NXP Semiconductors Symphony SoundBite Manuale utente

Symphony SoundBite Reference Manual, Rev. 2.0

Freescale Semiconductor 1

Document Number: SNDBITERM

Rev. 2.0

09/2008

Symphony SoundBite

Reference Manual

Contents

Section 1, “Introduction”page2

Section 2, “Functional Blocks page 3

Section 3, “Configuration and Connections page 5

Section 4, “Additional Info”page12

Section 5, “Revision History”page12

Symphony SoundBite Reference Manual, Rev. 2.0

2Freescale Semiconductor

Introduction

1Introduction

The Symphony SoundBite is a versatile audio application development board built upon the DSPB56371

Digital Signal Processor. The Symphony SoundBite costs very little and is ideal for cost-sensitive

organizations, like university digital signal processing labs, small engineering companies, and even the

frugal hobbyist.

Capable of simultaneously processing 8

independent or 4 stereo pairs of audio

input and output, the Symphony

SoundBite has 4 stereo input and output

jacks to connect to line-level analog

audio. One pair of input and output jacks

is shared with an optical S/PDIF receiver

and transmitter, enabling direct digital

audio input and output (mini TOS-link).

Four 24-bit stereo codecs handle analog

conversion at sampling rates up to 192

kHz. You can also interact with

application code running on the DSP,

using DIP switches and multi-colored

LEDs (connected to GPIO pins).

The board includes an integral,

multi-mode communication and

debugging interface that enables low

level JTAG debugging, in addition to

high-level serial communications with the DSP via SPI or I2C.

Features:

• Main Processor: 24-bit DSPB56371 Digital Signal Processor

— up to 180 million instructions per second (MIPS) at 180 MHz core clock

— 1.25 V core supply with 3.3 V peripheral I/O supply

— Dual-Harvard architecture core (two data memory spaces in addition to program space)

— On-chip memories:

– 4–44K x 24-bit words of PRAM

– 28–36K x 24-bit words of XRAM

– 16–48K x 24-bit words of YRAM

– User-configurable memory partitions

— Two Enhanced Serial Audio Interfaces (ESAIs) provide up to 8 channels of digital audio input

and output

— Serial Host Interface (SHI) provides interface for high level serial communication

— Triple timer module

— Serial I2C boot EEPROM allows for fully stand-alone operation of Symphony SoundBite

Figure 1. Symphony SoundBite Audio Demo Board

Functional Blocks

Symphony SoundBite Reference Manual, Rev. 2.0

Freescale Semiconductor 3

• Audio Subsystem:

— Three AK4556 24-bit 192 kHz stereo codecs connected to 3 sets of line-level 3.5 mm stereo

jacks

— AK4584 24-bit 192 kHz stereo codec with integrated S/PDIF transceiver

– Provides master clock for all codecs, synchronizing all digital audio signals

– One set of line-level 3.5mm stereo jacks shared with optical S/PDIF receiver and transmitter

— On-board microphone and pre-amplifier

• General Purpose I/O

— 8-position DIP switch provided for user inputs to DSP application software

— 9 LEDs in red, yellow and green provide visual indication

— Student Learning Kit (SLK) header provides compatibility with the University Relations

Project Board

• Debugging and Communication Interface

— On-board FT2232 dual USB UART provides for low-level JTAG/OnCE and high-level

Symphony Debugger Interface debuggers

— Operational mode of integrated debugger hardware is controlled by host PC application

software

— LEDs indicate the operational mode of the debugging interface

— Push-button system reset switch

— DSP boot mode configuration DIP switch

• Power Supply

— 2.1 mm barrel jack allows for the use of an external 6–9 V AC/DC power supply

(recommended configuration)

— Capable of being powered exclusively from the USB of the host computer (Powering by USB

power alone limits the analog performance capabilities of AK4584 codec)

— Capable of being powered via SLK header

— Power supply selected by a single jumper and indicated by an LED

2 Functional Blocks

The Symphony SoundBite development board consists of 4

functional blocks:

• Analog Audio Conversion

• Digital Signal Processor (DSP)

• Debug/Communication Interface

• Power Supply

See Figure 2.

Debug/Com

Interface

Power Supply

Audio

Conversion

Figure 2. Symphony SoundBite

Major Functional Blocks

DSP

Symphony SoundBite Reference Manual, Rev. 2.0

4Freescale Semiconductor

Functional Blocks

Digital Signal Processor:

A DSPB56371 device (U1) comprises the bulk of the DSP functional block and sits at the heart of the

Symphony SoundBite development board. Positions 1 through 4 of SW2 are connected to the MOD pins

of the DSP and set the boot mode. An I2C serial EEPROM (U6), connected to the DSP through positions

5 and 6 of SW2, provides non-volatile data storage and allows the Symphony SoundBite to boot up and

run applicationsoftware in a stand-alone configuration (without a PC connected to download code). Audio

data in I2S format is transmitted through the DSP's ESAI port and received via the DSP's ESAI_1 port.

