Read Sony CDX-GT450U / CDX-GT457UE / CDX-GT500U / CDX-GT500US / CDX-GT505U / CDX-GT50UMS Service Manual online
CDX-GT50UMS/GT450U/GT457UE/GT500U/GT500US/GT505U
26
• IC Pin Function Description
MAIN BOARD (2/3) IC501 R5F3650KBDZ99FA (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Description
1
LCD_SO
O
Serial data output for LCD driver
2
LCD_CLK
O
Serial clock signal output for LCD driver
3
NOSE_SW
I
Front panel detach detect signal input (Fixed at L in this set)
4
SIRCS
I
SIRCS signal input
5
UNISO
O
SONY BUS serial data output (Not used in this set)
6
UNISI
I
SONY BUS serial data input (Fixed at L in this set)
7
UNISCK
O
SONY BUS serial clock signal output (Fixed at L in this set)
8
BYTE
I
External data bus width select signal input (Connect to VSS in this set)
9
CNVSS
I
Flash writer IF (CNVSS) signal input (L: normally operation, H: fl ash write)
10
XIN
I
Low speed operation clock signal input (32.768 kHz)
11
XOUT
O
Low speed operation clock signal output (32.768 kHz)
12
RESET
I
System reset signal input
13
OSCOUT
O
High speed operation clock signal output (7.92 MHz)
14
VSS
—
Ground
15
OSCIN
I
High speed operation clock signal input (7.92 MHz)
16
VCC1
—
Power supply pin (+3.3 V)
17
NMI
I
Non-maskable interrupt signal input (Fixed at H in this set)
18
RC_IN1
I
Rotary commander shift key signal input
19
BUIN
I
Backup power supply detect signal input
20
SYSRST
O
System reset signal output
21
BUS_ON
O
VBUS power control signal output (Not used in this set)
22
MC_RX
I
MC-BUS communication MECHA (CMX-101Z) TX signal input
23
NCO
O
Not used. (Open)
24
MC_TX
O
MC-BUS communication MECHA (CMX-101Z) RX signal output
25
NCO
O
Not used. (Open)
26
SYNC_OUT
O
DD converter frequency control signal output
27
NCO
O
Not used. (Open)
28
BEEP
O
Beep signal output for the power amplifi er IC
29
I2C_SCK
O
IIC communication serial clock signal output
30
I2C_SIO
I/O
IIC communication serial data input/output
31
FW_TXD
O
Flash writer IF (serial data) output
32
FW_RXD
I
Flash writer IF (serial data) input
33
FW_CLK
I
Flash writer IF (serial clock) signal input
34
FW_BUSY
O
Flash writer IF (busy) signal output
35, 36
NCO
O
Not used. (Open)
37
CD_ON
I
CD mechanism servo power supply control request signal input
38
CDM_ON
I
CD mechanism deck power supply control request signal input
39
WAKE_UP
O
CD mechanism deck micon wake up signal output
40
Z_MUTE
I
Z mute signal input
41
EPM
O
EPM signal output (Fixed at L in this set)
42
MODELNAME_SEL0
I
Model name select signal input 0 (Fixed at L in this set)
43
MODELNAME_SEL1
I
Model name select signal input 1 (Fixed at L in this set)
44
MODELNAME_SEL2
I
Model name select signal input 2 (Fixed at L in this set)
45
MODELNAME_SEL3
I
Model name select signal input 3 (Fixed at L in this set)
46
CE
O
CE signal output (Fixed at H in this set)
47
NCO
O
Not used. (Open)
48
SA_DATAIN
I
Paradisso spectrum analyzer serial data input
49
SA_CLKOUT
O
Paradisso spectrum analyzer serial clock signal output
50
USBON
O
USB over current detect IC control signal output
51
VBUS_ON
I
VBUS power supply control signal input (L: VBUS OFF, H: VBUS ON)
52
USB_OVR
I
USB over current detect signal input
53
EXTATT_XEN
O
L is sent when electronic volume IC has the status of CD/USB (H is sent when it has the
status of other source) (Not used in this set)
status of other source) (Not used in this set)
54, 55
NCO
O
Not used. (Open)
56
TELATT
I
Telephone attenuator detect signal input (AEP, UK, Russian model)
57
ACC_IN
I
Accessory power supply detect signal input
58
ATT
O
Audio mute control signal output
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