Analog Devices Blackfin Audio EZ-Extender User manual

a
Blackfin®Audio
EZ-Extender®Manual
Revision 2.2, July 2012
Part Number
82-000195-01
Analog Devices, Inc.
One Technology Way
Norwood, Mass. 02062-9106

Copyright Information
© 2012 Analog Devices, Inc., ALL RIGHTS RESERVED. This docu-
ment may not be reproduced in any form without prior, express written
consent from Analog Devices, Inc.
Printed in the USA.
Disclaimer
Analog Devices, Inc. reserves the right to change this product without
prior notice. Information furnished by Analog Devices is believed to be
accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use; nor for any infringement of patents or other rights of
third parties which may result from its use. No license is granted by impli-
cation or otherwise under the patent rights of Analog Devices, Inc.
Trademark and Service Mark Notice
The Analog Devices logo, Blackfin, CrossCore, EngineerZone,
EZ-Extender, EZ-KIT Lite, and VisualDSP++ are registered trademarks of
Analog Devices, Inc.
All other brand and product names are trademarks or service marks of
their respective owners.

Regulatory Compliance
The Blackfin Audio EZ-Extender is designed to be used solely in a labora-
tory environment. The board is not intended for use as a consumer end
product or as a portion of a consumer end product. The board is an open
system design which does not include a shielded enclosure and therefore
may cause interference to other electrical devices in close proximity. This
board should not be used in or near any medical equipment or RF devices.
The Blackfin Audio EZ-Extender has been certified to comply with the
essential requirements of the European EMC directive 89/336/EEC
(inclusive 93/68/EEC) and, therefore, carries the “CE” mark.
The Blackfin Audio EZ-Extender has been appended to Analog Devices,
Inc. EMC Technical File (EMC TF) referenced ‘DSPTOOLS1’ dated
December 21, 1997 and was declared CE compliant by an appointed
Notified Body (No.0673) as listed below.
Notified Body Statement of Compliance: Z600ANA1.024
Issued by: Technology International (Europe) Limited
56 Shrivenham Hundred Business Park
Shrivenham, Swindon, SN6 8TY, UK
The Blackfin Audio EZ-Extender contains ESD (electrostatic discharge)
sensitive devices. Electrostatic charges readily accumulate on the human
body and equipment and can discharge without detection. Permanent
damage may occur on devices subjected to high-energy discharges. Proper
ESD precautions are recommended to avoid performance degradation or
loss of functionality. Store unused extender boards in the protective ship-
ping package.

Blackfin Audio EZ-Extender Manual v
CONTENTS
PREFACE
Product Overview ....................................................................... viii
Purpose of This Manual ............................................................... ix
Intended Audience ........................................................................ ix
Manual Contents ........................................................................... x
What’s New in This Manual ........................................................... x
Technical Support ......................................................................... xi
Supported Products ...................................................................... xii
Product Information .................................................................... xii
Analog Devices Web Site ........................................................ xii
EngineerZone ........................................................................ xiii
Related Documents ...................................................................... xiv
BLACKFIN AUDIO EZ-EXTENDER INTERFACES
Audio EZ-Extender Setup ............................................................. 1-1
Analog Audio Interface .................................................................. 1-2
Digital Audio Interface .................................................................. 1-4

Contents
vi Blackfin Audio EZ-Extender Manual
AUDIO EZ-EXTENDER HARDWARE REFERENCE
System Architecture ...................................................................... 2-2
Configuration Jumpers and Switches ............................................. 2-4
ADSP-BF537 EZ-KIT Lite Select Jumper (JP1.1/2) ................. 2-5
EZ-KIT Lite SPORT0 Enable Jumper (JP1.3/4) ...................... 2-6
EZ-KIT Lite SPORT1 Enable Jumper (JP1.5/6) ...................... 2-6
SPORT Select Jumper (JP1.7/8) .............................................. 2-6
AD1938 MCLK Source Jumper (JP2) ...................................... 2-6
SPDIF Loopback Jumper (JP4) ............................................... 2-7
Analog Input Gain Switches (SW1–4) ..................................... 2-7
AUDIO EZ-EXTENDER BILL OF MATERIALS
AUDIO EZ-EXTENDER SCHEMATIC
INDEX

