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2 AN333

1 Document Strategy

The CS470xx has been designed with inherently flexibility in terms of firmware usage. Each instance of operation of the

CS470xx can potentially use a different mix of DSP firmware, depending on the needs of the end user. The strategy

adopted to document the various DSP firmware is based on a single general overview firmware user’s manual coupled

with an individual application note for each DSP firmware module offered by Cirrus Logic.

The individual application notes each follow as an extension of AN333. These manuals have been named in such a way

so as to classify them into one of the following categories:

• Operating system and general overview

• Matrix processing module (MPM)

• Virtual processing module (VPM)

• Post-processing module (PPM)

Furthermore, since each classification (such as post-processing module) may contain several associated DSP firmware

modules, an incremental letter assignment (such as A, B, C) was given to index each DSP firmware document within a

given category. As an example, the table below outlines the general naming conventions for several firmware documents.

For a further breakdown of the available CS470xx firmware modules and their respective application note document

numbers, see Section 2.3. Contact your local field applications engineer (FAE) for the latest code updates and availability.

Table 1-1. Naming Conventions

DSP Firmware Module Base Name Overlay Type Index Document Reference Number

General Overview, Operating System

and Common Firmware Modules

AN333 (General) — AN333

Delay Module AN333 Post Processing Module (PPM) a AN333PPMA

Crossbar Mixer Module AN333 Matrix Processing Module (MPM) c AN333MPMC

Dolby Headphone 2 AN333 Virtual Processing Module (VPM) a AN333VPMA

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