KX-FT57E - Panasonic Fax Service Manual (repair manual). Page 121

|

122

|

This custom IC is used for general FAX operations.

(1)

CPU:

This model uses a Z80 equivalent CPU operating at 12MHz.

Many of the peripheral functions are handled by a custom designed LSI.

Therefore, 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 the ROM or RAM and bank switching.

(5)

CCD I/F:

Controls document reading.

(6)

IMAGE DATA RAM:

Is inside the ASIC and uses 8KB which is used for image processing.

(7)

THERMAL HEAD I/F:

Transmits the recorded data to the thermal head.

(8)

TX MOTOR I/F:

Controls the transmission motor which feeds the document.

(9)

RX MOTOR I/F:

Controls the receiving motor which feeds the reading document.

(10)

OPERATION PANEL I/F:

Serial interface with Operation Panel.

(11)

I/O PORT:

I/O Port Interface (Ex. Sensor, etc.)

This 256 KB ROM (EPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK31).
The capacity of each bank is 8 KB.
The addresses of the common area are from 0000H to 7FFFH, and addresses from 8000H to 9FFFH are for the bank
area.

This 32 KB RAM has 8 KB of common area and bank area (BK0, BK1).
The capacity of each bank is 12 KB.
The addresses of the common area are from D000H to EFFFH, and the addresses from A000H to CFFFH are for the
bank area.

The 512 KB RAM is used for voice guidance (voice prompt) and TAM.  The voice prompt data is entered after IC4 is
installed on the P.C. board.  If the IC4 is replaced, it is necessary to re-enter the voice prompt data again.
(Refer to page 70.)