Read Sony CDX-GT828U / CDX-GT870US / CDX-GT878US Service Manual online
CDX-GT828U/GT870US/GT878US
36
KEY BOARD IC901 M30876FJBA04GP (FL DRIVER, LED CONTROL, FLASH MEMORY CONTROL)
Pin No.
Pin Name
I/O
Description
1
SYS_CE
I
Main chip enable signal input
2
NC
O
Not used. (Open)
3
FL_DATA3
O
FL serial data signal output 3
4
NC
O
Not used. (Open)
5
FL_CLK_IN
I
FL serial clock signal input
6
BYTE
I
Connect to VSS. (Fixed at L)
7
CNVSS
I
Flash writer signal input (L: normally operation, H: writer mode)
8, 9
NC
O
Not used. (Open)
10
RESET
I
Reset signal input
11
XOUT
O
Main-clock signal output (6.75 MHz)
12
VSS
―
Ground
13
XIN
I
Main-clock signal input (6.75 MHz)
14
VCC1
―
Power supply pin (+3.3 V)
15
NMI
I
Nonmaskable interruption signal input (Fixed at H)
16 to 18
NC
O
Not used. (Open)
19
GCP_TA4_IN
I
FL GCP signal input
20, 21
NC
O
Not used. (Open)
22
BK_TA3_OUT
O
FL BK signal output
23
NC
O
Not used. (Open)
24
LAT_TA2_OUT
O
FL latch signal output
25
LAUNG
I
Foreign language font display mode with/without setting signal input (L: without foreign
language font display mode (CDX-GT828U/GT870US), H: with foreign language font display
mode (CDX-GT878US))
language font display mode (CDX-GT828U/GT870US), H: with foreign language font display
mode (CDX-GT878US))
26
BLINK
O
Blink control signal output
27
NC
O
Not used. (Open)
28
GCP_TA0_OUT
O
FL GCP signal output
29
SYS_SO
O
Serial data signal output
30
SYS_SI
I
Serial data signal input
31
SYS_CLK
I
Serial clock signal input
32
NC
O
Not used. (Open)
33
FL_DATA1
O
FL serial data signal output 1
34
NC
O
Not used. (Open)
35
FL_CLK
I
FL serial clock signal input
36
NC
O
Not used. (Open)
37
RDY
I
External data bus (RDY) signal input (Fixed at H) (CDX-GT878US only)
38
ALE
O
Not used. (Open)
39
HOLD
I
External data bus (HOLD) signal input (L: CDX-GT828U/GT870US, H: CDX-GT878US)
40
HLAD
O
Not used. (Open)
41
BCLK
O
Not used. (Open)
42
RD
O
External data bus (RD) signal output (CDX-GT878US only)
43
WRH/BHE
O
Not used. (Open)
44
WRL/WR
I
External data bus (WRL/WR) signal input (L: CDX-GT828U/GT870US, H: CDX-GT878US)
45
CS3
O
Not used. (Open)
46
CS2
O
Not used. (Open)
47
CE
O
External data bus (CE) signal output (CDX-GT878US only)
48
A19
I/O
External data bus (A19) signal input/output (CDX-GT878US only)
49
A18
I/O
External data bus (A18) signal input/output (CDX-GT878US only)
50
A17
I/O
External data bus (A17) signal input/output (CDX-GT878US only)
51
A16
I/O
External data bus (A16) signal input/output (CDX-GT878US only)
52
A15
I/O
External data bus (A15) signal input/output (CDX-GT878US only)
53
A14
I/O
External data bus (A14) signal input/output (CDX-GT878US only)
54
A13
I/O
External data bus (A13) signal input/output (CDX-GT878US only)
55
A12
I/O
External data bus (A12) signal input/output (CDX-GT878US only)
56
A11
I/O
External data bus (A11) signal input/output (CDX-GT878US only)
57
A10
I/O
External data bus (A10) signal input/output (CDX-GT878US only)
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