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8.3.2.
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.
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 BLOCK
Electronic volume for the handset and TAM monitor.
Sends beep tones, etc.
Descriptions of Pin Distribution (IC1)
NO.
SIGNAL
1
VSSA
2
VDDA 3.3
3
AIN1
4
AIN2
5
AIN3
6
AMON
7
VSS
8
X32OUT
9
X32IN
10
VDD (3.3V / B)
11
XBACEN
12
XRAMCS
13
VDD (3.3V / B)
14
VDD (2.5V/B)
15
FTG
16
F1
17
F2/OP
18
FR/OP
19
CPC
20
RVN
21
IRDATXD/IOP
22
IRDARXD/IOP80
23
TXD/IOP
24
RXD/IOP
25
XRTS/IOP
26
XCTS/IOP
27
VDD (2.5V)
28
TONE1
I/O
POWER SUPPLIED
VOLTAGE
GND
3.3V
A
3.3V
A
3.3V
A
3.3V
A
3.3V
GND
O
3.3V/BATT
I
3.3V/BATT
-----
I
3.3V/BATT
O
3.3V/BATT
-----
-----
O
3.3V
O
3.3V
O
3.3V
O
3.3V
I
3.3V
I
3.3V
I
3.3V
O
3.3V
I
3.3V
I/O
3.3V
I
3.3V
I/O
3.3V
-----
A
3.3V
107
DESCRIPTION
POWER SOURCE (ANALOG GND)
POWER SOURCE (ANALOG +3.3V)
CIS IMAGE SIGNAL INPUT (SIG)
THERMISTOR TEMPERATURE WATCH INPUT
LINE VOLTAGE DETECTION SIGNAL INPUT (DCIN)
ANALOG SIGNAL MONITOR TERMINAL
POWER SOURCE (GND)
RTC (32.768KHz) CONNECTION
RTC (32.768KHz) CONNECTION
POWER SOURCE (+3.3V/LITHIUM BATTERY)
BACKUP ENABLE
XRAMCS
POWER SOURCE(+3.3V / LITHIUM BATTERY)
POWER SOURCE (+2.5V / LITHIUM BATTERY)
SH SIGNAL OUTPUT FOR CIS (SI)
01 SIGNAL OUTPUT FOR CIS (CLK)
OUTPUT PORT (CISON)
OUTPUT PORT (MDMRST)
INPUT PORT (CPC)
INPUT PORT (CISSEL)
INPUT PORT (JAM)
OUTPUT PORT (HSTX MUTE)
INPUT PORT (BELL)
PORT (TELRXEN)
INPUT PORT (PSHORT)
PORT (MDMTXEN)
POWER SOURCE (+2.5V)
TONE OUTPUT
KX-FT907BX-B / KX-FT907BX-W
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