The balance ofthe DSPpinsare connected to anexpansion header (CON1), as well asto an8-position DIP

switch and to 9 LEDs for general purpose use.

The sytem clock is provided by two gates of U12 and a 24.576 MHz crystal. Power-on reset and manual

reset of the DSP and codecs is controlled by the reset manager (U11, U13) and the reset switch (SW3).

Audio Conversion:

The Audio Conversion functional block consists of three AK4556 devices (U2, U3, and U4) and one

AK4584 (U5) 24-bit codec. Digital audio data is transmitted and received in I2S format. The AK4584

generates the master left/right and bit clocks for all the codecs and the DSP's ESAI ports. Four stereo pairs

(or 8 mono channels) of analog audio input and output are provided at jacks J1–J8.

Digital audio input/output in optical S/PDIF format is supported by combination analog/digital jacks (J1,

J2) and an integrated digital audio receiver/transmitter in the AK4584 device. A built-in microphone is

connected to a fixed gain preamplifier (U14) which in turn is connected through jumper JP1 to the analog

inputs at jack J1. The microphone gain can be adjusted further through the internal amplifier within the

AK4584. The AK4584 is configured by the DSP over serial control lines connected to dedicated GPIO

pins on the DSP.

Debug/Communication Interface:

Debugging and communication between a host computer's USB port and the DSP is implemented using

the FT2232 multi-mode USB device (U7). Three modes of communication are permitted between the host

computer and the DSP: I2C, SPI and JTAG/OnCE. The communication mode is selected by software on

the host PC via the GPIO pins on the FT2232 device, which route the signal lines to the appropriate

peripheral on the DSP via buffer U9 (SPI and JTAG/OnCE) and analog switch U10 (I2C).

JTAG/OnCE is used for low-level debugging of the DSP. The SHI port on the DSP can be used for

high-level communication between the DSP and host PC using I2C or SPI protocol. The USB identity of

the FT2232 is provided by the serial EEPROM (U8). LED10, LED11, andLED12 indicate whichprotocol

is in use by the PC host application software.

Power Supply:

The Power Supply allows the Symphony SoundBite board to operate from an external power supply or

directly from a host computer's USB port. Note that when the Symphony SoundBite is powered only from

the USB port, AK4584 performance may not meet its data sheet specifications. For that reason, powering

the Symphony SoundBite board with an external supply is recommended and preferred.

Jumper JP3 selects the source for the board's power supply: external power via jack PWR_JACK (short

pins 1-2), power from the host computer's USB port (short pins 2-3). Alternately, if no pins of JP3 are

shorted, the Symphony SoundBite can be supplied with regulated 5V via pin 1 of the expansion connector

CON1.

Configuration and Connections

Symphony SoundBite Reference Manual, Rev. 2.0

Freescale Semiconductor 5

CAUTION

If you power the board using the CON1 connector, JP3 must have no

jumpers in place, or the Symphony SoundBite board will get damaged.

The external supply can be 6–9 VAC or 9–12 VDC with a current capacity of at least 400 mA. When USB

powering is selected, the Symphony SoundBite board remains unpowered until the FT2232 is enumerated

with the PC host. When this occurs, the FT2232 (U7) PWREN# signal is asserted low, applying 5V from

the USB port through the the current limiting switch TPS2021 (U15) to the 3.3V and 1.25V regulators.

LED13 is lighted when the Symphony SoundBite development board has powered up successfully.

Figure 3 shows a more detailed diagram of the off-board and interconnections between the various

functional blocks on the board.

Figure 3. Symphony SoundBite Board-Block Diagram

3 Configuration and Connections

Configuring a Symphony SoundBite board is easy, because most configuration is done via software.

DSP56371

AK4556

Stereo Input 1

Stereo Output 1

Stereo Input 2

Stereo Output 2

Stereo Input 3

Stereo Output 3

AK4584

Stereo Input 0

Stereo Output 0

SPDIF Input

SPDIF Output Serial link

SW1 SW2

Boot Mode

MK1 Microphone

FT2232

USB UART

EEPROM

U19

256 Kbit

USB

U11

JTAG/OnCE

SDI/SPI

SDI/I2C

U9A

U9B

Power In

PWR-JACK

U12 U14 U17

5V 3.3V 1.25V

Audio

CODEC

Digital Signal Processor

Audio CODEC

Component placement on this

diagram does not reflect the acutal

component locations.

