NAD T 751 - S-Video and Keyboard Board IC Block Diagrams; LC74763-9012, LC87 F65 C8 A Block Diagrams

44
S-VIDEO BOARD
U401: LC74763-9012
KEY BOARD
U201: LC87F65C8A
8CS
9SIN
10SCLK
15RST
11SECAM
12525/625
13NTSC/PAL
143.58/4.42
Serial
Parallel
Converter
Composite
Synchron-
ization
Singal
Control
AFC
Circuit
Sync
Separator
8-bit Latch
and
Command
decoder
Horizontal
Character
Size Register
Horizontal
Display
Position
Register
Vertical
Display
Position
Register
Horizontal
Display
Position
Detection
Vertical
Display
Position
Detection
Character
Control
Counter
Timing Generator
Sync
Separator
Horizontal
Display
Position
Detection
Synchronization
Signal Generator
Character Output Control
Background Control
Video Output Control
Line
Control
Counter
Flashing/
Reversal
Control
Register
Flashing/
Reversal
Control
Circuit
Display
Control
Register
RAM Write
Address
Counter
Display
RAM
Decoder
Decoder
Font
RAM
Shift Register
Vertical
Character
Size Register
Horizontal
Size
Counter
Vertical
Size
Counter
Horizontal
Dot
Counter
Vertical
Dot
Counter
30VDD1
17VDD2
22VSS
29SYNCDET
27VCOIN
28VCOOUT
26FC
20SYNIN
24AMPIN
25AMPOUT
23PDOUT
21SEPC
4
HSYNOUT
7
VSYNOUT
2
XTALIN1
3
XTALOUT1
19
CVCR
16
CVOUT
18
CVIN
5
XTALIN2
6
XTALOUT2
Interrupt Control
IR
Flash ROM
PC
ACC
B Register
C Register
PSW
RAR
RAM
Stack Pointer
Watch Dog Timer
ALU
PLA
Stand-by Control
CF
Clock
Generator
RC
X'tal
Bus Interface
Port 0S100 Port 1S101 Port 3Timer 0 Port 7Timer 1 Port 8Base Timer
ADCVFD Controller
Weak Signal Detector
INTO-3 Noise rejection Filter