Command, control, and status information is available to the host interface, and all TDM data is routed to the DSP module sites, via the programmable PLD switch matrix.

Combined with SigC54xx or SigC55xx processor modules, the SigSD4-SODIMM Audio Module offers multichannel 16-bit sigma-delta analog I/O as an integrated component in the modular solution. Audio Module features include:

• sigma-delta converters provide sharp anti-alias and reconstruction filter roll-off, and nearly ideal linear phase response

• sampling rates and filter cutoff frequencies are software programmable; all channels are sampled simultaneously

• TDM (time division multiplex) serial output allows distribution of multichannel audio data to one or more DSP processors; audio data can be replicated among processors, or distributed uniformly, as needed

• analog input/output signals are routed directly to the module using a small-outline Mictor 38-pin connector that supports individually shielded conductors.

DirectDSP® Software Support

The Super I/O board is supported by Signalogic off-the-shelf software products designed for real-time processing code development, including:

DirectDSP® is a Windows library that provides low-level and high-level calls for user-defined C/C++, Visual Basic, MATLAB®, or LabVIEW®programs. The DirectDSP API includes low-level hardware control functions such as reset/run/hold, register access, block memory transfer, COEFF executable file download, etc. High-level functions include waveform file acquire/generate, continuous signal generation and execution of any arbitrary Hypersignal DSP or math function. DirectDSP includes strip-chart recorder, digital oscilloscope and digital tape recorder demo program and source code examples.

DirectDSP software provides Plug-N-Play compatible Win9x and WinXP drivers.

DirectDSP software also includes a telecom extension API which allows access to onboard logic functions, TDM routing / switch table functions, and the T1/E1 and network interfaces.

VDS Software Support

VDS® (Voice-over-packet Development System) software is an integrated environment that includes numerous development, analysis, measurement, test debug, and simulation functions for developing VoIP and VoATM systems.

The VDS environment combines both simulation and real-time operating modes. It includes support for several types of off-the-shelf DSP hardware, including SigC54xx cards and systems, InterWorks™ multiprocessor telecom modules, and Texas Instruments® DSK boards.

VDS test and measurement features include both packet analysis and packet impairment. Packets may deliberately be impaired with a variety of error types in order to debug and measure performance system components such as jitter buffer and echo canceller. The VDS environment and architecture supports operation as a fully automated test system.

Individual voice and audio processing components within VDS may be configured either as DSP software (DSP Mode, running on supported DSP hardware), or as host PC software components (Host Mode). Within the VDS user-interface, software components can be easily configured as DSP Mode or Host Mode in various combinations. This flexible and interactive configuration facilitates both development and analysis phases of VoIP and VoATM projects.

VDS includes network-side and telephony-side configuration and management. Voice software settings include CODEC type, echo canceller, jitter buffer, silence suppression, real-time parameters, and packet impairment test and measurement options. Voice software selections made from the GUI directly set properties in the Telogy voice software running in real-time on the C54xx DSP devices.

Note that if the Super I/O is used as a development system or in development mode, it must be plugged into a passive carrier card.