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CS48540-CQZ Arkusz danych(PDF) 6 Page - Cirrus Logic

Numer części CS48540-CQZ
Szczegółowy opis  Cost-effective, High-performance 32-bit DSP
Download  23 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS48540-CQZ Arkusz danych(HTML) 6 Page - Cirrus Logic

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DS734F5
3 Code Overlays
3 Code Overlays
The suite of software available for the CS485xx family 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 ProLogic 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 bass management, audio manager, tone control, EQ, delay,
customer-specific effects, etc.
The bulk of each overlay is stored in ROM within the CS485xx, 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 new matrix-processor
is selected, the OS, virtualizer-, and post-processors do not need to be reloaded — only the new matrix-processor (the
same is true for the other overlays).
Table 3-1 lists the firmware available based on device selection. Refer AN298, CS485xx Firmware User’s
Manual for the latest listing of application codes and Cirrus Frameworkmodules available.
Table 3-1. Device and Firmware Selection Guide
Device
Suggested Application
Channel Count Input/Output
Package
CS48520-CQZ Digital TV, portable audio docking station, portable DVD, DVD mini/
receiver, multimedia PC speakers
Up to 4-channel in/4-channel out
48-pin QFP
CS48540-CQZ
CS48540-DQZ
CS48520 features plus 8-channel car audio, DVD receiver
Up to 8-channel in/8-channel out
48-pin QFP
CS48560-CQZ
CS48560-DQZ
CS48540 features plus 12-channel car audio, high-end digital TV, dual
source/dual zone SACD
Up to 12-channel in/12-channel out
48-pin QFP


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