[Conexant] 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. 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
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