參數(shù)資料
型號(hào)： SAA7378GP
廠商： NXP Semiconductors N.V.
英文描述： Single Chip Digital Servo Processor and Compact Disc Decoder
中文描述： 單片機(jī)數(shù)字伺服處理器和光盤(pán)解碼器
文件頁(yè)數(shù)： 17/45頁(yè)
文件大小： 224K
代理商： SAA7378GP
Philips Semiconductors
Preliminary specification: Version 1.0
May 1995
17
Digital Servo Processor and Compact Disc Decoder (CD7)
SAA7378GP
7.11
The SAA7378 has five pins that can be reconfigured for different applications:
The VIA Interface
7.12
Spindle Motor Control
7.12.1
The spindle motor speed is controlled by a fully integrated digital servo. Address information from the internal
±
8 frame
FIFO and Disc speed information are used to calculate the motor control output signals. Several output modes, selected by
register 6, are supported:
-
Pulse Density, 2-line (true complement output), 1MHz sample frequency.
-
PWM-output, 2-line, 22.05kHz modulation frequency.
-
PWM-output, 4-line, 22.05kHz modulation frequency.
-
CDV motor mode.
Motor Output Modes
7.12.1.1
In the Pulse Density mode the motor output pin, MOTO1, is the pulse density modulated motor output signal. 50% duty cycle
corresponds with the motor not actuated, higher duty cycles mean acceleration, lower mean braking. In this mode, the
MOTO2 signal is the inverse of the MOTO1 signal. Both signals change state only on the edges of a 1MHz internal clock
signal. Possible application diagrams are shown in Figure 10.
Pulse Density Output Mode
7.12.1.2
In the PWM mode the motor acceleration signal is put in pulse-width modulation form on the MOTO1 output, and the motor
braking signal is pulse-width modulated on the MOTO2 output. Figure 11 shows the timing and Figure 12 a typical application
diagram.
PWM Output Mode, 2-Line
PIN NAME
PIN no.
TYPE
CONTROL
REGISTER
ADDRESS
CONTROL
REGISTER
DATA
FUNCTION
V1
62
Input
1100
xxx1
External offtrack signal input
xxx0
Internal offtrack signal used
Input may be read via decoder status bit;
selected via register 2.
V2
63
Input
Input may be read via decoder status bit;
selected via register 2.
V3
42
Output
1100
xx0x
Kill output for Right channel
x01x
Output = 0
x11x
Output = 1
V4
41
Output
1101
0000
4-line motor drive (using V4 & V5)
xx10
Output = 0
xx11
Output = 1
V5
40
Output
1101
01xx
Deemphasis output (active high)
10xx
Output = 0
11xx
Output = 1
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