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CS48540-DQZ датащи(PDF) 7 Page - Cirrus Logic

номер детали CS48540-DQZ
подробное описание детали  32-bit Audio Decoder DSP Family
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS485xx Family Data Sheet
32-bit Audio Decoder DSP Family
DS734F3
Copyright 2009 Cirrus Logic, Inc.
7
CONFIDENTIAL
4. Hardware Functional Description
4.1 DSP Core
The CS485xx family DSPs are single-core DSP with separate X and Y data and P code memory
spaces. The DSP core is a high-performance, 32-bit, user-programmable, fixed-point DSP that is
capable of performing two multiply-and-accumulate (MAC) operations per clock cycle. The DSP core
has eight 72-bit accumulators, four X- and four Y-data registers, and 12 index registers.
The DSP core is coupled to a flexible DMA engine. The DMA engine can move data between
peripherals such as the serial control port (SCP), digital audio input (DAI) and digital audio output
(DAO), or any DSP core memory, all without the intervention of the DSP. The DMA engine off loads
data move instructions from the DSP core, leaving more MIPS available for signal processing
instructions.
CS485xx family functionality is controlled by application codes that are stored in on-board ROM or
downloaded to the CS485xx from a host controller or external serial FLASH/EEPROM.
Users can develop their applications using DSP Composer to create the processing chain and then
compile the image into a series of commands that are sent to the CS485xx through the SCP. The
processing application can either load modules (matrix-processors, virtualizers, post-processors)
from the DSPs on-board ROM, or custom firmware can be downloaded through the SCP.
The CS485xx is suitable for a variety of audio post-processing applications such as automotive
head-ends, automotive amplifiers, and boom boxes.
4.1.1 DSP Memory
The DSP core has its own on-chip data and program RAM and ROM and does not require external
memory for post-processing applications.
The Y-RAM and P-RAM share a single block of memory that can be configured to make Y and P
equal in size, or more memory can be allocated for Y-RAM in 2kword blocks.
Table 2. 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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