Panasonic KX-FT25LA Service Manual ▷ View online
6.3. CONTROL SECTION
6.3.1. BLOCK DIAGRAM
105
KX-FT25LA
6.3.2.
ASIC (IC1)
This custom IC is used for general FAX operations.
1. CPU
This model uses a Z80 equivalent CPU operating at 8MHz.
Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result.
Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result.
2. RTC
Real time clock.
3. DECODER
Decodes the address.
4. ROM/RAM I/F
Controls the SELECT signal of ROM or RAM and bank switching.
5. CIS I/F
Controls document reading.
6. IMAGE DATA RAM
This is inside the ASIC and has 8KB which is used for image processing.
7. THERMAL HEAD I/F
Transmits the recorded data to the thermal head.
8. MOTOR I/F
Controls the motor which feeds the document and feeds the reading document.
9. OPERATION PANEL I/F
Control port for Operation Panel.
10. I/O PORT
I/O Port Interface (for analog board port control).
11. ANALOG UNIT
Electronic volume for the handset and TAM monitor.
Sends beep tones, etc.
Sends beep tones, etc.
Explanation of the Pin Distribution (IC1)
Pin No.
Pin Name
Buffer Power Supply
Description
Digital
I/O
1
AIN1
Analog
Analog video signal
AIN1
2
AIN2
Analog
Thermistor voltage
AIN2
3
AIN3
Analog
Thermistor voltage, etc.
VREFB
4
AMON
Analog
Analog monitor
OPEN
5
VSSB
Ground for analog video processing
GND
6
VDDB
Power supply for analog video processing
+3.3V
7
3.3V/BATT
RTC backup power supply
+3.3V/BATT
8
X32OUT
3.3V/BATT
32.768kHz crystal for RTC
X32OUT
9
X32IN
3.3V/BATT
32.768kHz crystal for RTC
X32IN
10
VSS
Ground
GND
11
XBACKEN
5V/BATT
Backup enable
XBACKEN
12
5V/BATT
RAMCS buffer/Backup power supply for reset
5V/BATT
13
XRAMCS
5V/BATT
SRAM chip selection
SRAMCS
14
FTG
5V
FTG
FTG
O/Z
15
F1
5V
F1 (50%/75% selection)
F1
O/Z
16
F2/OP50
5V
F2/Output port selection
E
O
17
FR/OP51
5V
FR/Output port selection
RS
O
18
CPC
5V
CPC (also used as Input port)
CPC
I
19
5V
Power supply for buffer
+5V
20
VSS
Ground
GND
21
RVN
5V
RVN (for both scanner encoder and input port)
KIN0
I
22
IRDATXD/IOP81
5V
TXD for IrDA/Input output port selection
OPSEL
O
23
IRDARXD/IOP80
5V
RXD for IrDA/Input output port selection
TEST (CISON)
O
24
TXD/IOP30
5V
UART/Input output port selection
TELRXENB
O
25
RXD/IOP31
5V
UART/Input output port selection
KIN1
I
26
XRTS/IOP32
5V
UART/Input output port selection
KIN2
I/O
27
XCTS/IOP33
5V
UART/Input output port selection
KIN3
I/O
28
MIDAT/IOP45
5V
Cross point IC/Input output port selection
MDMTXENB
O
29
MICLK/IOP46
5V
Cross point IC/Input output port selection
TONE1ENB
O
106
KX-FT25LA
Pin No.
Pin Name
Buffer Power Supply
Description
Digital
I/O
30
TONE1
3.3V
TONE1 (Analog output)
TONE1
31
TONE2
3.3V
TONE2 (Analog output)
TONE2
32
VOLU1
(3.3V)
Electronic volume REF for speaker
EVOL REF
33
VOLU2
(3.3V)
Electronic volume OUT for speaker
EVOL OUT
34
VOLU3
(3.3V)
Electronic volume IN for speaker
EVOL IN
35
MILAT/IOP47
5V
Cross point IC/Input output port selection
H/SRXENB
O
36
XNMI/XINT
5V
NMI/INT Input port selection
+5V
37
FMEMDO/IOP26
5V
Flash memory/Input output port selection
ALE (FLASH)
O
38
FMEMDI/IOP25
5V
Flash memory/Input output port selection
FCE (FLASH)
O
39
FMEMCLK/IOP24
5V
Flash memory/Input output port selection
R/B (FLASH)
I
40
VSS
Ground
GND
41
5V
Power supply for buffer
+5V
42
20KOSC/IOP56
5V
20kHz clock output/input output port selection
CLE (FLASH)
O
43
XWAIT/IP60
5V
Input port/XWAIT output at external CPU mode
HOOK
I
44
XHSTRD/IOP40
5V
CS*RD/input output port selection
FRD (FLASH)
O
45
XHSTWR/IOP41
5V
CS*WR/input output port selection
FWR (FLASH)
O
46
XOPRBE/
5V
OPRBE/DRAM address multiplex control/output port
SP-MUTE
O
MUX/OP53
47
ADR15
5V
Address pin for debug
OPEN
48
ADR14
5V
Address pin for debug
OPEN
49
ADR13
5V
Address pin for debug
OPEN
50
3.3V
Power supply for internal logic
+3.3V
51
XOUT
3.3V
24MHz crystal
XOUT
O
52
XIN
3.3V
24MHz crystal
XIN
I
53
VSS
Ground
GND
54
5V
Power supply for buffer
+5V
55
XTEST
5V
24MHz clock output
XTEST
O
56
TEST1
5V
Test pin. fixed High
+5V
57
TEST2
5V
