LG MG200 Service Manual page 41

Table of Contents

Advertisement

3. H/W CIRCUIT DESCRIPTION
MIDI sound circuit description
1 (
3
M
H
, z
C
M
L
C
M
E
( D
: 0
) 7
The YMU762 has features as described below.
• Simultaneous generation of up to 40 tones :
• Polyphonic synthesizer specification
• Has built-in default tones for FM and Waveform table synthesizers in the ROM, and the tones can
be downloaded to RAM.
• Stream replay with ADPCM/PCM
• Software interrupt mechanism for external synchronization
• Equipped with 8 bit parallel I/F for control from CPU
• Equipped with speaker amplifier and equalizer circuit
• Has built-in PLL to support inputting of master clock up to 20 MHz.
• Contains a 16-bit stereophonic D/A converter.
Y
1
O
) S
M
C
L
K
C
L
K
1
4
D
_
R
E
S
E
T
_
R
S
T
3
0
( A
) 1
A
0
3
1
_
R
D
_
R
D
2
9
M
D I
_ I
C
S
_
C
S
5
N
C
2
8
_
W
R
_
W
R
3
L
O
D
Y
_
N I
T
_
R I
Q
2
7
( D
) 0
D
0
2
6
( D
) 1
D
1
2
5
( D
) 2
D
2
2
4
( D
) 3
D
3
2
3
( D
) 4
D
4
2
2
( D
) 5
D
5
2
1
( D
) 6
D
6
2
0
( D
) 7
D
7
2
V
8
5
_
C
A
M
R
2
1
4
3
3 .
K
P
L
L
C
6
V
R
E
F
9
O I
V
D
3
2
V
D
D
7
V
S
S
8
C
2
0
1
C
2
0
0
C
2
2
3
0
1 .
u
1
u
0
1 .
u
Figure 24. MIDI sound Circuit
- 40 -
U
2
0
1
M
U
7
6
2
1
1
H
P
O
U
T
_
R
1
0
H
P
O
U
T
_
L
C
2
0
4
R
2
0
3
1
2
E
Q
1
0
0 .
2
2
u
3
3
K
1
3
E
Q
2
C
2
0
9
1
2
0
p
R
2
0
7
6
8
K
1
4
E
Q
3
2
L
E
D
1
9
M
T
R
1
7
S
P
O
U
T
1
1
8
S
P
O
U
T
2
S
P
V
D
D
1
5
D
1
6
S
P
V
S
S
C
2
0
6
R
2
0
5
O
K
_ I
M
X I
_
N I
1
u
3
3
K
V
B I
R
A
T
O
R
S
P
K
P
_
O
I K
S
P
K
N
_
O
I K
V
B
A
T
C
2
2
1
C
2
2
2
0
1 .
u
2
2 .
u

Advertisement

Table of Contents
loading

Table of Contents