NAD T 761 - S-Video;Video & Key Board IC Block Diagrams

S-VIDEO & 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
Signal
Control
AFC
Circuit
Sync
Separator
8-bit Latch
and
Command
decoder
Horizontal
Character
Size Register
Horizontal
Display
Position
Register
Ver tical
Display
Position
Register
Horizontal
Display
Position
Detection
Ver tical
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
Dispaly
RAM
Decoder
Decoder
Font
RAM
Shift Register
Ver tical
Character
Size Register
Horizontal
Size
Counter
Ver tical
Size
Counter
Horizontal
Dot
Counter
Ver tical
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
50