Blackfin Audio EZ-Extender Manual vii
PREFACE
Thank you for purchasing the Blackfin®Audio EZ-Extender®, Analog
Devices, Inc. daughter board to the EZ-KIT Lite®evaluation system for
the ADSP-BF533, ADSP-BF537, and ADSP-BF561 Blackfin processors.
Blackfin processors are embedded processors that support a Media
Instruction Set Computing (MISC) architecture. This architecture is the
natural merging of RISC, media functions, and digital signal processing
characteristics towards delivering signal processing performance in a
microprocessor-like environment.
EZ-KIT Lites and Audio EZ-Extenders are designed to be used in con-
junction with the CrossCore®Embedded Studio (CCES) and
VisualDSP++®software development environments. The development
environment facilitates advanced application code development and
debug, such as:
• Create, compile, assemble, and link application programs written
in C++, C, and Audio EZ-Extender assembly
• Load, run, step, halt, and set breakpoints in application programs
• Read and write data and program memory
• Read and write core and peripheral registers
• Plot memory
To learn more about Analog Devices development software, go to
http://www.analog.com/processors/tools.

Product Overview
viii Blackfin Audio EZ-Extender Manual
Product Overview
The Blackfin Audio EZ-Extender is a separately sold daughter board that
plugs onto the expansion interface of the ADSP-BF533, ADSP-BF537, or
ADSP-BF561 EZ-KIT Lite evaluation system. The daughter board aids
the design and prototyping phases of the ADSP-BF533, ADSP-BF537,
and ADSP-BF561 processor targeted applications.
Please visit www.analog.com/EX1-Audio for additional information,
including CCES support.
The board extends the capabilities of the evaluation system by providing a
connection to audio codecs, including two analog audio codecs and one
dual analog/digital audio codec with an interface to digital Sony Philips
Digital Interface (SPDIF) audio.
The following is a list of the Blackfin Audio EZ-Extender interfaces.
• Analog audio interface
• AD1938 – Analog Devices 192 kHz audio codecs
• Four stereo analog audio inputs via RCA jacks
• Eight stereo analog audio outputs via RCA jacks
• Digital audio interface
One ADAV801 – Analog Devices SPDIF transceiver with sample
rate converter
• One SPDIF input via an RCA jack
• One SPDIF output via an RCA jack
• Expansion interface on both sides of the board for stacking other
EZ-Extender boards

Blackfin Audio EZ-Extender Manual ix
Preface
Before using any of the interfaces, follow the setup procedure in “Audio
EZ-Extender Setup” on page 1-1.
Example programs are available to demonstrate capabilities of the Blackfin
Audio EZ-Extender board.
Purpose of This Manual
The Blackfin Audio EZ-Extender Manual describes operation and configu-
ration of the extender board components. A schematic and a bill of
materials are provided as a reference guide for future Blackfin processor
board designs.
Intended Audience
This manual is a user’s guide and reference to the Blackfin Audio
EZ-Extender. Programmers who are familiar with the Analog Devices
Blackfin processor architecture, operation, and development tools are the
primary audience for this manual.
Programmers who are unfamiliar with Analog Devices processors can use
this manual but should supplement it with other texts that describe your
target architecture. For the locations of these documents, see “Related
Documents”.
Programmers who are unfamiliar with CCES or VisualDSP++ should refer
to the online help and user’s manuals.

