ingle-Chip FaxEngine Product Family

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.

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