GENERAL DESCRIPTION STMicroelectronics’ STLC1502 is a high performance VoIP processor specially targeted for the time effective design of IP-Phones and analog gateway applications bundled with a comprehensive embedded software solution. The main characteristics of the STLC1502 IP processor are as follows: • HCMOS7 technology • Power supply: Core 2.5 V and I/O: 3.3 V • Industry standard 32-bit RISC microprocessor (ARM7/TDMI core) • 16-bit, fixed point 120 MIPs DSP (D950) • Two 10/100 Base-T Ethernet MACs • VLAN support • Ethernet Bridge • JTAG • Smart power management REFERENCE SOFTWARE FEATURES Some of the features of the SW provided are: ARM7/TDMI • Industry standard Real time OS: VxWorks • Network Protocol Stack • TCP/IP, UDP, TFTP, DHCP, HTTP server • Ethernet/PC communication drivers • High Level Chip Control • Stack management • SNMP (optional) • Application Specific MIBS • Signalling Protocol • MGCP, H.323 (including H.450), SIP D950 Voice Codec Unit (VCU) features: • G.711 Packetized PCM • G.729AB, 8kbps CS-ACELP • G.726, 16-40 kbps ADPCM • G.723.1a, 6.3/5.3 kbps MP-MLQ • Encoding and decoding of PCM sample frames • Packing/unpacking of compressed information in Codewords • Fax Modem : T.38 Fax Relay, V.21, V.17, V.27ter and V.29 fax datapump • Data Modem: V.34 datapump • Rate selection • High performance voice activity detector (VAD) • Comfort noise generator (CNG) • G.165 32 ms Line & acoustic echo canceller • Low latency system implementation
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