User’ s Gu ide
January 2003 Digital Audio Products
SLEU031
IMPORTANT NOTICE
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enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
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and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty . Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR S TATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 4.5 V to 5.5 V and the output
voltage range of 3 V to 3.6 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
60°C. The EVM is designed to operate properly with certain components above 60°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated
About This Manual
Information About Cautions and Warnings
Preface
This manual describes the operation of the TAS1020B evaluation module from
Texas Instruments.
How to Use This Manual
This document contains the following chapters:
- Chapter 1—Introduction
- Chapter 2—EVM Board Operation
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you
.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
v
Related Documentation From Texas Instruments
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Related Documentation From Texas Instruments
The following is a list of data manuals that have detailed descriptions of the
integrated circuits used in the design of the TAS1020B EVM. These data
manuals can be obtained at the URL http://www.ti.com.
Part Number Literature Number
- TAS1020B SLES025
- TLV320AIC27 SLAS253
- SN74LVTH244A SCAS586
- SN74LV4737A SLLS178
- SN74CBT3245A SCDS002
- SN75HC540 SCLS007
- TPS7233 SLVS102
- TLV2362 SLOS195
TAS1020B EVM Kit Contents
TAS1020B EVM is shipped with the following:
1) TAS1020BEVM Evaluation Module
2) TAS1020BEVM CD. The CD contains the following:
a) TAS1020B Data Manual
b) TAS1020BEVM User’s Guide
c) TAS1020BEVM Schematic
d) TAS1020BEVM Bill of Materials
e) TAS1020BEVM PCB
f) TAS1020BEVM Gerber Files
g) DFU Software
3) TAS1020B Data Manual
4) TAS1020BEVM User’s Guide
5) Cover Letter
6) Contact List
vi
Emulator and Compiler Information
The emulator hardware should consist of a PC card, an interface cable, and
an emulator pod. These components may or may not be sold independently,
depending on the vendor. The emulator software should include everything
required to run the hardware. For emulator from Nohau, visit web-site
http://www.nohau.com. For emulator software from Phyton, visit web-site
http://www.phyton.com. Emulator operation must be 3.3 V.
TI example code is provided in the EEPROM onboard. See the cover letter for
instructions on getting the source code. All TI example code is written in C. An
8051 C to assembly code compiler is a very useful tool. It is recommended to
check the compiler and the emulator for compatibility before making a
selection. For more information on the Keil C compiler, please visit web-site
http://www.keil.com/c51.
Emulator and Compiler Information
vii
viii
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 EVM Board Operation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Jumper Settings 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Power the TAS1020B EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 External Power 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Bus Power 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Miscellaneous Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1 Microphone 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.2 LINE IN Connector 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.3 Headphones and Speakers 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.4 JB1 and JB2 Connectors 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Host Enumeration 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 Internal Mode 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2 External (Emulator) Mode 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 TAS1020B EVM Features (Detailed Description) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.1 External Clock 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.2 RESET Momentary Switch 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.3 Port 1 Light Emitting Diodes 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.4 Human Interface Device (HID) Switches 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.5 Suspend/Resume Mode 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.6 Device Firmware Upgrade (DFU) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1 TAS1020B EVM Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Jumper Configurations 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ix
Contents
x
Chapter 1
The TAS1020B evaluation module (EVM) is based on the TI TAS1020B
integrated circuit (IC). The TAS1020B IC is a universal serial bus (USB)
peripheral interface device designed specifically for applications that require
isochronous data streaming, e.g., streaming of digital audio data between the
host PC and the speaker system via the USB connection. The TAS1020B is
compatible with the USB specification version 1.1 and the USB audio class
specification.
The TAS1020B uses a standard 8052 microcontroller unit (MCU) core with
on-chip memory to handle all data transfer. A full explanation of how to
configure the TAS1020B to control the streaming data and set up the interface
ports and registers can be found in the TAS1020B data manual. The preface
of this user’s guide tells how to obtain the data manual.
The TAS1020B EVM is designed to allow development and evaluation of the
T AS1020B for controlling streams of data. The TAS1020B accepts USB data
streams and generates audio streams using common audio protocols at the
codec port. This programmable port allows the audio data to be output as
2
AC-Link, I
Additional features on the TAS1020B EVM board are:
- Microphone input can be used with an external microphone.
- Line input for a CD or any other device that provides an analog input.
- Audio amplifier can be used with any PC speakers.
- In-circuit emulator is primarily used for firmware development and
debugging.
- The TAS1020B EVM also includes connectors that enable the use of
alternative audio codecs. The firmware included with the EVM does not
support codecs other than the AC’97 codec provided.
Digital audio sources such as those from a PC CD player, Windows Media
Player, or other PC audio applications on the host stream data to the
TAS1020B USB interface via USB. The T AS1020B converts this data to AC’97
S, AIC, or a general-purpose mode.
