Yamaha RX-V750 Service Manual page 60

RX-V750/DSP-AX750/DSP-AX750SE
RX-V650/HTR-5760
IC606 : LC74781-9798 (FUNCTION P.C.B.)
On-screen Display Controller
VSS1
XTAL IN
XTAL OUT
CTRL1
BLANK
OSC IN
OSC OUT
CHARA
CS
SCLK
SIN
VDD2
CS
SERIAL
8 BIT
LATCH
SIN
+
COMMAND
PARALLEL
DECODER
CONVERSION
SCLK
HORIZONTAL
DIRECTION
CHARACTER SIZE
REGISTER
RST
HORIZONTAL
SIZE COUNTER
VDD1
VSS1
VDD2
CHARA
SYNCHRONOUS
DISTINCTION
CHARACTER
OSC IN
OUTPUT
DOT CLOCK
OSC OUT
GENERATOR
SYN IN
COMPLEX
SYNCHRONOUS
SYNCHRONOUS
SEP C SIGNAL
SEPARATION
SEPARATION
CONTROL
SEP OUT
SEP IN
CTRL3
60
1 24 VDD1
2 23 RST
3 22 CTRL3
4 21 CTRL2
5 20 SEP IN
6 19 SEP OUT
7 18 SEPC
8 17 SYN IN
9 16 VDD1
10 15 CV IN
11 14 NC
12 13
CV OUT
HORIZONTAL VERTICAL FLASHING &
DISPLAY
VERTICAL DIRECTION
DISPLAY
DISPLAY CONVERSION
CHARACTER SIZE CONTROL
POSITION POSITION CONTROL
REGISTER REGISTER
REGISTER REGISTER REGISTER
FLASHING &
VERTICAL HORIZONTAL VERTICAL
CONVERSION
SIZE COUNTER DOT COUNTER DOT COUNTER
CONTROL
CIRCUIT
HORIZONTAL VERTICAL
DISPLAY POSITION DISPLAY POSITION
DETECTION DETECTION
CHARACTER LINE
CONTROL CONTROL
COUNTER COUNTER
SYNCHRONOUS CHARACTER OUTPUT CONTROL
TIMING
SIGNAL BACKGROUND CONTROL
GENERATOR
GENERATOR VIDEO OUTPUT CONTROL
CTRL XTAL BLANK CV
CTRL XTAL
2 IN IN OUT
1 OUT
IC606 : LC74781-9798 (FUNCTION P.C.B.)
On-screen Display Controller
Pin No. Symbol
1 VSS1
2 XTAL IN
3 XTAL OUT
4 CTRL1
5 BLANK
6 OSC IN
7 OSC OUT
8 CHARA
9 /CS
10 SCLK
11 SIN
12 VDD2
13 CV OUT
14 NC
RAM 15 CV IN
WRITE
ADDRESS
16 VDD1
COUNTER
17 SYN IN
DISPLAY
DECODER
RAM
18 SEP C
19 SEP OUT
20 SEP IN
DECODER
21 CTRL2
FONT ROM
SHIFT
REGISTER
22 CTRL3
23 /RST
CV
24 VDD1
Terminal name
Ground terminal Connection to GND (Digital system ground terminal)
Crystal oscillation Terminal to connect the crystal of the crystal oscillator for internal synchronous
terminal signal generation and a capacitor or to input an external clock. (2fsc or 4fsc)
Crystal oscillation input Switching terminal between the mode to input a clock externally and the mode
switching terminal for crystal oscillation. [L] = Crystal oscillation, [H] = External clock input
Blank output terminal Terminal to output the blank signal (character and bordering OR signal) (MOD0 :
complex synchronous signal output at [H]). When resetting (RST terminal = [L]),
a crystal oscillation clock is output (but not when resetting by the command).
LC oscillation terminal Terminal to connect the coil of the oscillator for character output dot clock
generation and a capacitor.
Character output terminal Terminal to output a character signal (MOD0 : It becomes an output terminal to
judge the external synchronous signal at [H] and outputs the result after judging
existence of the external synchronous signal. When a synchronous signal exists,
[H] is output.) When resetting (RST terminal = [L]), a dot clock (LC oscillation) is
output (but it is not output when reset by the command.)
Enable input terminal Serial data input enable input terminal. The serial data input becomes enable at
[L]. A pull-up resistor is built in (hysteresis input).
Clock input terminal Input terminal of clock for serial data input.
A pull-up resistor is built in (hysteresis input).
Data input terminal Serial data input terminal. A pull-up resistor is built in (hysteresis input).
Power supply terminal Power supply terminal for complex image signal level adjustment (Power supply
for analog system)
Video signal output terminal Output terminal for complex image signal.
Connected to GND or unconnected.
Video signal input terminal Input terminal for complex image signal.
Power supply terminal Power supply terminal (+5V : power supply for digital system)
Synchronous separation Video signal input terminal of the built-in synchronous separation circuit (When
circuit input terminal the built-in synchronous separation circuit is not used, it becomes a horizontal
synchronous signal input or a complex synchronous signal input.)
Synchronous separation Terminal to monitor built-in synchronous separation circuit bias voltage.
circuit bias voltage terminal
Complex synchronous Terminal to output a complex synchronous signal of built-in synchronous
signal output terminal separation circuit ([H] when internally synchronized at MOD1 : [H], [L] output
when externally synchronized) (When the built-in synchronous separation circuit
is not used, SYNIN input signal is output.)
Vertical synchronous Terminal to input a vertical synchronous signal by integrating the output signal of
signal input terminal SEPOUT terminal. Connect the integration circuit between SEPOUT terminals.
Fix it to VDD1 when not used.
NTSC/PAL-M switching Pin setting has a priority over switching of NTSC/PAL/PAL-M/PAL-N method.
input terminal The NTSC method is selected after [L]= reset.
NTSC/PAL/PAL-M/PAL-N method setting by a command is effective.
[H] = PAL-M method.
SEPIN input control terminal Terminal to control whether or not to input VSYNC signal into SEPIN input
terminal. [L] = VSYNC inputted, [H] = VSYNC not inputted.
Reset input terminal System reset input terminal. A pull-up resistor is built in (hysteresis input).
Power supply terminal (+5V) Power supply terminal (+5V : power supply for digital system)
Function