A soft modem is one that can be used to modulate/demodulate data to be sent serially over an analog channel directly, without the need for a serial data path to another entity to supply data or control signals.
This reference design shows the simplicity of such a design, how few resources of the processor it takes, and how well it performs on USA average lines. This design even omits the standard telecommunications codec, instead using a Pulse Width Modulation (PWM) for output and Analog-to-Digital Converter (ADC) for input. Since both of these peripherals are readily available from the many peripherals on one 56F8300/100 series device, along with more processing power than required from the single core, the design is a true one-chip, one-core system that includes telecommunications ability with room for even more system functionality.
TARGET DEVICES/PLATFORMS- 56F8300/100 Digital Signal Controllers
- Advanced motion control
- Home appliances
- Medical monitoring
- Multi-phase inverters
- Fire and security systems
- Power management
- Smart relays
- Point of sale terminals
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View Product Image View Block DiagramFeatures
- Hybrid architecture facilitates implementation of V.21 & V.22bis modem, control, and signal processing functions in one chip
- Consumes only 7.5 MIPS for the modem function - Only 15K words of Flash for the complete modem application and test harness
- High-performance, secured Flash memory eliminates the need for external storage devices
- Extended temperature range allows for operation of non volatile memory in harsh environments
- Flash memory emulation of EEPROM eliminates the need for external non volatile memory
- 32-bit performance with 16-bit code density
- On-chip voltage regulator and power management reduces overall system cost
- Off-chip memory expansion capabilities allow for glueless interfacing with the additional memory of external devices, without sacrificing performance
- Boots directly from Flash, providing additional application flexibility
- High-performance PWM with programmable fault capability simplifies design and promotes compliance with safety regulations
- PWM and ADC modules are tightly coupled to reduce processing overhead; only one of each is used by the modem
- General purpose input/output (GPIO) pins support application-specific needs
- Simple in-application Flash memory programming via Enhanced OnCE or serial communication
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