CS48540-CQZ Cirrus Logic Inc, CS48540-CQZ Datasheet - Page 6

• Manufacturer Part Number: CS48540-CQZ
• Description: Audio DSPs High Perform. 32-Bit Audio Decoder DSP
• Manufacturer: Cirrus Logic Inc

Specifications of CS48540-CQZ

• Operating Supply Voltage: 1.8 V
• Mounting Style: SMD/SMT
• Package / Case: LQFP-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CS485xx Family Data Sheet
32-bit Audio Decoder DSP Family
3. Code Overlays
6
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:
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
requested. Each overlay can be reloaded independently without disturbing the other overlays. For
example,
need to be reloaded — only the new matrix-processor (the same is true for the other overlays).
Firmware User’s Manual for the latest listing of application codes and Cirrus Framework
available.
The suite of software available for the CS485xx family consists of an operating system (OS) and a
The bulk of each overlay is stored in ROM within the CS485xx, but a small image is required to
The overlay structure reduces the time required to reconfigure the DSP when a processing change is
Table 2
2. Matrix-processor- Any Module that performs a matrix decode on PCM data to produce more
3. Virtualizer-processor - Any module that encodes PCM data into fewer output channels than
4. Post-processors - Any module that processes audio I/O buffer PCM data in-place after the
1. OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external
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.
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
Virtual Speaker
audio I/O buffer.
matrix- or virtualizer-processors. Examples are bass management, audio manager, tone control,
EQ, delay, customer-specific effects, etc.
memory, processing host messages, calling audio-processing subroutines, error concealment,
etc.
below lists the firmware available based on device selection. Please refer AN298, CS485xx
when a new matrix-processor is selected, the OS, virtualizer-, and post-processors do not
®
. Generally speaking, these modules reduce the number of valid channels in the
Copyright 2009 Cirrus Logic, Inc.
CONFIDENTIAL
SPI
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/I
2
C
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serial port.
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and Dolby
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modules
DS734F3