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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 6MHz.
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. MODEM
Execute modulation and demodulation for the FAX.
5. ROM/RAM I/F
Controls the SELECT signal of ROM or RAM and bank switching.
6. CIS I/F
Controls document reading.
7. IMAGE DATA RAM
This is inside the ASIC and has 8KB which is used for image processing.
8. THERMAL HEAD I/F
Transmits the recorded data to the thermal head.
9. MOTOR I/F
Controls the motor which feeds the document and feeds the reading document.
10. OPERATION PANEL I/F
Serial interface with Operation Panel.
11. I/O PORT
I/O Port Interface (for analog board port control).
12. ANALOG UNIT
Electronic volume for the handset and monitor.
Sends beep tones, etc.
Explanation of the Pin Distribution (IC1)
Pin Pin Name Buffer Power supply 5V Tolerant Signal Name I/O Description
1 X32OUT VDDRTC - X32OUT 32.768kHz oscillator for RTC (built-in feed back
resistor)
2 X32IN VDDRTC NO X32IN 32.768kHz oscillator for RTC (built-in feed back
resistor)
3 VDDRTC +3.3V/BATT 32.768kHz backup power supply for RTC
4 XBACKEN VDDRTC YES XRESET Backup enable
5 VDDSRAM +3.3V/BATT RAMCS buffer/backup power supply for reset
6 XRAMCS VDDSRAM - VDDSRAM SRAM chip select ("H": 3.3V or BATT)
7 XRAMCE2/ALARM VDDSRAM - OPEN Not used
8 FTG MULT3/5 NO FTG O FTG
9 F1 MULT3/5 NO F1 O F1 (50%/75% selector)
10 MULT3/5 +5V Power supply
11 VSS DG Ground
12 F2/OP50 MULT3/5 NO E O LCD control
13 FR/OP51 MULT3/5 NO OPEN O Not used
14 XRESET 3.3V YES XRESET Reset input for internal digital circuit
15 VSS DG Ground
16 XORESET 3.3V - XORESET Reset output
17 XRESETI 3.3V YES XRESETI Voltage detector IC output for reset
18 XWDERR 3.3V YES XWDERR Watch dog timer error
19 XRSTSWO/OP82 3.3V YES OPEN O Not used
20 VIDRST/IOP20 3.3V YES OPEN O Not used
21 SPHCLK/IOP21 3.3V YES OPEN O Not used
22 DARKON/IOP22 3.3V YES OPEN O Not used
23 ADSEL2/IOP23 3.3V YES OPEN O Not used
24 BELL/OP 3.3V YES OPEN O Not used
25 3.3V +3.3V Power supply
101
KX-FT21RS