Cirrus-logic CobraNet Audio Routing Primer Bedienungsanleitung

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CobraNet
TM
Routing Primer
Steve Gray, Cirrus Logic, Inc.
Configuring CobraNet
TM
systems to properly route audio is fairly straightforward once the underlying
concepts are understood. This document explains the concepts behind end to end routing and how to
configure CobraNet
TM
interfaces to route audio channels. Use this document as a companion to the available
CobraNet
TM
device Data Sheets and Reference Manuals.
The variables referred to in this document are described in the CobraNet
TM
Programmer’s Reference. They
are known as Management Interface (MI) variables and can be read and written via the hardware Host
Management Interface (HMI) or via SNMP over the network.
The signals referred to are described in the Datasheet or Hardware Reference Manual applicable to the
particular CobraNet
TM
interface in use.
Referring to Figure 1 below, let’s consider the components of CobraNet
TM
audio routing.
Fig. 1 Simplified Routing Schematic
CobraNet
TM
Audio Routing Primer Rev. 1.2 ©Copyright 2004 Cirrus Logic, Inc
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Inhaltsverzeichnis

Seite 1

CobraNetTM Routing Primer Steve Gray, Cirrus Logic, Inc. Configuring CobraNetTM systems to properly route audio is fairly straightforward once the u

Seite 2

Components of Routing Bundles A Bundle is the basic unit of data for transporting audio over a CobraNetTM network and can contain from zero to eight

Seite 3

Bundle to Audio Routing Channel Mapping – txSubMap and rxSubMap The RxSubMap and TxSubMap variable arrays are used to map Audio Routing Channels to

Seite 4 - Additional Information

Example: We have two standard CM-2 modules to be configured as a transmitter and a receiver. We want to send the audio data with standard latency, a

Seite 5

Appendix A - MI Variables used in routing Refer to the CobraNetTM Programmer’s Reference for more detailed information on these variables. txBundl

Seite 6

modeRateControl: Must be set the same on both the sending and receiving interfaces. There is one modeRateControl variable per CobraNetTM interface

Seite 7

Appendix B – SSI Interface Theory There are typically four Synchronous Serial Interfaces in a CobraNetTM interface. This number can differ depending

Seite 8

Appendix C – Default SSI to Audio Routing Channel Mapping 2 x 2 Interface SSI Interface SSI Timeslice Audio Routing Channel (Receive) Audio Routin

Seite 9 - 32 x 32 Interface

CobraNetTM Audio Routing Primer Rev. 1.2 ©Copyright 2004 Cirrus Logic, Inc Page 9 of 9 Appendix B – continued 32 x 32

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