Test pin. fixed High
+5V
58
TEST3
5V
Test pin. fixed High
+5V
59
TEST4
5V
Test pin. fixed High
+5V
60
XMDMINT
5V
MODEM interrupt
XMDMINT
O
61
XMDMCS
5V
MODEM chip selection
XMDMCS
O
62
VSS
Ground
GND
63
3.3V
Power supply for internal logic
3.3V
64
XRAS/IOP42
5V
RAS/input output port selection
XMDMRST
O
65
XCAS1/IOP43
5V
CAS of DRAM1/input output port selection
MDMCSBR
O
66
XCAS2/IOP44
5V
CAS of DRAM2/input output port selection
BELL
I
67
XRESCS2/OP71
5V
Chip selection 2/output port selection
RLY
O
68
DB3
5V
Data bus
D3
I/O
69
DB2
5V
Data bus
D2
I/O
70
DB4
5V
Data bus
D4
I/O
71
DB1
5V
Data bus
D1
I/O
72
DB5
5V
Data bus
D5
I/O
73
DB0
5V
Data bus
D0
I/O
74
DB6
5V
Data bus
D6
I/O
75
VSS
Ground
GND
76
3.3V
Power supply for internal logic
+3.3V
77
DB7
5V
Data bus
D7
I/O
78
XROMCS
5V
ROM chip selection
XROMCS
O
79
XRD
5V
Read pulse output
/RD
O
80
XWR
5V
Write pulse output
/WR
O
81
VSS
Ground
GND
82
5V
Power supply for buffer
+5V
83
ADR0
5V
Address bus
A0
O
84
ADR1
5V
Address bus
A1
O
85
ADR2
5V
Address bus
A2
O
86
ADR3
5V
Address bus
A3
O
87
ADR4
5V
Address bus (also used as DRAM address)
A4
O
88
ADR5
5V
Address bus (also used as DRAM address)
A5
O
89
ADR6
5V
Address bus (also used as DRAM address)
A6
O
90
ADR7
5V
Address bus (also used as DRAM address)
A7
O
91
ADR8
5V
Address bus
A8
O
92
ADR9
5V
Address bus
A9
O
93
ADR10
5V
Address bus
A10
O
94
ADR11
5V
Address bus
A11
O
95
ADR12
5V
Address bus (SRAM can´t be used.)
A12
O
107
KX-FT25LA
Pin No.
Pin Name
Buffer Power Supply
Description
Digital
I/O
96
VSS
Ground
GND
97
5V
Power supply for buffer
+5V
98
RBA0
5V
Bank address (also used as DRAM address)
A13
O
99
RBA1
5V
Bank address (also used as DRAM address)
A14
O
100
RBA2
5V
Bank address (also used as DRAM address)
A15
O
101
RBA3
5V
Bank address (also used as DRAM address)
A16
O
102
RBA4
5V
Bank address (also used as DRAM address)
A17
O
103
RBA5/OP
5V
Bank address (also used as DRAM address)/output
port selection
port selection
A18
O
104
RBA6/IOP96
5V
Bank address/Input output port selection
PAPER
I
105
STB1
5V
Thermal head strobe 1
STB1
O
106
STB2
5V
Thermal head strobe 2
STB2
O
107
STB3
5V
Thermal head strobe 3
OPEN
108
XRESET
5V
Reset input for internal digital circuit
XRESET
I
109
XORESET
5V
No chattering RESET (Noise reduction of XRESET )
XORESET
O
110
5V
Power supply for buffer
+5V
111
VSS
Ground
GND
112
XRESETI
5V
Input the comparator output for reset.
XRESETI
I
113
XWDERR
5V
Watch dog error
XWDERR
OD
114
THDAT
5V
Thermal head data
TH DATA
O
115
THCLK
5V
Thermal head clock
TH CLK
O
116
3.3V
Power supply for internal logic
+3.3V
117
VSS
Ground
GND
118
THLAT
5V
Thermal head latch
TH LAT
O
119
STBNP
5V
Input port
MOTOR POS.
I
120
RM0/IOP00
5V
Motor control/input output selection
T5
O
121
RM1/IOP01
5V
Motor control/input output selection
T4
O
122
RM2/IOP02
5V
Motor control/input output selection
T3
O
123
RM3/IOP03
5V
Motor control/input output selection
T2
O
124
RXE/IP04
5V
Motor control/input selection
T0
O
125
TM0/IOP10
5V
Motor control/input output selection
KSTART
O
126
5V
Power supply for buffer
+5V
127
VSS
Ground
GND
128
TM1/IOP11
5V
Motor control/input output selection
LED ON
O
129
TM2/IOP12
5V
Motor control/input output selection
THON
O
130
TM3/IOP13
5V
Motor control/input output selection
KTXD
O
131
TXE/IP14
5V
Motor control/input selection
KRXD
I
132
KSTART
5V
Operation panel I/F
KSCLK
O
133
KLATCH
5V
Operation panel I/F (also used as output port)
KLATCH
O
134
KSCLK
5V
Operation panel I/F
OPEN
135
KTXD
5V
Operation panel I/F
OPEN
136
KRXD
5V
Operation panel I/F
GND
137
ADSEL1
5V
AIN2 control 1
ADSEL1
O/Z
138
VSSC
Ground for analog video processing
GND
139
VDDC
Power supply for analog video processing
+3.3V
140
VSSA
Ground for analog video processing
GND
141
VDDA
Power supply for analog video processing
+3.3V
142
VREFB
Analog
A/D Reference -
VREFB
143
VCL
Analog
Clamp level
VCL
144
VREFT
Analog
A/D Reference +
OPEN
108
KX-FT25LA
Click on the first or last page to see other KX-FT25LA service manuals if exist.