5-18
Samsung Electronics
Circuit Description
Fig.5-10 TX and RX Part
5-1-7 Modem and TX-and RX Related
Circuits
M O D E M
These circuits control signal transmission between the
internal modem and the LIU or a remote modem. The
KS16117 modem is a signal-chip fax-modem having
features to detect and generate DTMF tones. TX OUT
(pin44) is the modem output port, and RXIN (pin45) is
the input port. /PORI (pin67) from KS32C6100 is the
signal which enables modem initialization at system
power on.
D0~D7 (pin8-15) are the data bus RS0-RS4 (pin56~60)
are internal resister select signals which determine the
mode.
/CS (pin54) is chip select, /RD (pin55), /WR (pin53)
are read and write control signals. /IRQ (pin52) is
modem interrupt output signal. The transmission
speed of KS16117 is maximum 14.4 Kbps.
TRANSMIT CIRCUIT
This circuit controls transmission of analog signals
f
rom the modem (KS16117).
Output voltage from the modem (TXOUT:44) is
buffered through LIU board and OP-AMP after signal
smoothing and filtering, and finally output to the line.
RECEIVE CIRCUIT
In receive mode, analog signals from the LIU board are
amplified and transferred to RXIN:45 through the
smoothing filter.
Содержание MSYS 5150
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Страница 202: ...Samsung Electronics 12 13 Schematic Diagrams 12 5 Joint Circuit Diagram ...
Страница 203: ...Schematic Diagrams 12 14 Samsung Electronics 12 6 OPE Circuit Diagram IF Active HIGH Logic IF Active LOW Logic ...
Страница 204: ...Samsung Electronics 12 15 Schematic Diagrams 12 7 PTL Circuit Diagram ...
Страница 205: ...Schematic Diagrams 12 16 Samsung Electronics 12 8 SCAN Circuit Diagram ...
Страница 206: ...Samsung Electronics 12 17 Schematic Diagrams 12 9 Engin Circuit Diagram ...
Страница 207: ...Schematic Diagrams 12 18 Samsung Electronics Engin Circuit Diagram ...
Страница 208: ...Samsung Electronics 12 19 Schematic Diagrams 12 10 LIU Circuit Diagram ...
Страница 210: ... Samsung Electronics Co Ltd Mar 1999 Printed in Korea P N JC68 00097A Rev 1 00 ELECTRONICS ...