3-7
Samsung Electronics
CIRCUIT DESCRIPTION
Repair Manual
3-1-3 PROGRAM ROM (FLASH MEMORY)
1) DEVICE
TYPE No.
AM29F800B
CAPACITY
2 Mbit (512K * 16bit * 2)
2) PROGRAMMING
BEFORE ASS’Y
EPROM PROGRAMMER or PROGRAMMING at the factory
AFTER ASS’Y
DOWNLOAD from PC
3-1-4 DRAM CONTROL
1) DEVICE
TYPE NO.
K4E641611D-TC50(EDO Type)
CAPACITY
64 Mbit (4M * 16bit)
2) OPERATING PRINCIPLE
DRAM can either read or write. The data can be stored in the DRAM only when the power is on. It stores data white the
CPU processes data. The address to read and write the data is specified by RAS SIGNAL and CAS SIGNAL.
DRAMWE*SIGNAL is activated when writing data and DRAMOE*SIGNAL, when reading.
3-1-5 USB (Universal Serial Bus)
SAMSUNG’S UNICON is used as the interface IC and 48MHz clock is used.
When the data is received through the USB port, USBIRQ SIGNAL is activated to send interrupt to CPU, then it directly
sends the data to DRAM by USB_CS SIGNAL through D(0;7).
3-1-6 Modem and TX-and RX Related Circuits
MODEM
The Conexant™ FM336 modem is a V.34 half-duplex modem that supports Group 3 facsimile send and receive speeds
up to 33600 bps using the V.34 half-duplex mode. Using a V.34 technique to optimize modem configuration for line condi-
tions, the modem connects at the optimal selected data rate that the channel can support from 33600 bps to 2400 bps.
The modem can operate over the public switched telephone network (PSTN) through a line terminator provided by a Data
Access rrangement (DAA). The modem satisfies the requirements specified inITU-T recommendations V.34, V.17, V.29,
V.27 ter, V.23, V.21, and meets the binary signal ingrequirements of V.8 and T.30. Internal HDLC support eliminates the
need for an external serial input/output (SIO) device in the DTE for products incorporating error detection and T.30 proto-
col. The modem can perform HDLC framing per T.30 at all data speeds. CRC generation/checking along with zero inser-
tion/deletion enhances DLC/HDLC frame operations. An FSK flag pattern detector facilitates FSK detection during high
speed reception.The modem features a programmable DTMF transmitter/receiver and three programmable tone detectors
which operate in the tone mode.
The modem offers lower power consumption and small size to allow the design of compact system enclosures for use in
industrial, office, and home environments.The modem is available in a 100-pin PQFP package.
Summary of Contents for SF-530 Series
Page 87: ...Electronics ...