Introduction
1-1
format and transfers the data to the AC’97 codec. The AC’97 codec takes the
digital data and converts it to analog. The analog data is then amplified and
output to the mini-stereo 3,5 mm-jack. The voice data from the microphone
can be recorded and stored in the host PC. See Figure 1–1 for a top level
description of the TAS1020B functions.
Figure 1–1.TAS1020B EVM Block Diagram
TAS1020B
In-Circuit
Emulator
I2C
2
I
S
GPIO
Connectors
AC’97
Codec
Power
Amp
1-2
Chapter 2
This chapter includes an overview of the TAS1020B EVM board operation.
Topic Page
2.1 Jumper Settings 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Power the TAS1020B EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Miscellaneous Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Host Enumeration 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 TAS1020B EVM Features (Detailed Description) 2-4. . . . . . . . . . . . . . . . .
EVM Board Operation
2-1
Jumper Settings
2.1 Jumper Settings
There are five jumpers on the EVM.
- JP1 is used to set power input to the EVM. If JP1 is shunted pin 1 to pin 2,
- JP2 is used to enable signals going to the AC’97 codec. During normal
- JP3 is used to put the TAS1020B either in internal mode or in external
- JP4 is used to generate external interrupt. When JP4 is in, an external
the EVM is powered through the USB bus. If JP1 is shunted pin 2 to pin 3,
a 9-Vdc power supply is needed to power the EVM.
operation, JP2 is in. This allows the signals to go to the AC’97 codec.
When using signals from connectors JB1 and JB2, it is recommended to
remove JP2. Operation for the JB1 and JB2 connectors is discussed in
Section 2.3.4.
mode. In internal mode, the application code is downloaded from the
EEPROM. In external mode, the TAS1020B MCU is disabled and logic in
the TAS1020B allows the external MCU to read/write the registers to
control the TAS1020B. If JP3 is shunted pin 1 to pin 2, the TAS1020B is
in external mode. If JP3 is shunted pin 2 to pin 3, the TAS1020B is in
internal mode.
interrupt is generated. In the external interrupt mode, the XINT pin is pulled
low. External interrupt can also be used as a remote wake-up signal.
- JP5 is used to ground the MCLKI pin of the TAS1020B. MCLKI should be
grounded if there is no MCLKI source.
Choose one of the following jumper configurations before applying power to
the EVM:
Table 2–1.Jumper Configurations
Normal/internal, external power JP1 pin 2–3 JP2 IN JP3 pin 2–3 JP4 OUT JP5 IN
Normal/internal, bus power JP1 pin 1–2 JP2 IN JP3 pin 2–3 JP4 OUT JP5 IN
Emulator/external, external power JP1 pin 2–3 JP2 IN JP3 pin 1–2 JP4 OUT JP5 IN
Emulator/external, bus power JP1 pin 1–2 JP2 IN JP3 pin 1–2 JP4 OUT JP5 IN
2.2 Power the TAS1020B EVM
The T AS1020B EVM can be powered from USB bus power or from an external
power supply.
2.2.1 External Power
Ensure JP1 is shunted pin 2 to pin 3. Set the power supply to 9 Vdc and set
the current limit to 1 A. Make sure the power supply is off before connecting
it to PJ1 of the EVM. Turn the power supply on and the LEDs labeled 9V and
5V light.
2.2.2 Bus Power
2-2
Ensure JP1 is shunted pin 1 to pin 2. Connect the USB cable from the PC to
the EVM. Only the LED labeled 5V lights.
2.3 Miscellaneous Connections
2.3.1 Microphone
A microphone can be connected to the 3,5-mm stereo jack, J8 (bottom side),
to record voice.
2.3.2 LINE IN Connector
This connector can take an analog stereo input. This analog input is digitized
and is ready for recording or playback.
2.3.3 Headphones and Speakers
Connect headphones or speakers to the 3,5-mm stereo jack, J6 (top side), to
listen to playback audio streams. Be sure to adjust to a safe volume before
streaming the audio. V olume adjustment can be done by using the buttons on
the TAS1020B EVM board, labeled S1–S3 (see Section 2.5.4, Human
Interface Device (HID) Switches, for more details) or by double clicking the
speaker icon located on the right corner of the Windows taskbar and adjusting
the main playback volume slider.
Miscellaneous Connections
Note:
Four-channel output is not supported in the included firmware. Audio cannot
be streamed to the REAR channel, 3,5-mm stereo jack (J5). The REAR
channel jack is there to aid customers in developing a 4-channel AC’97
application.
2.3.4 JB1 and JB2 Connectors
Connectors JB1 and JB2 route clocks, power, I2C, I2S, and GPIO signals from
the TAS1020B. These signals can be used to interface the TAS1020B to other
codec circuit boards for further evaluation or development of the functions of
the TAS1020B. It is recommended to remove JP2 when using the JB1 and JB2
connectors to prevent the AC’97 codec from interfering with these signals. It
is also recommended to add buffers between the AC’97 codec and the target
signals to provide signal integrity.
