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TI tips low-end VoIP DSP

Posted: 14 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DSP cores? VoIP? TI chips?

Texas Instruments Inc. has expanded its TMS320C55 DSP family with the new TNETV2502 geared for entry-level VoIP phones.

TI worked with software partner Adaptive Digital Technolologies Inc. to define a minimal feature set for the software. A single channel of G.711 or G.729AB codec support is offered, and the IP feature set includes session initiation protocol client and basic call-control functions. On the hardware side, the phones will support a single Ethernet port, optional LCDs and speakers, and a choice of either PoE or a local power supplyand little else.

"Obviously, this can be a foot in the door in both the hardware and software sense, and the OEM will design with the attitude that many end customers will want to buy up as they become comfortable with VoIP," said Brent Lorenz, VoIP product manager at TI.

The 300MHz DSP core does not use a MIPS control-plane core, as future members of the family are expected to do. The DSP core is surrounded by three multichannel buffered serial ports, eight general-purpose I/Os, four timers and a UART. On-chip memory includes 16Kbytes of instruction cache, 64Kbytes of RAM and a glueless interface to external SRAM or SDRAM.

TI is lowering the licensing costs by providing royalty-free BIOS and OS software for the DSP, and by eliminating license kit fees for the basic package. OEMs that want the software customized beyond the basic package can receive help through ADT.

- Loring Wirbel
EE Times

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