Sharp FO-DC635U, Руководство по обслуживанию

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FO-DC635U
5 – 11
2.2. Backup memory block
This block consists of flash memory for the image memory and 256
Kbit SRAM backed up with a battery. The image memory has a stan-
dard capacity of 8 Mbytes, and it is possible to extend the memory to
16 Mbytes in total by installing the option memory FO-8MK to the con-
nector CNOP1.
2.2.1 TC58DVM72A (IC26)... pin-48, TSOP (128 Mbit NAND
FLASH)
This is non-volatile memory whose contents are not deleted even
when the power is turned off. 8 Mbytes are available as an area for
storing the encoded data of the copies or transmitted/received images.
It is controlled via the above-mentioned MAIN ASIC (IC6).
2.2.2 CS18LV02563 (IC19)... pin-28, SOP (256 Kbit SRAM)
Operation information before shutting off the power supply, user set-
ting content and soft switch content are stored. Even if the power sup-
ply of the main body is turned off, it is backed up with a lithium battery
(BAT1).
2.3. Modem block
The block is mainly composed of the G3 FAX modem FM336PLus
(IC30), and is provided with the following modem function.
2.3.1 G3 FAX modem
The modem satisfies the requirements specified in ITU-T recommen-
dations V.34 half-duplex, V.17, V.33, V.29, V.27 ter, V.21, and meets
the binary signaling requirements of V.8 and T.30 with Annex F.
Internal HDLC support eliminates the need for an external serial input/
output (SIO) device in the DTE for products incorporating error detec-
tion and T.30 protocol. The modem can perform HDLC framing per
T.30 at all data speeds. CRC generation/checking along with zero
insertion/deletion enhances SDLC/HDLC frame operations. Two FSK
(V.21 Ch. 1 and V.21 Ch. 2) flag pattern detectors facilitate FSK detec-
tion during high-speed reception. The modem features a programma-
ble DTMF transmitter/receiver and three programmable tone
detectors.
2.3.2 Features
• 2-wire half-duplex fax modem modes with send and receive data
rates up to 33.6 kbps.
- V.34 half-duplex, V.17, V.33, V.29, V.27 ter, and V.21 Channel 2
- Short train option in V.17 and V.27 ter
• 2-wire duplex data modem modes
- V.21, V.23 (75 bps TX/1200 bps RX or 1200 bps TX/75 bps RX)
• PSTN session starting
- V.8 and V.8 bis signaling
• HDLC support at all speeds
- Flag generation, 0-bit stuffing, ITU-T CRC-16 or CRC-32 calcula-
tion and generation
- Flag detection, 0-bit stuffing, ITU-T CRC-16 or CRC-32 check
sum error detection
- FSK flag pattern detection during high-speed receiving
• Tone modes and features
- Programmable single or dual tone generation
- DTMF receiver
- Tone detection with three programmable tone detectors
• Serial and parallel synchronous data
• Automatic Rate Adaptation (ARA) in V.34 half-duplex
• Auto-dial and auto-answer control
• TTL and CMOS compatible DTE interface
- ITU-T V.24 (EIA/TIA-232-E) (data/control)
- Microprocessor bus (data/configuration/control)
• Receive dynamic range:
- 0 dBm to -43 dBm for V.17, V.33, V.29, V.27ter and V.21
- -9 dBm to -43 dBm for V.34 half-duplex
• Caller ID Demodulation
• Single tone detection in Data Mode
• ADPCM Voice Mode (Conexant Proprietary)
• Programmable RSLD turn-on and turn-off thresholds
• Programmable transmit level: 0 to -15 dBm
• Adjustable speaker output to monitor received signal
• DMA support for interrupt lines
• Two 16-byte FIFO data buffers for burst data transfer with exten-
sion up to 255 bytes
• Diagnostic capability
• V.21 Channel 1 Flag detect and V.21 Channel 2 Flag detect
• +3.3 V operation with +5 V tolerant inputs
• +5 V analog signal interface
• 100-pin PQFP package
• Typical power consumption
- Normal mode:
VDD1 = 250 mW (+3.3 V for DSP); VDD = 35 mW (+5 V for IA)
- Sleep mode:
VDD1 = 20 mW (+3.3 V for DSP); VDD = 0.1 mW (+5 V for IA)