Yamaha RX-V990, Service Manual

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RX-V990
IC7: YSS223
Digital Dolby Pro Logic Decoder with Auto Input Balance
No.
Name
110 Function
22
AO
0
-
23
A1
0
24
A2
0
25
A3
0
26 A4
0
External data RAM address terminal
27
A5
0
28
A6
0
29
A7
0
30
A12
0
31
A14
0
-
32
DVDD
-
] +5V power supply (digital section)
33
DVDD
-
34
/WE
0 External delay RAM write enable terminal
35
A13
0
] E~'mal d,'ay RAMadd"" ",mioal
36
A8
0
37
A9
0
38
A11
0
39
fOE
0 External delay RAM output enable terminal
40
A10
0 External delay RAM address terminal
41
ICE
0 External delay RAM chip enable terminal
42
D7
1/0t
1
E>rt,mald'~y RAMdata"'mioal
43
D6
I/Ot
44
D5
1/0t
45
D4
I/Ot
46
D3
1/0t
47
SYNCO
0 External
ND
converter word clock terminal
48
256FS
0
External
ND
converter 256fs clock terminal
49
ADD
It External
ND
converter data input terminal
50
64FS
0
External
ND
converter 64fs clock terminal
51
XO
0
] Crystal oscillator connecting terminal
52
XI
I
53
DGND
- Ground (digital section)
54
AVDD
A- +5V power supply (Analog section)
55
FR
AO FR channel D/A input
56
FL
AO FL channel D/A output
57
CHL
A- L1NS input
Sample/hold
Capacitor external terminal
58
L1NS
AI
L channel
ND
input
59
RINS
AI
R channel
ND
input
60
CHR
A- RINS input Sample/hold
Capacitor external terminal
61
RL
AO
RL channel
D/A output
62
RR
AO RR channel D/A input
63
CV
AO
ND,
multiplying DAC center voltage
64
AGND
A- Ground (Analog section)
Note:
Letters used in the above I/O column represent as follows.
I : Input terminal 0 : Output terminal t : TTL level C : CMOS level
S : Schmidt input A: Analog
15