Devices increase VOIP and wireless performance
By Robert Cravotta -- EDN, December 7, 2004
Freescale’s MSC812X devices integrate as many as four SC140 DSP cores, along with as much as 1.43 Mbytes of on-chip memory, a turbo-coding coprocessor, and a Viterbi coprocessor in a single package to support high-density, carrier-class VOIP (Voice over Internet Protocol) and wireless-infrastructure applications (Picture). The two coprocessors are available only on the MSC8126, and at 500 MHz, can handle 400 Viterbi-decoding channels and 20 turbo-coding, 384-kbps channels, and they can provide 80 complete symbol-rate channels of 3GPP (Third Generation Partnership Project) voice AMR (adaptive-multirate) channels at 12.2 kbps or 20 data channels of 3GPP at 384 kbps, including symbol- and chip-rate-assistance functions.
The MSC812x devices include a 166-MHz SDRAM controller, an Ethernet controller for 10/100BaseT, an MII (media-independent interface), an RMII (reduced MII), an SMII (serial MII), 32- and 64-bit host ports to connect with host microprocessors, and multichannel TDM (time-division-multiplexing) ports supporting as much as 80 Mbps each. The 500-MHz MSC8122 and MSC8126 will be available for sampling in January 2005 and supporting full production in April 2005. The 300- and 400-MHz devices are available for sampling now with production support in January 2005. The MSC812x devices are available in lead and lead-free, 431-pin FC-PBGA, 20×20-mm packages. Freescale also offers the field-hardened VeriCall software framework from Trinity Convergence (www.trinityconvergence.com).
Freescale Semiconductor, 1-800-521-6274, www.freescale.com.