Manual Contents
x Blackfin Audio EZ-Extender Manual
Manual Contents
The manual consists of:
• Chapter 1, “Blackfin Audio EZ-Extender Interfaces” on page 1-1
Provides basic board information.
• Chapter 2, “Audio EZ-Extender Hardware Reference” on page 2-1
Provides information on the hardware aspects of the board.
• Appendix A, “Audio EZ-Extender Bill Of Materials” on page A-1
Provides a list of components used to manufacture the
EZ-Extender board.
• Appendix B, “Audio EZ-Extender Schematic” on page B-1
Provides the resources to allow EZ-KIT Lite board-level debugging
or to use as a reference guide. Appendix B is part of the online help.
What’s New in This Manual
This is revision 2.2 of the Blackfin Audio EZ-Extender Manual. The man-
ual has been updated to include CCES information. In addition,
modifications and corrections based on errata reports against the previous
manual revision have been made.
For the latest version of this manual, please refer to the Analog Devices
Web site.

Blackfin Audio EZ-Extender Manual xi
Preface
Technical Support
You can reach Analog Devices processors and DSP technical support in
the following ways:
• Post your questions in the processors and DSP support community
at EngineerZone®:
http://ez.analog.com/community/dsp
• Submit your questions to technical support directly at:
http://www.analog.com/support
• E-mail your questions about processors, DSPs, and tools develop-
ment software from CrossCore Embedded Studio or
VisualDSP++:
Choose Help > Email Support. This creates an e-mail to
[email protected] and automatically attaches
your CrossCore Embedded Studio or VisualDSP++ version infor-
mation and license.dat file.
• E-mail your questions about processors and processor applications
to:
[email protected] or
[email protected] (Greater China support)
•IntheUSA only, call 1-800-ANALOGD (1-800-262-5643)
• Contact your Analog Devices sales office or authorized distributor.
Locate one at:
www.analog.com/adi-sales

Supported Products
xii Blackfin Audio EZ-Extender Manual
• Send questions by mail to:
Processors and DSP Technical Support
Analog Devices, Inc.
Three Technology Way
P.O. Box 9106
Norwood, MA 02062-9106
USA
Supported Products
The Blackfin Audio EZ-Extender is designed as an extender board to the
ADSP-BF533, ADSP-BF537, and ADSP-BF561 EZ-KIT Lite evaluation
systems.
Product Information
Product information can be obtained from the Analog Devices Web site
and the online help.
Analog Devices Web Site
The Analog Devices Web site, www.analog.com, provides information
about a broad range of products—analog integrated circuits, amplifiers,
converters, and digital signal processors.
To access a complete technical library for each processor family, go to
http://www.analog.com/processors/technical_library. The manuals
selection opens a list of current manuals related to the product as well as a
link to the previous revisions of the manuals. When locating your manual
title, note a possible errata check mark next to the title that leads to the
current correction report against the manual.

Blackfin Audio EZ-Extender Manual xiii
Preface
Also note, MyAnalog is a free feature of the Analog Devices Web site that
allows customization of a Web page to display only the latest information
about products you are interested in. You can choose to receive weekly
e-mail notifications containing updates to the Web pages that meet your
interests, including documentation errata against all manuals. MyAnalog
provides access to books, application notes, data sheets, code examples,
and more.
Visit MyAnalog to sign up. If you are a registered user, just log on. Your
user name is your e-mail address.
EngineerZone
EngineerZone is a technical support forum from Analog Devices. It allows
you direct access to ADI technical support engineers. You can search
FAQs and technical information to get quick answers to your embedded
processing and DSP design questions.
Use EngineerZone to connect with other DSP developers who face similar
design challenges. You can also use this open forum to share knowledge
and collaborate with the ADI support team and your peers. Visit
http://ez.analog.com to sign up.