JP1

Symphony SoundBite Reference Manual, Rev. 2.0

6Freescale Semiconductor

Configuration and Connections

3.1 Select Power Source

NOTE

Powering the Symphony SoundBite from a USB port alone may degrade

audio performance because:

(1) The supply voltage at the AK4584 may be under the specified minimum

limit of 4.75V due to voltage drops in the USB cabling and in the power

supply section of the Symphony SoundBite board.

(2) Noise from the USB port may be transmitted through the AK4584

device because there is no regulator in the power supply line to isolate and

filter the noise.

The power source for the Symphony SoundBite board is selected using the JP3 jumper. See Table 1.

3.2 System Reset

The Symphony SoundBite board can also be reset manually using the pushbutton switch SW3, which

resets the DSP and all of the codecs.

3.3 Select Boot Mode

Select the boot mode of the DSP (and enable the I2C EEPROM) using the six-position DIP switch SW2.

SW2 positions 4:1correspond topins MOD[D:A].For the MOD pin switches (positions4 through1 only),

the switch state is the inverse of the logic state presented to the pin, so that in the ON position, a logic low

is presented to the corresponding pin. Table 2 shows the allowed boot modes for the DSP56371 device. In

the table, for any SW2 position, “0” means OFF and “1” means ON.

Table 1. JP3 Jumper Selects Power Source

Jumper

1-2 Selects external power, supplied through PWR_JACK. The polarity at PWR_JACK

is unimportant due to the presence of the bridge rectifier G1. The external power

supply should be in the range of 6–8 VAC or 8–10 VDC.

2-3 Selects USB power. When USB power is selected, the power indicator LED13 will

not illuminate until the board enumerates with the host PC.

Table 2. SW2 Selects Boot Mode

Boot

Mode MOD[D:A] SW2

[4:1]

2 0010 1101 Jump to PROM starting address (Slave SPI mode)

5 0101 1010 Bootstrap from SHI (Slave SPI mode)

60110

1001 Bootstrap from SHI (Slave I2C mode) (HCKFR=1, 100 ns filter enabled)

7 0111 1000 Bootstrap from SHI (slave I2C mode) (HCKFR=0)

9 1001 0110 Bootstrap from SHI (Serial I2C EEPROM mode) (HCKFR=1, 100 ns filter enabled)

B 1011 0100 Bootstrap from SHI (Serial SPI EEPROM mode)

Configuration and Connections

Symphony SoundBite Reference Manual, Rev. 2.0

Freescale Semiconductor 7

SW2 positions 6:5 enable the I2C serial EEPROM, allowing the Symphony SoundBite board to operate

without a host PC (If the EEPROM has been appropriately programmed with valid DSP application data

and SW2 switches 4:1 are set for bootmode 9).SW2 switches 6:5 connect ordisconnect the SDA and SCL

lines of the U6 device to the DSP. Switches 6:5 should always be in the same state, either both ON

(enabling U6) or OFF (disabling U6).

NOTE

When the on-board communication interface is used in SPI mode, switches

6:5 of SW2 must be OFF. Also, when running applications that use SPI or

I2C protocols on a host PC and the DSP, give careful consideration to all of

the SW2 switches to avoid contention.

The default state for SW2 is 110110 (SW2 positions 6:1), which sets Boot Mode 9 and enables the I2C

EEPROM (allowing stand-alone operations). As shipped from Freescale, the I2C EEPROM contains the

Symphony SoundBite demonstration application program, which is documented separately in the

Symphony SoundBite documentation.

3.4 Audio Input/Output Jacks: J1–J8

Jacks J1, J3, J5, and J7 accept line-level analog inputs and jacks J2, J4, J6, and J8 provide line-level

outputs.

The analog and optical inputs and outputs of J1 and J2 are always enabled in hardware. Jack J1 can also

accept optical digital audio input using an optical cable with mini-TOS-LINK termination. Optical digital

audio output can be obtained through jack J2 using an optical cable with mini-TOS-LINK termination.

There is no automatic hardware detection of the input source type; all detection and source selection is

done using application software in the DSP to program the appropriate registers of the AK4584 codec

(U5). For more information about the setup and programming of the AK4584 codec (U5), see the

associated materials in the Symphony SoundBite documentation.

The output of the onboard microphone preamplifier is connected to the input of U5 via jumper block JP1.

See Table 3. The default state of JP1 is 1-2 and 3-4 both jumpered, enabling microphone audio input.

