Icom IC-7800 Service Manual Addendum page 361

3-7-3 CPDL CPU (LOGIC UNIT; IC605)
Pin Port
number name
Outputs strobe signal to the band con-
39 CSTB
troller (CTRL board; IC51; pin 1).
Outputs strobe signals to the relay
controllers (CTRL board; IC55 and
40 FSTB
IC56, pin 1).
Outputs strobe signals to the relay
controllers (BPF unit; IC101 and
41 DPSTA
IC102, pin 5).
Outputs strobe signals to the relay
controller2 (BPF unit; IC401 and
42 DPSTB
IC402, pin 5).
Outputs the reference signal switching
signal.
49 OSS1
High : Outputs reference signal.
Outputs internal/external reference
signal select signal.
50 OSS2
Low : The external reference signal
Outputs chip select signal to adjust
52 OCS
the OCXO reference on the OSC unit.
Outputs strobe signals to the RX-A
53 RSTBA
circuit.
Outputs strobe signals to the RX-B
54 RSTBB
circuit.
Outputs the DIGISEL-A unit control
55 DSONA
signal.
Outputs the amplifier control signal to
56 DSAPA
the DIGISEL-A unit.
Outputs
58 DSTBA
DIGISEL-A unit.
Outputs the DIGISEL-B unit control
59 DSONB
signal.
Outputs the amplifier control signal to
60 DSAPB
the DIGISEL-B unit.
Outputs
61 DSTBB
DIGISEL-B unit.
63 MSTB1 Output strobe signals to the MAIN
64 MSTB2 unit.
Outputs strobe signal to the D/A con-
65 ASTB1
verter (MAIN unit; IC330; pin 15).
Outputs strobe signal to the D/A con-
66 ASTB2
verter (MAIN unit; IC331, pin 15).
Outputs frame signal for data setting
67 DFRA
to the DSP-A unit.
Outputs frame signal for data reading
68 DFXA
to the DSP-A unit.
Input port for voice squelch control
signal from the DSP-A board.
70 VSQA
High : Voice squelch is open.
Input port for RTTY, BPSK and QPSK
decoded data signal from the DSP-A
71 RTDA
board.
Input port for the tone squelch control
or QPSK decoding data signals.
72 TNDA
High : Tone squelch is open.
Description
is selected.
strobe signals to the
strobe signals to the
Pin Port
number name
74 DULSA
77 DFRB
78 DFXB
79 VSQB
81 RTDB
82 TNDB
85 DULSB
86 DFRT
87 DFXT
90 DAVOX
91 CTFL
92 DFRS
93 DFXS
94 DRESL
95 DRESH
3 - 17
Description
Outputs unlock signal to the DSP-A
board.
High : Unlock.
Outputs frame signal for data setting
to the DSP-B unit.
Outputs frame signal for data reading
to the DSP-B unit.
Input port for voice squelch control
signal from the DSP-B board.
High : Voice squelch is open.
Input port for RTTY, BPSK and QPSK
decoded data signal from the DSP-B
board.
Input port for the tone squelch control
or QPSK decoding data signals from
the DSP-B board.
High : Tone squelch is open
Outputs unlock signal to the DSP-B
board.
High : Unlock.
Outputs frame signal for data setting
to the DSP-TX unit.
Outputs frame signal for data reading
to the DSP-TX unit.
Input port for the ANT VOX control
signal.
High : While receiving.
Input port for the CW transmitting sta-
tus signal.
Outputs frame signal for data setting
to the DSP-SCOPE unit.
Outputs frame signal for data reading
data to the DSP-SCOPE unit.
Output reset signals to the DDS and
DSP ICs.