Icom IC-7800 Service Manual Addendum page 362

3-7-4 MAIN CPU1 (LOGIC UNIT; IC103 )
Pin Port
number name
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.
Input port for the clock signal from the
125 PCICLK
buffer amplifier (IC106).
128 SERR I/O port for the system error signal.
129, 130, AD31, AD30,
133–138, AD29–AD24,
I/O ports for the buffer amplifier
140–142, AD23–AD21,
(IC106) address signals.
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.
Input port for the crystal oscillator sig-
194 EXTAL2
nal.
Input port for the hardware stand-by
197 CA
signal.
Description
Pin Port
number name
198, RESET,
199 TRST
200 MRESET Input port for the manual reset signal.
206 TXD
212 RXD
215 SCK
246 TDO
255 XTAL
256 EXTAL
3-7-5 RELAY CONTROLLER (CTRL BOARD; IC55)
Pin Port
number name
4 LPF2
5 LPF8
6 LPF4
7 LPF7
11 LPF5
12 LPF9
13 LPF6
14 LPF3
3-7-6 RELAY CONTROLLER (CTRL BOARD; IC56)
Pin Port
number name
4 LPF1
5 ANT4R
3 - 18
Description
Input ports for the reset signal.
Outputs the buffer amplifier (IC106)
data signal.
Input port for the buffer amplifier
(IC106) data signal.
I/O port for the buffer amplifier (IC106)
clock signal.
Outputs the data signal.
Output port for the crystal oscillator.
Input port for the crystal oscillator sig-
nal.
Description
Outputs the low-pass filter (2–4 MHz)
select signal.
Outputs the low-pass filter (22–30 MHz)
select signal.
Outputs the low-pass filter (6.9–10 MHz)
select signal.
Outputs the low-pass filter (18–22 MHz)
select signal.
Outputs the low-pass filter (10–14 MHz)
select signal.
Outputs the low-pass filter (30–60 MHz)
select signal.
Outputs the low-pass filter (14–18 MHz)
select signal.
Outputs the low-pass filter (4–6.9 MHz)
select signal.
Description
Outputs the low-pass filter (0.03–2 MHz)
select signal.
Outputs the antenna ([ANT 4]; RX
only) select signal for main band.