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CS48540-CQZ Arkusz danych(PDF) 6 Page - Cirrus Logic |
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CS48540-CQZ Arkusz danych(HTML) 6 Page - Cirrus Logic |
6 / 23 page 6 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™/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 (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 Framework™ modules 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 |
Podobny numer części - CS48540-CQZ |
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Podobny opis - CS48540-CQZ |
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