C 1100 0011 Bootstrap from GPIO (Serial SPI EEPROM mode)

D 1101 0010 Jump to PROM at default HLX (Slave SPI)

E 1110 0001 Jump to PROM starting address (Slave I2C) (HCKFR=0)

F 1111 0000 Jump to PROM starting address (Slave I2C) (HCKFR=1, 100 ns filter enabled)

Table 2. SW2 Selects Boot Mode (continued)

Boot

Mode MOD[D:A] SW2

[4:1]

Symphony SoundBite Reference Manual, Rev. 2.0

8Freescale Semiconductor

Configuration and Connections

NOTE

If you use the J1 jack for analog audio input, no jumpers should be present

on JP1, or the input source and the microphone preamplifier output will

contend with each other.

3.5 General Purpose Switches: SW1

DIP switches (SW1) are provided for general purpose use by the application code running in the DSP. The

GPIO pins connected to SW1 should normally be configured to be GPIO inputs.

• In the ON state, the corresponding DSP GPIO line is pulled high and a logic high is presented to

the input.

• In the OFF state, the internal pulldown resistor presents a logic low to the input.

3.6 General Purpose LEDs: LED1–9

Nine LEDs are provided for general purpose use by DSP application code. The GPIO pins connected to

the LEDs should normally be configured as GPIO outputs.

• A logic high output on one of these GPIO pins turns ON the corresponding LED

• A logic low output on one of these GPIO pins turns OFF the corresponding LED.

Table 4 shows the schematic signal name and DSP GPIO pin that corresponds to each LED identifier.

Table 3. JP1 Jumper Selects Left/Right Input Channel

Jumper

1-2 Connects the microphone output to the left input channel of U5.

3-4 Connects the microphone output to the right input channel of U5.

Table 4. General Purpose LEDs

LED Color Schematic DSP Pin

D1 Green GPLED0 PF7

D2 Green GPLED1 PF8

D3 Green GPLED2 PF9

D4 Green GPLED3 PF10

D5 Amber GPLED4 TIO0/PB0

D6 Amber GPLED5 TIO1/PB1

D7 Red GPLED6 PC2

D8 Red GPLED7 PC5

D9 Red GPLED8 PC6

Configuration and Connections

Symphony SoundBite Reference Manual, Rev. 2.0

Freescale Semiconductor 9

3.7 Status LEDs: LED10–13

Four LEDs display the status of the board: D10–D12, D13.

3.8 Expansion Header: CON1

An expansion header (CON1) is provided to enable off-board expansion. The 5V and 3.3V power supplies

and several grounds are present on the CON1 header, as well as all GPSWx and GPLEDx lines.

Although the GPSWx lines are normally GPIO inputs, the GPSWx lines can be used as either inputs or

outputs at the CON1 header.

NOTE

When the GPSWx lines are used as an output, if the corresponding switch

position of SW1 is ON, the pull-up resistor is enabled, presenting an

additionalloadto the DSPGPIOpin when in the logic low state,which must

be accounted for.

Although the GPLEDx lines are normally GPIO outputs, the GPLEDx lines can be used as either inputs

or outputs at the CON1 header.

NOTE

When the GPLEDx lines are used as inputs, the external signal must be able

to handle the load that the presence of the LED and current limiting resistor

present to it. There are no provisions for disconnecting the LEDs from the

GPLEDx lines.

Additionally, you can modify the Symphony SoundBite board by soldering jumpers between the 4 solder

pads at CON1 to any of the 4 IRQ lines, IRQD:A, the I2C lines SDA and SCL, and GPIO pin PC7, as

desired.

Table 5. Status LEDs

LED Color Description

D10 Amber JTAG/OnCE D10–D12 display the communication

protocol in use by the host PC.

D11 Amber SDI/SPI

D12 Amber SDI/I2C

D13 Green Power Indicator D13 indicates when power is applied to the

DSP and Analog Conversion functional

blocks of the Symphony SoundBite.

Symphony SoundBite Reference Manual, Rev. 2.0

10 Freescale Semiconductor

Configuration and Connections

3.9 Connectors and Switches

Figure 4. Connectors, Switches, Headers

Table 6. Connectors, Switches, Jumpers

Connector Function

J1 Stereo Input 0 Combination analog/digital optical.

The microphone preamplifier output is connected to both channels of J1 through

jumper JP1.

J2 Stereo Output 0

J3 Stereo Input 1 Analog only.

J4 Stereo Output 1

J5 Stereo Input 2 Analog only.

J6 Stereo Output 2

J7 Stereo Input 3 Analog only.

J8 Stereo Output 3 Analog only.

PWR-JACK

J5 J7 J1

Expansion Header

CON1

General Purpose

SW1

General Purpose

LED1–9

Boot

Mode

SW2

J4 J6 J8 J2

USB

Reset

SW3

Select Power

Source JP3

LED10–13

Route Microphone to

Left/Right Channel

JP1

Microphone

Stereo Inputs

1230

Stereo Outputs

S/PDIF

LED10 JTAG

LED11 SPI

LED12 I2C

LED13 PWR

1230

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