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CS1810xx / CS4961xx Bring-up Instructions

1. INTRODUCTION

CobraNet

firmware is stored in external FLASH memory which must be programmed before the CobraNet device

can become operational.

Once an initial firmware load of the FLASH is accomplished, the device will be functional. All subsequent firmware

updates can be accomplished via the network, using Cirrus-supplied tools such as CobraNet Discovery or the Py-

thon-based manufacturing script.

There are two means for accomplishing this initial firmware load:

• Use of pre-programmed FLASH

• Use of the CID debug interface tool

1.1 Pre-Programmed Flash Device

The simplest and most efficient approach, especially for volume production, is to pre-program the FLASH

memory before it is soldered to the circuit board.

CobraNet firmware is delivered as a 1M byte binary file (example: cm18101_2_11_6.bin). The latest firm-

ware may be downloaded from the Cirrus Logic web site at http://www.cirrus.com. The firmware binary file

is an exact image of FLASH contents required to boot and operate the CobraNet chip.

A properly constructed CobraNet interface populated with a pre-programmed FLASH will, without interven-

tion, boot and function properly from initial power-up.

It is recommended that the initial firmware image to be used is the cs18100_2_11.x.bin firmware file. This

is the lowest common denominator firmware and will provide proper network functionality in ALL CobraNet-

chip-based platforms. A manufacturer can then stock only one pre-programmed chip type and then, later,

update specifically required firmware variants during the manufacturing process. FLASH will always need

to be reprogrammed in any case as part of the MAC address assignment process.

1.2 I²C

Interface

The chip also features an I²C

interface. Use of the I²C port for device bring-up requires use of:

• I²C/Parallel interface adapter.

• Personal Computer

• CID software

• CobraNet Discovery Software

The software noted above is bundled with this document and can also be downloaded from the Cirrus Logic

web site. The interface adapter can be constructed from the schematic included in this document or can be

supplied by Cirrus Logic to qualified manufacturers.

Details on using the I²C interface and support software (CID) are provided in the “I²C Interface and Software”

section.

Use of the I²C interface to load firmware is a two-step process. CID is used to load and run a base version

of firmware in volatile RAM. Once running from RAM and operational on the network, either CobraNet Dis-

covery or the Python manufacturing script must be used to permanently load the FLASH memory with the

most current firmware version.

AN334

NOVEMBER '08

AN334REV1

1 2 3 4 5 6

Résumé du contenu

Page 1 - 1. INTRODUCTION

Page 2 - 3. I²C INTERFACE AND SOFTWARE

2 AN334REV1AN3342. HARDWARE DIAGNOSTICSThe standard firmware includes a boot-up routine that performs a Power On Self Test (POST). POST tests internal

Page 3 - 4. DEBUGGING THE HARDWARE

AN334REV1 3AN334For target systems that do not use the standard I²C pin-out of the CM-2, I²C adaptor signals are describedin Table 1 and shown in the

Page 4 - 7. DISABLING THE BOOT PROCESS

4 AN334REV1AN3345. MAC ADDRESSThe line 0x1ff0: 0x6000ff2b 0x00ff0000 shows the MAC address. The MAC address is stored in a sectionof the flash memory

Page 5 - Figure 2. CID Adapter

Page 6 - 6 AN334REV1

6 AN334REV1AN334Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one neares

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Cirrus-logic AN334 Manuel d'utilisateur

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