2.4 Host Enumeration
A standard USB cable is required to connect the EVM platform to a
downstream USB port. The EVM uses a standard type-B connector.
2.4.1 Internal Mode
The EVM as shipped is set in internal mode (EEPROM installed). The firmware
enables the host to recognize the device and to run applications pertaining to
the AC’97 codec. When connecting the host PC to the EVM via the USB bus,
the PC enumerates and displays a speaker icon on the right corner of the
taskbar. The device is ready to stream audio data.
EVM Board Operation
2-3
TAS1020B EVM Features (Detailed Description)
2.4.2 External (Emulator) Mode
See Table 2–1 for the correct jumper settings in this mode. Bring up the
application code as per the emulator manufacturer’s instructions. See the
documentation on the companion CD for further details on emulator
manufacturers. When the application is running, the EVM can be connected
to the host PC to stream audio data.
2.5 TAS1020B EVM Features (Detailed Description)
2.5.1 External Clock
An external clock can be used as a clock source for MCLKI. JP5-1 is used for
this function.
2.5.2 RESET Momentary Switch
The RESET switch resets the TAS1020B to the default state. This action
resets all registers, counters, and clocks. This action is different than the
suspend/resume mode. See Section 2.5.5, Suspend/Resume Mode, for
details on the suspend/resume operation.
2.5.3 Port 1 Light Emitting Diodes
A group of LEDs is included on the TAS1020B EVM for quick and easy GPIO
evaluation. The LEDs are connected to port 1 bits 0 through 7 of both the
in-circuit emulator socket and the TAS1020B. When the EVM is in the internal
(EEPROM installed) mode, the LEDs reflect port 1 from the TAS1020B. When
the EVM is in the external (emulator) mode, the LEDs reflect port 1 from the
emulator.
2.5.4 Human Interface Device (HID) Switches
The S1–S3 switches are general-purpose momentary buttons that can be
used to develop HID control functions using the TAS1020B EVM. These
switches are active in either internal or external mode (JP3 setting). The
firmware shipped with the EVM has HID control. The following are the
functions of these switches:
- S1: Volume increase
- S2: Volume decrease
- S3: Volume mute
2.5.5 Suspend/Resume Mode
2-4
The TAS1020B IC supports suspend/resume for USB bus-powered
applications. When the host goes into sleep mode, the TAS1020B IC
suspends all clocks and functions. When the host wakes up, the TAS1020B
IC resumes its normal functions. The TAS1020B IC can also wake up the host
from an external interrupt signal (remote wake-up).
Note:
The TAS1020B EVM board is not designed to support suspend/resume.
Therefore, the USB specification on suspend/resume does not apply to the
TAS1020B EVM board. The TAS1020B IC supports suspend/resume, and
thus functions as described above.
2.5.6 Device Firmware Upgrade (DFU)
Caution
When executing a DFU, the current code in the EEPROM is written over.
If the code needs to be protected, use another EEPROM.
The TAS1020B IC complies with the universal serial bus device-class
specification for device firmware upgrade, version 1.0.
For more information on the DFU class specification see:
TAS1020B EVM Features (Detailed Description)
http://www.usb.org
The DFU test utility included on the EVM CD can be used to download a
firmware image either to the TAS1020B RAM or to the TAS1020BEVM2
EEPROM. To download the firmware image to the EEPROM, the EEPROM
must either be blank or have an invalid header. In order to download to the
TAS1020B RAM, remove the EVM EEPROM. See the T AS1020B data manual
for the specific DFU implementation in the TAS1020B ROM.
Follow the procedures listed below to download a new firmware image using
the DFU utility.
1) Copy the DFU software from the CD to a directory on your PC.
2) Connect the EVM to the host PC. If the EVM is being connected for the first
time, the OS tries to locate the appropriate DFU drivers. When asked,
point to the directory where you copied the DFU software.
3) Create a shortcut for the DFU.EXE file on the desktop.
4) Double click on the DFU.EXE icon on the desktop. The DFU utility window
comes up.
5) Click on the REFRESH button. There should be no error message.
…
6) Click on the
button located to the right of the DOWNLOAD box. A file
select window appears.
7) Select the file containing the new TAS1020B application firmware image
and header.
8) Click on the check box next to DOWNLOAD WHOLE FILE.
EVM Board Operation
2-5
TAS1020B EVM Features (Detailed Description)
9) Click on the DOWNLOAD button. The utility downloads the file to the
TAS1020B.
10) Click on the GET STATUS button.
11) Click the RESET button. The EVM should re-enumerate using the newly
downloaded firmware.
2-6
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