Panasonic KX-FP81C Service Manual ▷ View online
6.2.1. GENERAL BLOCK DIAGRAM
CROSS REFERENCE:
ANALOG UNIT BLOCK DIAGRAM(P.163)
125
KX-FP81C
6.3. CONTROL SECTION
6.3.1. BLOCK DIAGRAM
IC501
ASIC
ADR[1
5:13]
RBA[
5:0]
ADR[
12:0]
D
B
[7:0]
XR
D
XW
R
XROM
C
S
XRAM
C
S
XMDM
C
S
IC502
ROM
IC504
SRAM
IC505
MODEM
A
[1
7:0]
D[7
:0
]
XR
D
XC
S
A
[1
6:0]
D[7
:0
]
XR
D
XW
R
XC
S
A[4:
0
]
D[7
:0
]
XR
D
XW
R
XC
S
XWDE
R
R
IN
OU
T
GN
D
+5
V
+
3.3V
TO
OP-PANEL
K
S
T
A
R
T
,K
L
ATCH
KSCLK,KT
X
D
KRXD,JOG1, J
O
G
2
TO
CIS
SI,CLK
CISLED
O
N
SIG
TO
THRMAL
HEAD
THDAT,THCLK,T
HLAT
STB1,STB2
TM
+2
4
V
TO
MOTOR
TM[3:0],
T
X
E
TO
POWER
SUPPLY
+24V,+5V,PG
,D
G
O
P
-R
ESET
+2
4
V
X
R
E
SETI
X
O
R
ESET
XRES
E
T
X
B
A
CKEN
RESET-IC
+3V/
BATT
+5V/
BATT
VC
C
B
ATT
+
-
24MHz
32.768KHz
TX
RX
TO
ANALOG
PCB
A[12:0
]
RBA[5:0
]
A[11:0
]
RBA[2:0
]
A[4:0
]
+5
V
X
RAS
X
CAS
A[9:
0
]
D[7
:0
]
XR
D
XW
R
X
RAS
X
CAS
IC503
DRAM
A[7:4
]
RBA[5:0
]
PTOP
SENS
O
R
LED O
N
P
S
501
+5
V
C
N
504
C
N
503
C
N
505
C
N
502
C
N
506
CN501
IC509
ANALOG SWITCH
X
T
EST
(2
4
MHz)
X
TLI
126
KX-FP81C
6.3.2. MEMORY MAP
127
KX-FP81C
This custom IC is used for the general FAX operations.
1. CPU:
This model uses a Z80 equivalent to the CPU operating at
8 MHz. Most of the peripheral functions are performed by
custom-designed LSIs. Therefore, the CPU only works for
processing the results.
8 MHz. Most of the peripheral functions are performed by
custom-designed LSIs. Therefore, the CPU only works for
processing the results.
2. RTC:
Real Time Clock
3. DECODER:
Decodes the address.
4. ROM/RAM I/F:
Controls the SELECT signal of ROM or RAM and the bank
switching.
switching.
5. CIS I/F:
Controls the document reading.
6. IMAGE DATA RAM:
This memory is programmed into the ASIC and uses 8 KB
for the image processing. (See Fig. A.*)
for the image processing. (See Fig. A.*)
7. THERMAL HEAD I/F:
Transmits the recorded data to the thermal head.
8. MOTOR I/F:
Controls the transmission motor which feeds the document.
Controls the receiving motor which feeds the recording
paper.
paper.
9. OPERATION PANEL I/F:
Serial interface with Operation Panel.
10. I/O PORT:
I/O Port Interface.
11. ANALOG UNIT:
Electronic volume for the handset and the monitor.
Sends beep tones, etc.
6.3.3.
ASIC (IC501)
Fig. A
Note*:
This memory is incorporated into the ASIC (IC501) and used for the image processing.
Fig. A shows the memory map of the Image Data RAM.
128
KX-FP81C
