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2.1.4. MAIN BOARD
The main board has CPU, which control the system, and TSW (Time Switch), which switch the
PCM telephone call way, as its main function. Furthermore, the main board has common
resources to the systems as clock function, clock making function, and so on. Also, I/F function,
which connects the system and the terminal units.
Function
Inside of
CPU Core
CPU
Serial DMA Controller
SCC1, SCC2
Inside of G/A TSW Function
HDLC Controller
Clock Function
Tone Generator Detection
Controller
Timer Counter
A/DPITS Communication
Controller
Parallel I/O Port
PCM Stream Controller
Following the programs, CPU function controls all the system.
Controls the transmission between SCC1 and Internal RAM
RAM.
SCC1 controls RS 232C interface. SCC2 is reserved.
Conducts a time division transforming process such as
PCM data temporally, and outputting the data to random
random PCM serial data stream.
Controls the transmission of DPITS data. Two channels
controller are equipped. Equivalent to MT8952B for KX-TD
Equivalent to Clock IC (MS6242) for KX-TD series.
1) Enables Three Persons Conference. (6 channels) / 2) Generates
a dual tone. (4 channels)
The basic frequency is 16.384 MHz. The timer counter is
composed of an interval timer of two channels, a watchdog
and baud rate generator.
Used to control the digital communication of 2B + D for analogue
typed telephones and digital typed telephones.
Used to receive comparatively slow status, and to control
status at bit unit. Parallel I/O Port is composed of system
port groups #A ~ #F, which can be able to access by 8 bit,
port group #G, which can be able to access by 4 bit.
Composed of the basic Timing generator of PCM stream,
eight channel pulse generator blocks.
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