Icom IC-7800, Service Manual Addendum

Page: 362 / 555

3 - 18
3-7-4 MAIN CPU1 (LOGIC UNIT; IC103 )
1 TMS Input port for the mode signal.
2 TCK Input port for the clock signal.
5 TDI Input port for the data signal.
CS0
CS1
6–10 CS4 Output chip select signals.
CS5
CS6
11 BS Outputs bus starting signal.
12 WE0/REG Outputs D7–D0 select signal.
13 WE1 Outputs D15–D8 select signal.
14 D0 I/O port for the data signal.
19–28, D1–D10,
I/O ports for the data signals.
31–35 D11–D15
36 CAS0/DQM0 Outputs D7–D0 select signal.
37 CAS1/DQM1 Outputs D15–D8 select signal.
38 RD/WR Outputs read/write control signal.
39 CKIO Outputs clock signal.
49, CS2,
Output chip select signals.
50 CS3
51–54, A0–A3,
57–66, A4–A13, Output address signals.
69–72 A14–A17
73 CAS2/DQM2 Outputs D23–D16 select signal.
74 CAS3/DQM3 Outputs D31–D24 select signal.
75–78, D16–D19,
83–92, D20–D29, I/O ports for the data signals.
95, 96 D30, D31
99–104, A18–A23,
Output address signals.
107, 108 A24, A25
109 WE2/ICIORD Outputs D23–D16 select signal.
110 WE3/ICIOWR Outputs D31–D24 select signal.
113 SLEEP Input port for the sleep signal.
125 PCICLK
Input port for the clock signal from the
buffer amplifier (IC106).
128 SERR I/O port for the system error signal.
129, 130, AD31, AD30,
I/O ports for the buffer amplifier
133–138, AD29–AD24,
(IC106) address signals.
140–142, AD23–AD21,
147–151 AD20–AD16
156 DEVSEL I/O port for the device selecting signal.
164–168, AD15–AD11,
171–173, AD10–AD8, I/O ports for the buffer amplifier
177–182, AD7–AD2,
(IC106) address signals.
185, 186 AD1, AD0
187–190 IRL0–IRL3 Input ports for the interrupt signals.
193 XTAL2 Output port for the crystal oscillator.
194 EXTAL2
Input port for the crystal oscillator sig-
nal.
197 CA
Input port for the hardware stand-by
signal.
198, RESET,
Input ports for the reset signal.
199 TRST
200 MRESET Input port for the manual reset signal.
206 TXD
Outputs the buffer amplifier (IC106)
data signal.
212 RXD
Input port for the buffer amplifier
(IC106) data signal.
215 SCK
I/O port for the buffer amplifier (IC106)
clock signal.
246 TDO Outputs the data signal.
255 XTAL Output port for the crystal oscillator.
256 EXTAL
Input port for the crystal oscillator sig-
nal.
Pin Port
Description
number name
Pin Port
Description
number name
3-7-5 RELAY CONTROLLER (CTRL BOARD; IC55)
4 LPF2
Outputs the low-pass filter (2–4 MHz)
select signal.
5 LPF8
Outputs the low-pass filter (22–30 MHz)
select signal.
6 LPF4
Outputs the low-pass filter (6.9–10 MHz)
select signal.
7 LPF7
Outputs the low-pass filter (18–22 MHz)
select signal.
11 LPF5
Outputs the low-pass filter (10–14 MHz)
select signal.
12 LPF9
Outputs the low-pass filter (30–60 MHz)
select signal.
13 LPF6
Outputs the low-pass filter (14–18 MHz)
select signal.
14 LPF3
Outputs the low-pass filter (4–6.9 MHz)
select signal.
Pin Port
Description
number name
3-7-6 RELAY CONTROLLER (CTRL BOARD; IC56)
4 LPF1
Outputs the low-pass filter (0.03–2 MHz)
select signal.
5 ANT4R
Outputs the antenna ([ANT 4]; RX
only) select signal for main band.
Pin Port
Description
number name