Related Documents
xiv Blackfin Audio EZ-Extender Manual
Related Documents
For additional information about the product, refer to the following
publications.
Table 1. Related Processor Publications
Title Description
•ADSP-BF531/ADSP-BF532/ADSP-BF533
Blackfin Embedded Processor Data Sheet
•ADSP-BF534/ADSP-BF536/ADSP-BF537
Blackfin Embedded Processor Data Sheet
•ADSP-BF561 Blackfin Embedded Symmetric
Multiprocessor Data Sheet
General functional description, pinout, and
timing
•ADSP-BF533 Blackfin Processor Hardware
Reference
•ADSP-BF537 Blackfin Processor Hardware
Reference
•ADSP-BF561 Blackfin Processor Hardware
Reference
Description of the internal processor architec-
ture and all register functions
Blackfin Processor Programming Reference Description of all allowed processor assembly
instructions

Blackfin Audio EZ-Extender Manual 1-1
1 BLACKFIN AUDIO
EZ-EXTENDER INTERFACES
This chapter provides the Blackfin Audio EZ-Extender setup procedure
and describes two types of interfaces the extender supports.
The information is presented in the following order.
•“Audio EZ-Extender Setup” on page 1-1
•“Analog Audio Interface” on page 1-2
•“Digital Audio Interface” on page 1-4
Audio EZ-Extender Setup
It is very important to set up all components of the system containing the
Blackfin Audio EZ-Extender, then apply power to the system. The follow-
ing procedure is recommended for the correct setup.

Analog Audio Interface
1-2 Blackfin Audio EZ-Extender Manual
Power your system after these steps are completed:
1. Read the applicable design interface section in this chapter—the
text provides an overview of the interface capabilities.
2. Read “System Architecture” on page 2-2 to understand the physical
connections of the daughter board. For detailed information, refer
to “Audio EZ-Extender Schematic” on page B-1.
3. Refer to the readme text files in the Examples folder of the installa-
tion directory for information on how to configure both the Audio
EZ-Extender and EZ-KIT Lite boards. For custom setups, use
“System Architecture” on page 2-2 in conjunction with “Configu-
ration Jumpers and Switches” on page 2-4.
Analog Audio Interface
For analog audio applications, the Blackfin Audio EZ-Extender uses two
AD1938 multichannel 192 kHz audio codecs.
The AD1938 is a high-performance, single-chip codec chip that provides
four analog-to-digital converters (ADCs) with differential inputs and eight
digital-to-analog converters (DACs) with single-ended outputs. The DAC
outputs operate using Analog Devices patented multibit sigma-delta archi-
tecture. The chip provides auxiliary input and output SPORTs to connect
to other codecs, increasing the number of channels that a single SPORT
supports. A serial peripheral interface (SPI) port is included, enabling the
microcontroller to adjust volume and other audio parameters.
The audio interface connections are shown in Figure 2-1 on page 2-3; for
more detailed information, see “Audio EZ-Extender Schematic” on
page B-1. The two AD1938 chips (referred to as AD1938_A and
AD1938_B) connect in parallel to a single SPORT. The chips connect for
a time-division multiplexed (TDM) output mode:

Blackfin Audio EZ-Extender Manual 1-3
Blackfin Audio EZ-Extender Interfaces
• At a 48 kHz sample rate, TDM mode allows up to 16 channels of
data to be sent from each chip in each direction. Each chip uses
four of the 16 input channels and eight of the 16 output channels.
The number of channels can be set up in the control registers and
is dependant on the sample rate. As the sample rate increases, the
number of possible channels decreases.
• At 96 kHz, the AD1938 operates with a maximum of eight chan-
nels in each direction. At 96 kHz, all of the TDM channels are
used by all analog outputs, but there are still four extra input chan-
nels, two of which can be used by the digital inputs.
• At the 192 kHz sample rate, a maximum of four channels in each
direction can be used, meaning that four of the output channels
cannot be used.
The auxiliary SPORTs of the AD1938_A codec connect to the
ADAV801’s auxiliary SPORT; see “System Architecture” on page 2-2 for
more information. The Sony Philips Digital Interface (S/PDIF) stream
requires two channels of the TDM stream for each direction: two channels
for left and right input audio, and two channels for left and right output
audio.
If the AD1938 codec runs at the 48 kHz sample rate, both the input and
output digital streams can be put into the TDM stream. In this case, all of
the clocks in the system must be set up relative to the recovered clock from
the SPDIF input.
At the 96 kHz sample rate, only the SPDIF inputs can be added to the
TDM stream. This is because at 96 kHz, only eight outputs channels are
available, and all eight channels are used by the outputs.
The internal phase-locked loop (PLL) of the AD1938 codec can be config-
ured to generate all of the clocking and frame sync signals. The source
clock of the PLL can be from the serial port frame sync or from an exter-
nally supplied clock. The external master clock (MCLK) comes from the
ADAV801 codec. A jumper (JP2) allows the master clock to come directly

