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CS47028C-DQZ 데이터시트(PDF) 7 Page - Cirrus Logic

부품명 CS47028C-DQZ
상세설명  Audio SOC Processor Family
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
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CS470xx Data Sheet
Audio SOC Processor Family
DS787PP1
Copyright 2009 Cirrus Logic
7
3. Code Overlays
The suite of software available for the CS470xx family consists of an operating system (OS) and a
library of overlays. The software components for the CS470xx family include:
1. OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external
serial 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® 2 and Dolby®
Virtual Speaker® 2. 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. Examples are bass
management, audio manager, tone control, EQ, delay, customer-specific effects, and any post-
processing algorithms available for the CS485xx DSP.
The bulk of standard overlays are stored in ROM within the CS470xx, 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™/I2Cserial 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 different post-processor is selected, the OS, does not need to be reloaded —
only the new post-processor.
Table 2 lists the different configuration options available. Please refer to the CS470xx Firmware
User’s Manual for the latest listing of application codes and Cirrus Frameworkmodules available.
See Table 3 which provides a summary of the available channels for each type of input and output
communication mode for members of the CS470xx family of DSPs.


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