ZL38015

Overview

Simplified Block Diagram

Typical Applications

• Wireless Local Loop base stations and controllers Voice telephony gateways Digital, VoIP based and wireless PBX systems
• Echo Canceller pools
• Customer Premise equipment
• Integrated access devices
• SOHO gateways

Features & Benefits

• 100 MHz (200 MIPs) voice processor with hardware accelerator
• On-board memory
• 2048 tap Filter co-processor shared across up to 16 separate functions in 128 tap increments
• Primary PCM port supports TDM (ST BUS, GCI or McBSP framing) or SSI modes at bit rates of 128, 256, 512, 1024, 2048, 4096, 8192 or 16384 Kb/sec
• Separate slave (microcontroller) and master (Flash) SPI ports, maximum clock rate = 25 MHz
• 11 General Purpose Input/Output (GPIO) pins
• General purpose UART port
• Bootloadable for future software upgrades
• External oscillator or crystal/ceramic resonator
• 1.2 V Core; 3.3 V IO with 5 V-tolerant inputs
• IEEE-1149.1 compatible JTAG port

Firmware Overview

ZLS38233 - Advanced 4 Channel Voice Echo Canceller with DTMF Transceiver (Tx/Rx)

• Independent 4 channel echo cancellation with programmable echo tail length (maximum combined echo tail length of 256ms)
• Fully compliant to ITU-T G.165, G.168 (2000) and (2002) specifications
• Per channel Fax/Modem G.164 2100 Hz and G.165 2100 Hz phase reversal Tone Disable
• Fast reconvergence on echo path changes
• Fully programmable convergence speeds
• Patented Advanced Non-Linear Processor with high quality subjective performance
• Protection against narrow band signal divergence and instability in high echo environments
• G.169 ALC (automatic level control) maintains loop gain through a programmable gain range from 24 to 24 db
• Four independent DTMF Receivers  (DTMF Rx)
• Four independent programmable tone/DTMF generators (DTMF Tx)