Digital Audio Interface
1-4 Blackfin Audio EZ-Extender Manual
from the SYSCLK3 pin of the ADAV801 device or from a divided version of
the SYSCLK1 pin, divided by 2or 4. The divided clocks are necessary when
a sample rate less than 32 kHz is required. Otherwise, a signal clock fre-
quency at the MCLK pin of the AD1938 codec can generate 48 kHz,
96 kHz, or 192 kHz sample rate.
The analog input pins of the AD1938’s input signals operate in the range
from 0 Vrms to 1 Vrms. For larger signals to be input at the RCA jacks,
the input amplifiers (external to the AD1938 codec) are capable of attenu-
ating the signals. See “Configuration Jumpers and Switches” on page 2-4
for more information.
The analog output pins of the AD1938’s output signals operate in the
range from 0 Vrms to 1 Vrms. The output amplifiers are set to a gain of
1.5x, giving the system unity gain when switches SW1–4 are all ON.
Example programs demonstrating the audio interface capabilities are
included in the Examples folder of the installation directory.
For more information about the AD1938 codecs, go to http://www.ana-
log.com and search for AD1938.
Digital Audio Interface
For digital audio applications, the Blackfin Audio EZ-Extender uses the
ADAV801 codec chip. The ADAV801 chip provides an analog stereo
input, analog stereo output, digital stereo input, and a digital stereo out-
put. In addition to the inputs and outputs, the ADAV801 chip provides
an internal sample rate converter, which can be used to change a sample
rate between the chip interfaces.
On the Blackfin Audio EZ-Extender, the analog input and outputs are not
used. The digital interface can operate at up to a 200 kHz sample rate.
The ADAV801 codec operates in I2S mode, which allows only two chan-
nels (left and right) of input and two channels of output. The codec also

Blackfin Audio EZ-Extender Manual 1-5
Blackfin Audio EZ-Extender Interfaces
supplies an auxiliary serial port for connecting to other devices. The con-
figuration registers are configured using an SPI port connected to the
processor.
The ADAV801 chip provides two internal PLLs, which can produce all
necessary internal clocks for the chip interfaces. An external 27 MHz
oscillator is used as a clock source for the PLLs. The external clocks, which
also connect to the AD1938 codecs, are generated from the PLLs. The
recovered clock from the SPDIF input can be used as a clock input for the
serial ports, as well as for the generated external clock output SYSCLK3.
The primary serial port of the ADAV801 codec connects to the processor
on the mother board, while the secondary serial port connects to the
AD1938_A codec. For a block diagram of the digital audio interface , see
“System Architecture” on page 2-3; for details, see “Audio EZ-Extender
Schematic” on page B-1. The internal routing of the ADAV801 interfaces
is completely configurable. The SPDIF input and output can be routed
separately to either or both the primary and secondary serial ports.
Example programs demonstrating the digital audio interface capabilities
are included in the Examples folder of the installation directory.
For more information about the ADAV801 codecs, go to
http://www.analog.com and search for ADAV801.

Digital Audio Interface
1-6 Blackfin Audio EZ-Extender Manual