Moteur de recherche de fiches techniques de composants électroniques |
|
CS497014 Fiches technique(PDF) 6 Page - Cirrus Logic |
|
CS497014 Fiches technique(HTML) 6 Page - Cirrus Logic |
6 / 31 page CS4970x4 Data Sheet 32-bit High Definition Audio Decoder DSP Family DS752F1 6 • OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external memory, processing host messages, calling audio-processing subroutines, auto-detection, error concealment, etc. • Decoders - Any module that initially writes data into the audio I/O buffers, e.g. AC-3™, DTS, PCM, etc. All the decoding/processing algorithms listed require delivery of PCM or IEC61937-packed, compressed data via I2S- or LJ-formatted digital audio to the CS4970x4 from A/D converters, SPDIF Rx, HDMI Rx, etc. • Matrix-processors - Any module that processes audio I/O buffer PCM data in-place before the Post- processors. Generally speaking, these modules alter the number of valid channels in the audio I/O buffer through processes like Virtualization (n 2 channels) or Matrix Decoding (2n channels). Examples are Dolby ProLogic IIx and DTS Neo:6. • 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. • Post-processors - Any module that processes audio I/O buffer PCM data in-place after the matrix processors. Examples are bass management, audio manager, tone control, EQ, delay, customer-specific effects, Dolby Headphone/Virtual Speaker, etc. 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 decoder is selected, the OS, matrix-, and post-processors do not need to be reloaded — only the new decoder (the same is true for the other overlays). 4 Hardware Functional Description 4.1 Coyote DSP Core The CS4970x4 is a dual-core Coyote DSP with separate X and Y data and P code memory spaces. Each core is a high-performance, 32-bit, user-programmable, fixed-point DSP that is capable of performing two multiply accumulate (MAC) operations per clock cycle. Each core has eight 72-bit accumulators, four X- and four Y-data registers, and 12 index registers. Both DSP cores are coupled to a flexible DMA engine. The DMA engine can move data between peripherals such as the digital audio input (DAI) and digital audio output (DAO), external memory, or any DSP core memory, all without the intervention of the DSP. The DMA engine offloads data move instructions from the DSP core, leaving more MIPS available for signal processing instructions. CS4970x4 functionality is controlled by application codes that are stored in on-board ROM or downloaded to the CS4970x4 from a host MCU or external FLASH/EEPROM. Users can choose to use standard audio decoder and post-processor modules which are available from Cirrus Logic. The CS4970x4 is suitable for audio decoder, audio post-processor, audio encoder, DVD audio/video player, and digital broadcast decoder applications. 4.1.1 DSP Memory Each DSP core has its own on-chip data and program RAM and ROM and does not require external memory for any of today’s popular audio algorithms including Dolby Digital Surround EX, AAC Multichannel, DTS-ES 96/24, and THX Ultra2. However, if the end-system design requires support of the new high-definition audio formats, external SDRAM will be needed to support Dolby TrueHD and DTS-HD master audio. The memory maps for the DSPs are as follows. All memory sizes are composed of 32-bit words. |
Numéro de pièce similaire - CS497014 |
|
Description similaire - CS497014 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |