Preliminary Product Information This document conCirrus Logic reserv

Copyrig(

Cirrus Logic, Inc.P.O. Box 17847, Austin, Texas 78760(512) 445 7222 FAX: (512) 445 7581http://www.cirrus.com

CDB8427

Evaluation Board for CS8427

Features

Receives and transmits AES/EBU, S/PDIF and EIAJ-340 compatible digital audioConvenient access to the Serial Audio Input Port and Serial Audio Output Port through headers.Runs from a single 5 Volt supply.Crystal supplied to allow operation at 48 kHz, sample rate.Digital patch area.

DescriptionThe CDB8427 is designed to allow rapid evaluation ofthe CS8427. The board is set up for easy connection toan Audio Precision or a Rohde and Schwarz test system.

Input and output data formats may independently be setto either AES/EBU, or S/PDIF with either optical or coax-ial physical format.

Separate headers are provided so the Serial Audio InputPort and Serial Audio Output Port may be interfaced tooff board circuits.

Microsoft® Windows® 98 PC software provides a GUIinterface to make configuration easy. The software com-municates through the PC’s RS232 port to amicrocontroller on the evaluation board that controls theCS8427. All the possible software modes of the CS8427may be tested.

ORDERING INFORMATIONCDB8427 Evaluation Board

I

CS8427

A m te lµ C

O ptica l In

S /P D IF In

A E S 3 In A E S 3 O u t

S /P D IF O u t

O ptica l O u t

R S 232 port to P C

tains information for a new product.es the right to modify this product without notice.

1

ht Cirrus Logic, Inc. 2002All Rights Reserved)

AUG ‘02DS477DB2

CDB8427

TABLE OF CONTENTS1. OVERVIEW ............................................................................................................................... 3

1.1 CS8427 .............................................................................................................................. 31.2 Microcontroller and Memory .............................................................................................. 31.3 Crystal Oscillators .............................................................................................................. 31.4 RS232 Port ........................................................................................................................ 31.5 LED Function Indicators ..................................................................................................... 3

2. CDB8427.EXE QUICK START GUIDE .................................................................................... 42.1 Setting up the Hardware .................................................................................................... 42.2 Installing the Software ........................................................................................................ 42.3 Starting up the Software .................................................................................................... 42.4 Starting up the Hardware ................................................................................................... 4

3. CDB8427.EXE USER'S GUIDE ................................................................................................ 63.1 Main Window ..................................................................................................................... 63.2 Board Setup ....................................................................................................................... 73.3 Script file syntax ................................................................................................................. 7

LIST OF FIGURESFigure 1. CDB8427 Control Panel Main Window ............................................................................ 6Figure 2. Board Setup Panel ........................................................................................................... 7Figure 3. CS8427 Digital Audio Transceiver ................................................................................... 9Figure 4. Atmel AVR RISC Microcontroller ................................................................................... 10Figure 5. Power Supplies and Reset Circuit.................................................................................. 11Figure 6. Silkscreen....................................................................................................................... 12Figure 7. Top PCB......................................................................................................................... 13Figure 8. Bottom PCB ................................................................................................................... 14

LIST OF TABLESTable 1. System Connections ......................................................................................................... 5Table 2. CDB8427 Jumper Settings................................................................................................ 5Table 3. Script file syntax description.............................................................................................. 7

Contacting Cirrus Logic SupportFor a com plete lis ting o f D irect Sales, D istributor, and Sales R epresentative contacts, visit the C irrus Logic w eb site at:http://www.cirrus.com/corporate/contacts/sales.cfm

IM PO RTANT NO TICE

“Pre lim inary” p roduct in form ation describes products tha t are in production, but for wh ich full characterization data is not yet ava ilable. “Advance” product infor-m ation describes products tha t a re in developm ent and subject to developm ent changes. C irrus Logic, Inc. and its subsidiaries (“C irrus”) believe that the infor-m ation contained in th is docum ent is accurate and reliable. However, the inform ation is subject to change w ithout notice and is provided “AS IS” w ithout warrantyof any kind (express or im plied). Custom ers are advised to obta in the latest version o f relevant inform ation to verify, before placing orders, tha t in form ation beingre lied on is current and com ple te. A ll products are sold subject to the term s and conditions of sale supplied a t the tim e of order acknow ledgm ent, including thosepertaining to warranty, patent infringem ent, and lim itation of liability. No responsibility is assum ed by C irrus fo r the use of th is inform ation, including use of thisinform ation as the basis for m anufacture or sale of any item s, or fo r infringem ent of patents or other righ ts of third parties. This docum ent is the property o f C irrusand by furnishing this inform ation , C irrus grants no license, express or im p lied under any patents, m ask work rights, copyrights, tradem arks, trade secrets orother inte llectual property rights. C irrus owns the copyrights o f the in form ation contained here in and gives consent for copies to be m ade of the inform ation onlyfor use w ithin your organization w ith respect to C irrus integrated circuits or other parts of C irrus. This consent does not extend to other copying such as copyingfor general d istribution , advertising or prom otional purposes, or for creating any work for resale.

An export perm it needs to be obtained from the com petent authorities of the Japanese G overnm ent if any of the products or techno logies described in this m a-terial and contro lled under the “Foreign Exchange and Foreign Trade Law” is to be exported or taken out o f Japan. An export license and/or quota needs to beobtained from the com petent au thorities of the Chinese G overnm ent if any of the products or technolog ies described in this m aterial is sub ject to the PRC ForeignTrade Law and is to be exported or taken out of the PRC.

CERTAIN APPLICATIO NS USING SEM ICO NDUCTO R PRO DUCTS M AY INVO LVE PO TENTIAL R ISKS O F DEATH, PERSO NAL INJURY, O R SEVEREPRO PERTY O R ENVIRO NM ENTAL DAM AG E (“CRITICAL APPLICATIO NS”). C IRRUS PRO DUCTS ARE NO T DESIG NED, AUTHO RIZED, O R W ARRANT-ED TO BE SUITABLE FO R USE IN L IFE-SUPPO RT DEVICES O R SYSTEM S O R O THER CRITICAL APPLICATIO NS. INCLUSIO N O F C IRRUS PRO DUCTSIN SUCH APPLICATIO NS IS UNDERSTO O D TO BE FULLY AT THE CUSTO M ER'S R ISK.

C irrus Logic, C irrus, and the C irrus Logic logo designs are tradem arks of C irrus Logic, Inc. A ll other brand and product nam es in this docum ent m ay be trade-m arks or service m arks o f their respective owners.

2

CDB8427

1. OVERVIEW

The CDB8427 evaluation board contains a CS8427and the supporting circuitry necessary for it to op-erate. The input and output options include AES3and S/PDIF in optical and coaxial formats. In soft-ware mode, the control registers of the CS8427 areset by an Atmel AVR RISC microcontroller. A Mi-crosoft Windows 98 based program communicateswith the micro through an RS232 port to control theconfiguration.

1.1 CS8427

The features and functions of the CS8427 are de-scribed in its data sheet.

1.2 Microcontroller and Memory

The functions of the board are controlled by an At-mel AVR RISC microcontroller. The board isequipped with 512 KBytes of static RAM so thatChannel Status and User bits from the AES streammay be captured and uploaded to the host PC. Themicrocontroller communicates with the CS8427through its SPI port. The Atmel AVR RISC micro-controller may be bypassed in order to utilize anexternal microcontroller through header J10. Head-er J9 allows the microcontroller on the board to beprogrammed with the programmer that is suppliedin the Atmel STK-300 development kit. Additionalsoftware development tools and applications infor-mation for the Atmel microcontroller are availableat: http://www.atmel.com.

1.3 Crystal Oscillators

There are positions for two crystal oscillators onthe board. Both locations are equipped with pinsockets that allow the oscillators to be removed.The oscillator labeled U10 provides the 6 MHzclock for the microcontroller and should not bechanged unless you plan on reprogramming the mi-cro.

U3 is the oscillator that provides the Output MasterClock for the CS8427. The board is shipped with a12.288 MHz crystal oscillator that can be stuffed atU3 to set the output sampling rate to 48 kHz.

1.4 RS232 Port

The RS232 port on the upper right hand side of theboard should be connected to the serial port of thePC running the CDB8427 control software. Followthe software instructions to properly configure theserial port for use with the evaluation board.

1.5 LED Function Indicators

LEDs D8 and D9 on the upper right hand corner ofthe board allow the user to determine when data isbeing transmitted over the RS232 link. The redLED D4 is the reset indicator and the red LED D1is connected to the RERR pin of the CS8427. Thetwo remaining LEDs on the board are not currentlyof use to the end user

3

CDB8427

2. CDB8427.EXE QUICK START GUIDE

2.1 Setting up the HardwareNote: SeeTable 1 on page 5 and Table 2 on page 5 for

the configuration and jumper settings.

1) Connect the CDB8427 to a 5 V DC power sup-ply.

2) Set: J11 to Optical, J16 to S/PDIF, enable J13(S/PDIF), and disable J15 (MUTE).

3) Connect the CDB8427 to the PC COM port us-ing RS232 cable.

4) Apply power to the board.

5) Press the RESET switch (S5).

At this point, the RERR and PROC should be lit.The hardware is now ready!

2.2 Installing the Software

1) Create a directory called CDB8427 anywhereon your system.

2) Copy CDB8427.exe into this directory.

3) If you do not already have them, copy the in-cluded DLLs msvcrt.dll and mfc42.dll intoyour \Windows\System directory.

4) If desired, create a shortcut to CDB8427.exe onyour desktop.

At this point, you are ready to start up the software.

2.3 Starting up the Software

1) Double-click on CDB8427.exe or its short-cut.

