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CS48DV2B-CQZ Datasheet(PDF) 6 Page - Cirrus Logic |
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CS48DV2B-CQZ Datasheet(HTML) 6 Page - Cirrus Logic |
6 / 26 page CS48DV2B Data Sheet 32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby 6 Copyright 2009 Cirrus Logic DS875F2 CONFIDENTIAL 3. Code Overlays The suite of software available for the CS48DV2B DSP consists of an operating system (OS) and a library of overlays. The overlays have been divided into three main groups called Matrix-processors, Virtualizer-processors, and Post-processors. All software components are defined below: 1. OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external memory, processing host messages, calling audio-processing subroutines, error concealment, etc. 2. Matrix-processor- Any Module that performs a matrix decode on PCM data to produce more output channels than input channels (2 n channels). Examples are Dolby® Pro Logic® IIx and DTS Neo:6™. Generally speaking, these modules increase the number of valid channels in the audio I/O buffer. 3. Virtualizer-processor - Any module that encodes PCM data into fewer output channels than input channels (n 2 channels) with the effect of providing “phantom” speakers to represent the physical audio channels that were eliminated. Examples are Dolby Headphone® and Dolby® Virtual Speaker®. Generally speaking, these modules reduce the number of valid channels in the audio I/O buffer. 4. Post-processors - Any module that processes audio I/O buffer PCM data in-place after the matrix- or virtualizer-processors. Examples are the Dolby Volume and Audistry by Dolby firmware, bass management, audio manager, tone control, EQ, delay, and customer-specific effects The bulk of each overlay is stored in ROM within the CS48DV2B, but a small image is required to configure the overlays and boot the DSP. This small image can either be stored in an external serial FLASH/EEPROM, or downloaded via a host controller through the SPI™/I2C® serial port. The overlay structure reduces the time required to reconfigure the DSP when a processing change is requested. Each overlay can be reloaded independently without disturbing the other overlays. For example, when a new matrix-processor is selected, the OS, virtualizer-, and post-processors do not need to be reloaded — only the new matrix-processor. This fact is also true for the other overlays. Table 2 lists the firmware available based on device selection. Please refer to AN298, CS485xx Firmware User’s Manual for the latest listing of application codes and Cirrus Framework™ modules available. |
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