Circuit Description
SF700AT
5-11
5-3 Memory
System memory consists of 128kB ROM and 32kB RAM. All of RAM is backed up. ROM and RAM are
selected by chip select lines, and data is accessed by the units position of the byte.
+5V power is applied to RAM through VB. This model facsimile machine uses a Li battery. A 1k resistor in
series with the positive battery terminal is for battery protection.
5-4 Modem and TX- and RX- Related Circuits
These circuits control signal transmission between the internal MODEM and the LIU or a remote MODEM.
The R96DFXL MODEM is a single-chip fax-MODEM having features to detect and generate DTMF tones.
TX OUT is the MODEM output port, and RX IN is the input port. /PORI is the IFC signal which enables
MODEM initialisation at system power on. D0 - D7 are data buses. RS0- RS4 are internal register select
signals which determine the mode. /MCS is the chip select signal, and /RD. /WR. are the read and write
control signals. RLSD is used for v.24 interface-related signals and /IRQ is the MODEM interrupt.
Refer to Figure 5-14 for available R96DFXL I/O ports.
Table 5-14: I/O Port
HALFTONE MODE
BINARY MODE
-
-
-
OPE RESET ENABLE
CML1 ON
CML1 OFF
BREAK
MAKE
+24V ON
+24V OFF
CIS LED ON
CIS LED OFF
-
PAPER JAM
DP DIALING MODE
DTMF DIALING MODE
-
CIRCUIT NAME
I/O
PIN NO
PIN NAME
STATE
DESCRIPTION
HT/_BINARY
GND
/OPE RESET
CML1_ON
/DP_ON
+24V_ON
GLED_ON
N.C.
/PJAM
GND
DIAL_MODE_IN
N.C.
N.C.
GP 02
GP 03
GP 04
GP 05
GP 06
GP 07
GP 11
GP 13
GP 16
(ONLY I)
GP 17
(ONLY I)
GP 19
(ONLY I)
GP 20
(ONLY I)
GP 21
(ONLY I)
O
O
O
O
O
O
O
O
I
I
I
I
I
H
L
H
L
H
L
H
L
H
L
H
L
H
L
-
H
L
H
L
H
L
-
-
100
1
2
3
4
5
63
61
75
76
94
93
91
Содержание SF700AT
Страница 2: ...Samsung Electronics Co Ltd APR 1998 Printed in Korea JF68 60A ELECTRONICS ...
Страница 34: ...Circuit Description 5 16 SF700AT MEMO ...
Страница 52: ...8 1 SF700AT 8 Exploded Views and Parts Lists 8 1 Total Assembly ...
Страница 54: ...SF700AT 8 3 Exploded Views and Parts Lists 8 2 Ass y OPE Unit ...
Страница 56: ...Exploded Views and Parts Lists SF700AT 8 5 8 3 Ass y RX COVER ...
Страница 61: ...Exploded Views and Parts Lists 8 10 SF700AT 8 7 Ass y Base ...
Страница 63: ...Exploded Views and Parts Lists 8 12 SF700AT 8 8 Harness ...