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參數(shù)資料
| 型號： | CS48DV2B-CQZR |
| 廠商： | Cirrus Logic Inc |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP AUDIO 32BIT 2CH 48-LQFP |
| 標準包裝： | 2,000 |
| 系列： | CS48DV2 |
| 類型： | 定點 |
| 接口： | I²C，SPI |
| 時鐘速率： | 150MHz |
| 電壓 - 輸入/輸出： | 3.30V |
| 電壓 - 核心： | 1.80V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應商設備封裝： | 48-LQFP（7x7） |
| 包裝： | 帶卷 (TR) |
CS48DV2B Data Sheet
32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby
6
Copyright 2009 Cirrus Logic
DS875F2
CONFIDENTIAL
CONFIDENTI
A
L
DRA
FT
D
ELPHI
3. Code Overlays
The suite of software available for the CS48DV2B DSP 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 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 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 the Dolby Volume and Audistry by Dolby
firmware, bass management, audio manager, tone control, EQ, delay, and customer-specific
effects
The bulk of each overlay is stored in ROM within the CS48DV2B, 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. This fact is also true for the other overlays.
Table 2 lists the firmware available based on device selection. Please refer to AN298, CS485xx
Firmware User’s Manual for the latest listing of application codes and Cirrus Framework modules
available.
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