Icom IC-R20 Service Manual - Page 21

D/a Converter Ic Port Allocations

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4-5-2 SUB CPU PORT ALLOCATIONS (REC UNIT; IC2) Pin number 18 Port name RSTO Description Input port for the USB reset signal. 19 PWREN Input port for the USB suspend signal. 24 FIFOST Outputs recording/playing select signal. Input port for the ADPCM command 25 CBUSY waiting signal. 26-28 EMP MID FUL Input ports for the ADPCM buffer signals. 35 36 B_SQL A_SQL Output recording mute signals. Input port for the power supply verify25 SUB_3C ing signal. 4-5-3 EXPANDER IC PORT ALLOCATIONS (RF UNIT; IC22) Pin number 4 Port name Description DOWN_CONV Outputs signal. the down converter control 5 2GLO Outputs 2002 MHz LO select signal for the down converter. 6 1GLO Outputs 1001 MHz LO select signal for the down converter. 7 ANTSW Outputs the bar antenna select signal. High : The bar antenna is selected. Outputs the power save control signal to the A-BAND circuit. 11 APS Low : While the A-BAND circuit is power saving. 12 A_WFM Outputs WFM mode select signal at the A-BAND circuit. 13 NBC Outputs noise blanker control signal. Outputs the power save control signal 14 BPS to the B-BAND circuit. Low : While the B-BAND circuit is power saving. 4-5-4 D/A CONVERTER IC PORT ALLOCATIONS (RF UNIT; IC14) Pin number 2 Port name Description A_VHFC Outputs VHF band selecting signal at the A-BAND circuit. Outputs 300 MHz band selecting sig3 A_300MC nal at the A-BAND circuit. 4 A_UHFC Outputs UHF band selecting signal at the A-BAND circuit. Outputs the A-BAND 1st LO circuit 6 A_VCO3 control signal. 7 A_NFMC Outputs narrow FM mode selecting signal at the A-BAND circuit. Outputs ANL (Automatic Noise Limiter) 13 A_ANLC control signal at A-BAND circuit. High : While ANL is ON. Outputs AM mode selecting signal at 18 A_AMC the A-BAND circuit. 19 SSBC Outputs narrow SSB mode selecting signal at the A-BAND circuit. 4-5-5 D/A CONVERTER IC PORT ALLOCATIONS (RF UNIT; IC20) Pin number 2 Port name Description B_VHFC Outputs VHF band selecting signal at the B-BAND circuit. 3 B_UHFC Outputs UHF band selecting signal at the B-BAND circuit. 4 B_GC Outputs GHz band selecting signal at the B-BAND circuit. 5 B-800MC Outputs 800 MHz band selecting signal at the B-BAND circuit. Outputs wide FM mode selecting sig7 A_WFMC nal at the B-BAND circuit. 8 B_VCO1 Outputs the B-BAND control signal. 1st LO circuit Outputs ANL (Automatic Noise Limiter) 9 B_ANLC control signal at B-BAND circuit. High : While B-BAND ANL is ON. 18 A_AMC Outputs AM mode selecting signal at the B-BAND circuit. Outputs narrow AM or narrow FM 19 B_AM_FM mode selecting signal at the B-BAND circuit. 4 - 13

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4 - 13
18
19
24
25
26
–
28
35
36
25
Input port for the USB reset signal.
Input port for the USB suspend signal.
Outputs recording/playing select sig-
nal.
Input port for the ADPCM command
waiting signal.
Input ports for the ADPCM buffer sig-
nals.
Output recording mute signals.
Input port for the power supply verify-
ing signal.
4-5-2 SUB CPU PORT ALLOCATIONS
(REC UNIT; IC2)
RSTO
PWREN
FIFOST
CBUSY
EMP
MID
FUL
B_SQL
A_SQL
SUB_3C
Pin
Port
Description
number
name
4
5
6
7
11
12
13
14
Outputs the down converter control
signal.
Outputs 2002 MHz LO select signal for
the down converter.
Outputs 1001 MHz LO select signal for
the down converter.
Outputs the bar antenna select signal.
High
: The bar antenna is selected.
Outputs the power save control signal
to the A-BAND circuit.
Low : While the A-BAND circuit is
power saving.
Outputs WFM mode select signal at
the A-BAND circuit.
Outputs noise blanker control signal.
Outputs the power save control signal
to the B-BAND circuit.
Low : While the B-BAND circuit is
power saving.
DOWN_CONV
2GLO
1GLO
ANTSW
APS
A_WFM
NBC
BPS
Pin
Port
Description
number
name
4-5-3 EXPANDER IC PORT ALLOCATIONS
(RF UNIT; IC22)
2
3
4
6
7
13
18
19
Outputs VHF band selecting signal at
the A-BAND circuit.
Outputs 300 MHz band selecting sig-
nal at the A-BAND circuit.
Outputs UHF band selecting signal at
the A-BAND circuit.
Outputs the A-BAND 1st LO circuit
control signal.
Outputs narrow FM mode selecting
signal at the A-BAND circuit.
Outputs ANL (Automatic Noise Limiter)
control signal at A-BAND circuit.
High
: While ANL is ON.
Outputs AM mode selecting signal at
the A-BAND circuit.
Outputs narrow SSB mode selecting
signal at the A-BAND circuit.
A_VHFC
A_300MC
A_UHFC
A_VCO3
A_NFMC
A_ANLC
A_AMC
SSBC
Pin
Port
Description
number
name
4-5-4 D/A CONVERTER IC PORT ALLOCATIONS
(RF UNIT; IC14)
2
3
4
5
7
8
9
18
19
Outputs VHF band selecting signal at
the B-BAND circuit.
Outputs UHF band selecting signal at
the B-BAND circuit.
Outputs GHz band selecting signal at
the B-BAND circuit.
Outputs 800 MHz band selecting sig-
nal at the B-BAND circuit.
Outputs wide FM mode selecting sig-
nal at the B-BAND circuit.
Outputs the B-BAND 1st LO circuit
control signal.
Outputs ANL (Automatic Noise Limiter)
control signal at B-BAND circuit.
High
: While B-BAND ANL is ON.
Outputs AM mode selecting signal at
the B-BAND circuit.
Outputs narrow AM or narrow FM
mode selecting signal at the B-BAND
circuit.
B_VHFC
B_UHFC
B_GC
B-800MC
A_WFMC
B_VCO1
B_ANLC
A_AMC
B_AM_FM
Pin
Port
Description
number
name
4-5-5 D/A CONVERTER IC PORT ALLOCATIONS
(RF UNIT; IC20)