CobraNet Hardware User’s Manual
Introduction
1.0 Introduction
This document is intended to help hardware designers integrate the CobraNetTM interface
into an audio system design. It covers the CS18100x, CS18101x, CS18102x, CS49610x,
CS49611x, and CS49612x members of the CobraNetTM Silicon Series of devices, where
“x” is the ROM version (ROM ID). This document also describes the CM-2 module with
schematics, mechanical drawings, etc.
CobraNet is a combination of hardware (the CobraNet interface), network protocol, and
firmware. CobraNet operates on a switched Ethernet network and provides the following
additional communications services.
• Isochronous (Audio) Data Transport
• Sample Clock Distribution
• Control and Monitoring Data Transport
The CobraNet interface performs synchronous-to-isochronous and isochronous-to-
synchronous conversions as well as the data formatting required for transporting real-time
digital audio over the network.
The CobraNet interface has provisions for carrying and utilizing control and monitoring
data such as Simple Network Management Protocol (SNMP) through the same network
connection as the audio. Standard data transport capabilities of Ethernet are shown here
as unregulated traffic. Since CobraNet is Ethernet based, in most cases, data
communications and CobraNet applications can coexist on the same physical network.
Figure 1 illustrates the different data services available through the CobraNet system.
Isochronous Data
Isochronous Data
(Audio)
(Audio)
Ethernet
Ethernet
Unregulated
Unregulated
Traffic
Traffic
Control Data
Control Data
Clock
Clock
Figure 1. CobraNet Data Services
DS651UM23
Version 2.3
©Copyright 2005 Cirrus Logic, Inc.
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