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CS47048C-DQZ датащи(PDF) 7 Page - Cirrus Logic |
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CS47048C-DQZ датащи(HTML) 7 Page - Cirrus Logic |
7 / 40 page 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™/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 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 Framework™ modules 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. |
Аналогичный номер детали - CS47048C-DQZ |
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Аналогичное описание - CS47048C-DQZ |
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