Panasonic KX-FT901CX-B

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 I/O POWER SUPPLIED
VOLTAGE
DESCRIPTION
1 VSSA GND POWER SOURCE (ANALOG GND)
2 VDDA 3.3 3.3V POWER SOURCE (ANALOG +3.3V)
3 AIN1 A 3.3V CIS IMAGE SIGNAL INPUT (SIG)
4 AIN2 A 3.3V THERMISTOR TEMPERATURE WATCH INPUT
5 AIN3 A 3.3V LINE VOLTAGE DETECTION SIGNAL INPUT (DCIN)
6 AMON A 3.3V ANALOG SIGNAL MONITOR TERMINAL
7 VSS GND POWER SOURCE (GND)
8 X32OUT O 3.3V/BATT RTC (32.768KHz) CONNECTION
9 X32IN I 3.3V/BATT RTC (32.768KHz) CONNECTION
10 VDD (3.3V / B) ----- POWER SOURCE (+3.3V/LITHIUM BATTERY)
11 XBACEN I 3.3V/BATT BACKUP ENABLE
12 XRAMCS O 3.3V/BATT XRAMCS
13 VDD (3.3V / B) ----- POWER SOURCE(+3.3V / LITHIUM BATTERY)
14 VDD (2.5V/B) ----- POWER SOURCE (+2.5V / LITHIUM BATTERY)
15 FTG O 3.3V SH SIGNAL OUTPUT FOR CIS (SI)
16 F1 O 3.3V 01 SIGNAL OUTPUT FOR CIS (CLK)
17 F2/OP O 3.3V OUTPUT PORT (CISON)
18 FR/OP O 3.3V OUTPUT PORT (MDMRST)
19 CPC I 3.3V INPUT PORT (CPC)
20 RVN I 3.3V INPUT PORT (CISSEL)
21 IRDATXD/IOP I 3.3V INPUT PORT (JAM)
22 IRDARXD/IOP80 O 3.3V OUTPUT PORT (HSTX MUTE)
23 TXD/IOP I 3.3V INPUT PORT (BELL)
24 RXD/IOP I/O 3.3V PORT (TELRXEN)
25 XRTS/IOP I 3.3V INPUT PORT (PSHORT)
26 XCTS/IOP I/O 3.3V PORT (MDMTXEN)
27 VDD (2.5V) ----- POWER SOURCE (+2.5V)
28 TONE1 A 3.3V TONE OUTPUT
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KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S