User guide

Digital Audio Networking Processor
CobraNet
2 ©Copyright 2006 Cirrus Logic, Inc. DS651PM25
Features
CobraNet
❒ Real-time Digital Audio Distribution via Ethernet
❒ No Overall Limit on Network Channel Capacity
❒ Supports Switched and Repeater Fast Ethernet Networks
❒ Fully IEEE 802.3 Ethernet Standards Compliant
❒ Fiber Optic and Gigabit Ethernet Variants Supported
❒ Ethernet infrastructure can be used simultaneously for
audio and data communications.
❒ Free CobraCAD™ Audio Network Design Tool
❒ High-quality Audio Sample Clock Delivery Over Ethernet
❒ Uncompressed 16-, 20-, and 24-bit Audio Transport
❒ Professional 48 khz and 96 kHz Sample Rate
❒ Low (1-1/3 ms) Latency
❒ Flexible Many-to-many Network Audio Routing
Capabilities
❒ Available in a family of modules and low-cost devices,
most without licensing fees or royalties.
CobraNet Interface
❒ Auto-negotiating, 100-Mbit, Full-duplex Ethernet
Connections
❒ Up to 64 Audio Channel I/O Capability
❒ Implements CobraNet protocol for real-time transport of
audio over ethernet.
❒ Local Management via 8-bit Parallel Host Port
❒ UDP/IP Network Stack with Dynamic IP Address
Assignment via BOOTP or RARP
❒ Remote Management via Simple Network Management
Protocol (SNMP)
❒ Available module form factor allows for flexible integration
into audio products.
❒ 120-MIPS Digital Signal Processor
❒ Non-volatile Storage of Configuration Parameters
❒ Safely Upgrade Firmware over Ethernet Connection
❒ LED Indicators for Ethernet Link Activity, Conductor
Status, and Fault Annunciation
❒ Watchdog Output for System Integrity Assurance
❒ Comprehensive Power-on Self Test (POST)
❒ Error and Fault Reporting and Logging Mechanisms
Host Interface
❒ 8-bit Data, 3- or 4-bit Address
❒ Virtual 24- or 32-bit Data and Addressing
❒ Polled, Interrupt, and DMA Modes of Operation
❒ Configure and Monitor CobraNet Interface
❒ Transmit and Receive Ethernet Packets at 100-Mbit Wire
Speed
Asynchronous serial interface
❒ Full-duplex Capable
❒ 8- and 9-bit Data Formats
❒ Standard Baud Rates up to 115.2 kbps
❒ Transmitter Tri-state Control for Multi-drop Networking
Synchronous Serial audio Interface
❒ 4 Bi-directional Interfaces Supporting Up to 64 Channels
of Audio I/O
❒ 48 kHz and 96 kHz Sample Rates
❒ 64FS, 128FS, and 256FS Bit Rates Supported
❒ Supports numerous synchronous serial formats including
I
2
S
❒ Up to 32-bit Data Resolution
Audio clock interface
❒ 4 Host Audio Clocking Modes for Maximum Flexibility in
Digital Audio Interface Design
❒ Low-jitter, 512FS (24.576 MHz) Master Clock Oscillator
❒ Synchronize to Supplied Master and/or Sample Clock
❒ Sophisticated jitter attenuation assures network
perturbations do not affect audio performance.
Audio routing and processing
❒ Single-channel Granularity in Routing from Synchronous
Serial Audio Interface to CobraNet Network
❒ Two levels of audio routing indirection absorbs any quirks
in audio I/O interface design in host system.
❒ Local Audio Loopback and Output Duplication Capability
❒ Peak-reading Audio Metering with Ballistics