Functional Description
The ZL38004 is a hardware platform designed to support advanced acoustic echo canceller (with noise reduction) firmware applications available from Zarlink Semiconductor. These applications are resident in external memory and are down-loaded by the ZL38004 resident boot code during initialization.

FEATUREs
• 100 MHz (200 MIPs) Zarlink voice processor with
   Butterfly hardware accelerator and
   breakpoint/interrupt controller
• On-board Data (26 Kbytes), Instruction (24
   Kbytes RAM and Boot (3 Kbytes) ROM
• Dual ∆Σ ADCs with input buffer gain selection
   programmable to either 8 or 16 kHz sampling
• Dual ∆Σ DACs with output sampling of 8, 16, 44.1
   and 48 kHz and internal output driver
• 2048 tap Filter co-processor shared across up to
   16 separate functions in 128 tap increments
• Dual function Inter-IC Sound (I2S) or Secondary
   TDM port
• 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
• Watchdog and 2 auxiliary timers
• 11 General Purpose Input/Output (GPIO) pins
• General purpose UART port
• Bootloadable for future Zarlink 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

APPLICATIONs
• Hands-free car kits
• Full duplex speaker-phone for digital telephone
• Echo cancellation for video conferences
• Intercom Systems
• Security Systems