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Cirrus Logic CobraNet

Developer Tips for

CS1810xx / CS4961xx Devices

1. INTRODUCTION

This document contains a compendium of information useful in the development of products based on the Cirrus

Logic CS1810xx and CS4961xx CobraNet

devices. It is intended as an initial guideline for hardware and software

engineers, which are new to the development of designs using CobraNet devices.

The information required for product development is also contained in various application notes, data sheets and

manuals available on the Cirrus Logic and CobraMC websites.

The CobraMC website is a password protected site which provides support for CobraNet OEMs. Access to this site

is provided to qualified customers upon execution of a standard non-disclosure agreement (NDA) with Cirrus Logic.

Please contact your local Cirrus Logic distributor or sales representative in order to execute an NDA and gain access

to this site and any other protected materials described in this document.

1.1 Required References

It is compulsory to obtain and study the following references:

1. CobraNet Programmer's Reference Manual - Contains information on the control and setup of Co-

braNet devices. Most of the manual is a reference describing each of the configuration variables used

to control and monitor a CobraNet interface.

2. CobraNet Hardware User's Guide - This is the data sheet for the CS181xx/CS4961xx chips. It con-

tains a schematic for the CM-2 CobraNet module which can be used as a reference design.

3. CobraNet Discovery User's Manual - This manual is installed with CobraNet Discovery. CobraNet

Discovery is an application used to monitor and control CobraNet devices and to update the firmware

of CobraNet devices.

4. Application Notes:

a. CobraNet Audio Routing Primer — Basic information about setting bundle numbers and channel

assignments

b. Bundle Assignments in CobraNet Systems — Considerations and guidelines when setting up

audio bundles in a CobraNet installation. Ramifications of different settings and how they impact

network performance and utilization.

c. Integrating CobraNet into Audio Products — Basic hardware design guidelines for CobraNet

products. Much is focused on integrating CobraNet modules into audio equipment but a wealth of

applicable information of a general nature and pertaining to chips is contained here.

d. AN312, CobraNet Clocking Modes — This application note is required for any manufacturer that

intends to use any clocking mode other than the default. Proper use and support of CobraNet audio

clocks is essential to correct operation of the individual devices and the audio network.

e. AN279, Controlling and Monitoring DSP Conductor™ Configurations — This application note

describes how to access the R/W variables used to control the DSP parameters created with DSP

Conductor.

f. AN334, CS1810xx / CS4961xx Bing-up Instructions — This application note describes how to

get a newly manufactured CobraNet design up and running using either a pre-programmed flash or

debugging tools.

AN335

NOVEMBER '08

AN335REV1

1 2 3 4 5 6 7 8 9 10

Inhaltsverzeichnis

Seite 1 - CS1810xx / CS4961xx Devices

Seite 2 - 3. FIRMWARE

10 AN335REV1AN335Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one neare

Seite 3

2 AN335REV1AN3352. CobraNet DISCOVERYThe CobraNet Discovery Software (also referred to as 'Disco') should be downloaded and installed. Disco

Seite 4 - 4. FIRMWARE CUSTOMIZATION

AN335REV1 3AN3351. The latest version of CobraNet firmware is available on the Cirrus Logic website or on the CobraMCwebsite.http://www.cirrus.com — P

Seite 5 - 7. DSP CONDUCTOR™

4 AN335REV1AN3354. FIRMWARE CUSTOMIZATIONCNCustom is a program available to qualified manufacturer's which is used to create firmware binary imag

Seite 6

AN335REV1 5AN3356. MAC ADDRESSES• Each CobraNet device must be assigned a unique MAC address. Cirrus Logic provides a Python scriptthat is used to ass

Seite 7 - 9.3 CS18102/CS49612

6 AN335REV1AN335which is required to operate in slave mode. – The CM-2 provides a LRCK signal at 48 kHz (Sampling Rate or Fs) to an external audio sou

Seite 8 - - 2 timeslots/cycle

AN335REV1 7AN3359. CobraNet SILICON SERIES DEVICE DIFFERENCESThe CS18100, CS18101, CS18102, CS49610, CS49611 and CS49612 are members of the Cirrus Log

Seite 9

8 AN335REV1AN335Figure 1. Normal Mode TimingFigure 2. Audio Clock Connections1 21 2 3 4Mode B - 4 timeslots/cycleMode A - 2 timeslots/cycleFS1 - Bo

Seite 10 - 10 AN335REV1

AN335REV1 9AN33510.DIFFERENCES BETWEEN CM-A AND CM-2 INTERFACESDetailed information on the points referred to here are available in the CobraNet Progr

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