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