Sharp FO-90 Service Manual page 34

FO-90RA
(4) Modem (FM209V) block
INTRODUCTION
The CONEXANT FM209V MONOFAX modem is a synchronous 9600
bits per second (bps) half-duplex modem with error detection and DTMF
reception. It has low power consumption and requires a single +5V and
+3.3V DC power supply. The modem is housed in a single VLSI device
package.
The modem can operate over the public switched telephone network
(PSTN) through line terminations provided by a data access arrange-
ment (DAA).
The FM209V is designed for use in Group 3 facsimile machines.
The modem satisfies the requirements specified in CCITT recommen-
dations V.29, V.27 ter, V.21 Channel 2 and T.4, and meets the binary
signaling requirements of T.30.
The modem can operate at 9600, 7200, 4800, 2400, or 300 bps, and
also includes the V.27 ter short training sequence option.
The modem can also perform HDLC framing according to T.30 at 9600,
7200, 4800, 2400, or 300 bps.
The modem features a programmable DTMF receiver and three pro-
grammable tone detectors which operate concurrently with the V.21
channel 2 receiver.
The voice mode allows the host computer to efficiently transmit and
receive audio signals and messages.
The modem is available in either a 128-pin plastic quad flat pack (TQFP).
General purpose input/output (GPIO) pins are available for host as
signment in the 128-pin TQFP.
The modem's small size, single voltage supply, and low power con-
sumption allow the design of compact system enclosures for use in both
office and home environments.
MONOFAX is a registered trademark of CONEXANT.
TXD
RXD
DCLK
USART
(OPTIONAL)
RTS#
CTS#
RLSD#
READ#
WRITE#
DATA BUS
ADDR BUS
CS#
DECODER
RESET#
IRQ1#
IRQ2#
XTLI
CRYSTAL
XTLO
OFFHOOK
TALK
RINGD
DAA
LINEOUT
LINEIN
SPKRP
SPEAKER
DRIVER
SPKRM
(OPTIONAL)
FM209V
MONOFAX
MODEM
EYEXY
EYE
EYECLK PATTERN
GENERATOR
EYESYNC
(OPTIONAL)
POWER
SUPPLY
Fig. 5
FEATURES
•
Group 3 facsimile transmission/reception
- ITU-T V.29, V.27 ter, T.30, V.21 Channel 2, T.4
- ITU-T V.17 and V.27 ter short train
- HDLC framing at all speeds
- Receive dynamic range: 0 dBm to -43 dBm
- Automatic adaptive equalization
- Fixed and programmable digital compromise equalization
- DTMF detect and tone detect
- ITU-T V.21 Channel 2 FSK 7E Flag Detect
- Ring detector
- Programmable transmits level
- Programmable single/dual tone transmission
•
V.23 and Type I Caller ID
- Full-duplex modes:
TX = 75 bps. RX = 1200 bps
TX = 1200 bps. RX = 75 bps
- Half-duplex mode:
TX = RX = 1200 bps
- Serial and parallel data modes
- Programmable parallel data mode
- 5, 6, 7 or 8 data bits
- 1 or 2 Stop bits
- Mark, Space, Even, or Odd Parity
- Break function
- Transmitter squelch
- Compromise equalizer
•
TELEPHONE
Programmable interface memory interrupt
LINE
•
Eight General Purpose Input (GPI) and eight General Purpose Out-
put (GPO) pins for host assignment
•
DTE interface: two alternate ports
- Selectable microprocessor bus (6500 or 8085)
- ITU-T V.24 (EIA/TIA-232-E compatible) interface
•
TTL and CMOS compatible
•
3.3V/5V operation
•
Power consumption
- Operating Mode: 200 mW (Basic), 275 mW (-V option). 300 mW
(-VS option)
- Sleep Mode: 1 ma (Basic. -V option and -VS option)
•
Packaging
- 128-pin TQFP (thin quad flat pack)
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