SAA7374GP PHILIPS [NXP Semiconductors], SAA7374GP Datasheet - Page 20

• Manufacturer Part Number: SAA7374GP
• Description: Low voltage digital servo processor and Compact Disc decoder CD7LV
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
7.12
The SAA7374 has five pins that can be reconfigured for different applications (see Table 8).
Table 8 Pin applications
7.13
7.13.1
The spindle motor speed is controlled by a fully integrated
digital servo. Address information from the internal
calculate the motor control output signals. Several output
modes, selected by register 6, are supported:
1998 Feb 26
PIN NAME
8 frame FIFO and disc speed information are used to
Pulse density, 2-line (true complement output),
(1
PWM output, 2-line, (22.05
frequency
PWM output, 4-line, (22.05
frequency
CDV motor mode.
Low voltage digital servo processor and
Compact Disc decoder (CD7LV)
V1
V2
V3
V4
V5
n) MHz sample frequency
The VIA interface
Spindle motor control
M
OTOR OUTPUT MODES
NUMBER
PIN
62
63
42
41
40
output
output
output
TYPE
n) kHz modulation
n) kHz modulation
input
input
REGISTER
CONTROL
ADDRESS
1100
1100
1101
1101
REGISTER
CONTROL
20
DATA
0000
x01x
xx01
xx10
01xx
10xx
xxx1
xxx0
xx0x
x11x
xx11
11xx
7.13.1.1
In the pulse density mode the motor output pin (MOTO1)
is the pulse density modulated motor output signal. A 50%
duty factor corresponds with the motor not actuated,
higher duty factors 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 (1
application diagrams are illustrated in Fig.13.
7.13.1.2
In the PWM mode the motor acceleration signal is put in
pulse-width modulation form on the MOTO1 output. The
motor braking signal is pulse-width modulated on the
MOTO2 output. The timing is illustrated in Fig.14. A typical
application diagram is illustrated in Fig.15.
Q-to-W subcode output
output = 0
output = 1
de-emphasis output (active HIGH)
output = 0
output = 1
external off-track signal input
internal off-track signal used, input may be read
via decoder status bit; selected via register 2
input may be read via decoder status bit;
selected via register 2
KILL output for right channel
output = 0
output = 1
4-line motor drive (using V4 and V5)
Pulse density output mode
PWM output mode (2-line)
n) MHz internal clock signal. Possible
FUNCTION
Product specification
SAA7374