JVC LT-52GZ79 Service Manual page 8

2.4.2 MAIN CPU PIN FUNCTION
Pin Pin name I/O
1 TCK O Test purpose
2 TMS I Test purpose
3 TDI I Test purpose
4 TDO O Test purpose
5 P2.8 I Input for HDMI CEC
6 P2.9 O Blue for OSD
7 P2.10 O Blue for OSD
8 P2.11 O Blue for OSD
9 P2.12 O Blue for OSD
10 P2.13 O Blue for OSD
11 P2.14 I Not used
12 P2.15 O Not used: Request for chassis CPU communication
13 VSS33 - GND
14 VDD33 I 3.3V
15 P4.5 O Not used
16 A20 O Program ROM address for main CPU
17 A19 O Program ROM address for main CPU
18 A18 O Program ROM address for main CPU
19 A17 O Program ROM address for main CPU
20 VSS25 - GND
21 VDD25 I 2.5V
22 A16 O Program ROM address for main CPU
23 A8 O Program ROM address for main CPU
24 A7 O Program ROM address for main CPU
25 A9 O Program ROM address for main CPU
26 A6 O Program ROM address for main CPU
27 A5 O Program ROM address for main CPU
28 A10 O Program ROM address for main CPU
29 A11 O Program ROM address for main CPU
30 A12 O Program ROM address for main CPU
31 VSS33 - GND
32 VDD33 I 3.3V
33 A4 O Program ROM address for main CPU
34 A3 O Program ROM address for main CPU
35 A2 O Program ROM address for main CPU
36 A1 O Program ROM address for main CPU
37 A0 O Program ROM address for main CPU
38 A13 O Program ROM address for main CPU
39 ARAS/A14 O Program ROM address for main CPU
40 CAS/A15 O Program ROM address for main CPU
41 VSS33 - GND
42 VDD33 I 3.3V
43 MEMCLK O Clock for memory
44 CSSDRAM O Chip select for memory
45 CLKEN O Clock enable for memory
46 CSROM O Chip select for memory
47 RD O Read for memory
48 UDQM O Control buffer of memory
49 LDQM O Control buffer of memory
50 WR O Write for memory
51 D15 I/O Program ROM data for main CPU
52 VSS33 - GND
53 VDD33 I 3.3V
54 D7 I/O Program ROM data for main CPU
55 D0 I/O Program ROM data for main CPU
56 D14 I/O Program ROM data for main CPU
57 D8 I/O Program ROM data for main CPU
58 D6 I/O Program ROM data for main CPU
59 D1 I/O Program ROM data for main CPU
60 VSS33 - GND
61 VDD33 I 3.3V
62 D13 I/O Program ROM data for main CPU
63 D9 I/O Program ROM data for main CPU
64 D5 I/O Program ROM data for main CPU
1-8 (No.YA665<Rev.001>)
[IC7301 : DIGITAL PWB]
Function Pin Pin name I/O
65 D2 I/O Program ROM data for main CPU
66 D12 I/O Program ROM data for main CPU
67 D10 I/O Program ROM data for main CPU
68 VSS33 - GND
69 VDD33 I 3.3V
70 D4 I/O Program ROM data for main CPU
71 D3 I/O Program ROM data for main CPU
72 D11 I/O Program ROM data for main CPU
73 RSTIN I Reset
74 POWER O Sleep state release for chassis CPU [Release : L]
75 P3.1 O Not used: Reset for digital tuner unit
76 REMOCON I Remote control
77 P3.3 I Clock for OSD
78 P3.4 O Red for OSD
79 P3.5 O Red for OSD
80 P3.6 O Red for OSD
81 P3.7 O Red for OSD
82 MTST I/O Data transmission for chassis CPU communication
83 MTSR I/O Data receive for chassis CPU communication
84 VSS33 - GND
85 VDD33 I 3.3V
86 VSS25 - GND
87 VDD25 I 2.5V
88 TXD0 I/O Not used: Data transmission for digital tuner unit
89 RXD0 I/O Not used: Data receive for digital tuner unit
90 P3.12 O Red for OSD
91 CLK O Clock for chassis CPU communication
92 P3.15 O Output for HDMI CEC
93 P5.14 O Green for OSD
94 P5.15 O Green for OSD
95 TRIG_IN O Green for OSD
96 TRIG_OUT O Green for OSD
97 P6.2 O Green for OSD
2
98 P6.3 I/O I C bus clock (for main memory)
2
99 P6.4 I/O I C bus Data (for main memory)
100 P6.5 O Sync signal select for OSD / Teletext
101 IRQ O Not used: Interrupt request for digital tuner unit
102 VSYNC I Vertical sync
103 HSYNC I Horizontal sync
104 COR/RSTOUT O Not used
105 BLANK O Ys for OSD / Teletext
106 VDD33 I 3.3V
107 VSS33 - GND
108 XTAL1 I 6MHz for system clock
109 XTAL2 O 6MHz for system clock
110 VSSA - GND
111 VDDA I 2.5V
112 R O R for Teletext
113 G O G for Teletext
114 B O B for Teletext
115 VSSA - GND
116 VDDA I 2.5V
117 CVBS2 I Not used
118 VSSA - GND
119 VDDA I 2.5V
120 CVBS1B I Not used
121 CVBS1A I Video for Teletext
122 VSSA - GND
123 VDDA I 2.5V
124 KEY1 I Key scan data 1 [ON : H]
125 KEY2 I Key scan data 2 [ON : H]
126 MECA_SW I Main power ON / OFF control [ON : L]
127 (KEYP2)P5.3 I Not used: Error detection for digital tuner unit
128 TMODE I Test purpose
Function