Cirrus-logic CS48DV2B User Manual download pdf (Page 7)

CS48DV2B Data Sheet

32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby

CONFIDENTIAL

CONFIDENTI

DRA

DELP

4. Hardware Functional Description

4.1 DSP Core

The CS48DV2B 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.

CS48DV2B functionality is controlled by application codes that are stored in on-board ROM or

downloaded to the CS48DV2B 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 CS48DV2B 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 CS48DV2B 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.

4.1.2 DMA Controller

The powerful 8-channel DMA controller can move data between 8 on-chip resources. Each resource

has its own arbiter: X, Y, and P RAMs/ROMs and the peripheral bus. Modulo and linear addressing

Table 2. Device and Firmware Selection Guide

Devices Availability Suggested Applications Specific Features

CS48DV2B-CQZ

CS48DV2B-DQZ

In Production Now

• Digital TV

Portable Audio

Docking Station

• Portable DVD

Players

• Multimedia PC

Speakers

• Soundbars

• Automotive

Entertainment

Systems

• 2.1 channels of audio

input and 2.1

channels of PCM

audio output.

• 512 FFT Window, 20-

Bands/Channel

• Dolby Volume Native

Processing of the

following Fs:

— 32 kHz

— 44.1 kHz

— 48 kHz

1 2 3 4 5 6 7 8 9 10 11 12 ... 25 26

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Cirrus-logic CS48DV2B User Manual Page 7

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