CXD9450-24 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
CXD9450-24 Datasheet PDF : 16 Pages
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Single-Chip FaxEngine Product Family
Single-Chip FaxEngine (CXD9450)
and Integrated Analog Device (CX20415)
The Conexant™ Single-Chip FaxEngine product family consists of the Single-Chip
FaxEngine (CXD9450) that contains an embedded modem Digital Signal Processor
(DSP), and a separate Integrated Analog (IA) device (20415).
This device set, along with the supporting firmware and evaluation system,
comprises a complete facsimile machine—needing only power supply, scanner, and
printer mechanism components to complete the machine. A system-level block
diagram is shown in Figure 1.
Integrated Controller
The integrated controller (SCC) provides the majority of the electronics necessary to
build a thermal or thermal transfer facsimile machine integrated into a one-chip
solution. The controller performs primary facsimile control/monitoring and
compression/decompression functions, and interfaces with fax machine
components such as a scanner, printer, motor, and operator control panel. The
MC24 embedded processor provides an external 16-MB direct memory access
capability. An integrated Pipeline ADC, combined with Conexant's Image
Processing Scheme, provides state of the art image processing performance on text
and gray scale images.
Embedded Modem DSP
The embedded modem DSP supports V.29 and V.27 ter facsimile transmission and
reception, in addition to all basic HDLC functions and T.30 requirements. The
modem allows all line connections and single or dual tone generation and detection.
Optional features such as V.17, voice compression/decompression for Digital
Telephone Answering Machine (DTAM), and duplex speakerphone are also
available.
Figure 1. Single-Chip FaxEngine System Level Block Diagram
Local
Handset
Telephone
DAA
Line
Line IA
Speaker
Phone
Secondary
Line IA
Operator
Panel
Single-Chip FaxEngine (CXD9450)
DSP
SCC
CCD or CIS
Scanner
Thermal Printer or
Thermal Transfer
Plain Paper
Inkjet Printer
(Optional)
24
NOR
FLASH
2 MB
DRAM
8 MB
20
11
Control Bus
Data Bus
8
Address Bus 24
SRAM
8
1 MB
20
ROM
2 MB
20
Features
Microprocessor and
Bus Interface
• MC24 Central Processing Unit
− Up to 10 MHz CPU clock speed
− Memory efficient input/output bit
manipulation
− 24-bit internal address bus,
8-bit data bus
• External Bus
− Address, data, control, status,
and decoded chip select signals
support connection to external
ROM, SRAM, DRAM and
operator panel
− 24-bit external address bus
− 8-bit data bus
• Chip selects
− ROMCSn for ROM support
− CS0n for SRAM
− CS1n-CS5n for external I/O
− FCSn for FLASH memory
support
− LCDCS for LCD support
• DRAM Controller
− DRAM is refreshed in Sleep and
Stand-by modes
− Up to 8 MB supported in two
blocks
− Organizations supported:
4 or 8-bit
− Single and page mode access
support
• Flash memory support
− NAND and NOR-type support
− Serial NAND support
− NOR-type memory up to 2 MB
• DMA Controller
− Six dedicated internal DMA
channels for scanner, thermal
printer, and T.4/T.6 access of
internal and/or external
memory.
− DMA Channel 2 can be
reprogrammed for external
access to plain paper inkjet
printing
Data Sheet
Conexant
Doc. No. 100544C
September 8, 2000
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