2) If you get errors right away, the COM portneeds to be set properly.

3) Click anywhere but inside one of the boxes, thisbrings up the Board Setup control panel.

4) Select the COM port you are using to connectto the CDB8427.

5) Shut down the application, reset the board, andthen restart the application.

2.4 Starting up the Hardware

1) Click anywhere but inside one of the boxes, thisbrings up the Board Setup control panel.

2) Click on the Reset button. You should see theTX and RX leds light up briefly.

3) Click on the AES3 Transmitter tab, then set theTransmitter data source to AES3 Receiver.

4) Click on the Clock Sources tab, click onRMCK derived from AES3 input frame and un-check the Stop Internal Clocks box.

5) Check the performance of the board by doingan FFT with a -1dBFS 1kHz sine wave for in-put at 44.1kHz and 48kHz sample rates usingthe optical input and optical output.

.

4

CDB8427

CONNECTOR INPUT/OUTPUT SIGNAL PRESENT+5V Input +5 Volt powerGND Input Ground connection from power supply

OPTICAL INPUT Input Digital Audio Interface optical inputS/PDIF INPUT Input Digital Audio Interface coaxial inputAES3 INPUT Input Digital Audio Interface XLR input

RS232 Input/Output Parallel RS232 port for connection to serial port of PCOPTICAL OUTPUT Output Digital Audio Interface optical output (always enabled)S/PDIF OUTPUT Output Digital Audio Interface coaxial outputAES3 OUTPUT Output Digital Audio Interface XLR output

J5 Input/Output I/O for RMCLK, ISCLK,ILRCK, and SDINJ6 Input/Output I/O for OLRCK, OSCLK, OMCK, and SDOUTJ9 Input 10-pin header for external programming of Atmel AVR µCJ10 Input/Output 12-pin header for CS8427 control from external µC

Table 1. System Connections

JUMPER PURPOSE POSITION FUNCTION SELECTEDJ11 Selects physical format of digital

audio interface input AES3 & S/PDIF

OPTICALConnects input as either AES3 or S/PDIF Connects input as OPTICAL

J12 Configures AES3 INPUT ENABLEDISABLE

AES3 INPUT enabled AES3 INPUT disabled

J13 Configures S/PDIF INPUT ENABLEDISABLE

S/PDIF INPUT enabled S/PDIF INPUT disabled

J14 Configures OPTICAL INPUT ENABLEDISABLE

OPTICAL INPUT enabled OPTICAL INPUT disabled

J16 Selects physical format of digital audio interface output

AES3S/PDIF

Connects output as AES3 XLR Connects output as S/PDIF coaxial

J17 Configures S/PDFIF OUTPUT ENABLEDISABLE

S/PDIF OUTPUT enabled S/PDIF OUTPUT disabled

J15 Configures HARDWARE MODE MUTE

ENABLEDISABLE

Enables MUTE when in hardware mode 1 Disables MUTE when in hardware mode 1

Table 2. CDB8427 Jumper Settings

5

CDB8427

3. CDB8427.EXE USER'S GUIDE

3.1 Main Window

The CDB8427 Control Panel allows you to viewand access the data flow configuration of theCS8427. See Figure 1. Clicking the right mousebutton in any of the boxes will bring up a propertymenu containing all the register bits relevant to thatblock, as well as some high level functions, such asdata sources and formatting options.

To access additional details about each block, clickthe left mouse button on the desired block. Thiswill display a control panel for the selected block.If you click outside the boxes, you will bring up theBoard Setup control panel, as shown on the nextpage. Note that you can click on any of the tabs toquickly access that section. Also, any changes youmake in the panel are immediately reflected in theMain Window, so you may wish to arrange them sothat they do not obscure each other.

Figure 1. CDB8427 Control Panel Main Window

6

CDB8427

3.2 Board Setup

The Board Setup panel has some very useful func-tions, including setting the COM Port used by theapplication, resetting the CS8427 from software, aswell as loading/saving register settings into files.See Figure 2. You can also can read or write anyregister on the CS8427 using the CS8427 RegisterAccess.

3.3 Script file syntax

The setup files generated by the board setup func-tion only record the state of the chip registers.There are many more useful commands that youcan insert into the setup scripts. Table 1 contains a

short description of these commands with their al-lowed syntax.

Note: Most commands accept either hexadecimal (indicated by either a “0x” prefix or “h” suffix) or decimal parameters.

Figure 2. Board Setup Panel

// used for single line comments

script scriptfile call an external script file named “scriptfile”

reset 1 assert reset of the CS8427

reset 0 de-assert reset of the CS8427

wr 1 30h write register 1 with hex 30

set RUN 1 set the bit field labeled RUN to 1

write 2 3 0x10 12h 13

write 3 consecutive registers start-ing from register 2 with hex 10, hex 12, and decimal 13

Table 3. Script file syntax description

7

CDB8427

8

CDB8427

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