must return the operation to the speed adjusting state (CAV-W mode) when ALOCK becomes low. The
control flow according to the microcomputer software is shown in Fig. 3-2.
In CLV-W mode (normal), low power consumption is achieved by setting LPWR to high. Control was formerly
performed by applying acceleration and deceleration pulses to the spindle motor. However, when LPWR is set
to high, deceleration pulses are not output, thereby achieving low power consumption mode.
Note)
The capture range for this mode is theoretically up to the signal processing limit.
§3-3. CAV-W Mode
This is CAV mode. In this mode, the external clock is fixed and it is possible to control the spindle to the
desired rotational velocity. The rotational velocity is determined by the VP0 to VP7 setting values or the
external PWM. When controlling the spindle with VP0 to VP7, setting CAV-W mode with the $E665X command
and controlling VP0 to VP7 with the $DX commands allows the rotational velocity to be varied from low speed
to quadruple speed. (See "$DX commands".) When controlling the spindle with the external PWM, the PWMI
pin is binary input which becomes KICK during high intervals and BRAKE during low intervals.
The microcomputer can know the rotational velocity using V16M. The reference for the velocity measurement
is a signal of 132.3kHz obtained by 1/128-frequency dividing XTAL (XTAI, XTAO) (384Fs). The velocity is
obtained by counting half of the V16M pulses while the reference is high, and the result is output from the new
CPU interface as 10 bits (VF0 to VP9). These measurement results are 31 when the disc is rotating at normal
speed or 127 when it is rotating at quadruple speed. These values match those of the 256 - n for control with
VP0 to VP7. (See Table 2-5 and Fig. 2-6.)
In CAV-W mode, the spindle is set to the desired rotational velocity and the operation speed for the entire
system follows this rotational velocity. Therefore, the cycles for the Fs system clock, PCM data and all other
output signals from this LSI change according to the rotational velocity of the disc.
Note)
The capture range for CAV-W mode is theoretically up to the signal processing limit.
Note)
Set FLFC to 1 for this mode.
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