CDB8420
Evaluation Board for CS8420
Features
Description
Asynchronous Sample Rate Conversion
Input to output conversion ratio as large as
1:3 or 3:1
Receives and transmits AES/EBU, S/PDIF
and EIAJ-340 compatible digital audio
Runs from a single 5 Volt supply.
Crystals are supplied to allow operation at
44.1 kHz, 48 kHz, and 96 kHz output sample
rates.
Digital patch area.
The CDB8420 is designed to allow rapid evaluation of
the CS8420. Because of the high performance of the
CS8420, the board is set up for easy connection to an
Audio Precision or a Rohde and Schwarz test system.
Currently available A/D and D/A converters are not adequate to test the full performance of the device.
Input and output data may independently be set to either
AES/EBU or S/PDIF in optical or coaxial physical
formats.
Windows 98 PC software provides a GUI interface to
make configuration easy. The software communicates
through the PC’s RS232 port to a micro-controller on the
evaluation board that controls the CS8420. All the possible software modes of the CS8420 may be tested.
ORDERING INFORMATION
CDB8420
Evaluation Board
I
Amtel
µC
RS232 port to PC
Optical Out
Optical In
S/PDIF In
CS8420
AES 3 In
Preliminary Product Information
http://www.cirrus.com
S/PDIF Out
AES 3 Out
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
Dec ‘03
DS245DB4
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CDB8420
TABLE OF CONTENTS
1. OVERVIEW ............................................................................................................................... 3
1.1 CS8420 .............................................................................................................................. 3
1.2 Micro-Controller and Memory ............................................................................................ 3
1.3 Crystal Oscillators .............................................................................................................. 3
1.4 RS232 Port ........................................................................................................................ 3
1.5 LED Function Indicators ..................................................................................................... 3
2. CDB8420.EXE QUICK START GUIDE .................................................................................... 5
2.1 Setting up the hardware: .................................................................................................... 5
2.2 Installing the software: ....................................................................................................... 5
2.3 Starting up the software: .................................................................................................... 5
2.4 Starting up the Hardware: .................................................................................................. 5
3. CDB8420.EXE USER'S GUIDE ................................................................................................ 6
3.1 Main Window ..................................................................................................................... 6
3.2 Board Setup ....................................................................................................................... 7
3.3 Script file syntax ................................................................................................................. 7
LIST OF FIGURES
Figure 1. CDB8420 Control Panel Main Window ............................................................................ 6
Figure 2. Board Setup Panel ........................................................................................................... 7
Figure 3. CS8420 Sample Rate Converter...................................................................................... 8
Figure 4. Atmel AVR RISC Micro-controller .................................................................................... 9
Figure 5. Power Supplies and Reset Circuit.................................................................................. 10
Figure 6. Silkscreen....................................................................................................................... 11
Figure 7. Top PCB......................................................................................................................... 12
Figure 8. Bottom PCB ................................................................................................................... 13
LIST OF TABLES
Table 1. System Connections ......................................................................................................... 4
Table 2. CDB8420 Jumper Settings................................................................................................ 4
Table 3. Script file syntax description.............................................................................................. 7
2
DS245DB4
CDB8420
1.
OVERVIEW
The CDB8420 evaluation board contains a CS8420
and the supporting circuitry necessary for it to operate. The input and output options include AES3
and S/PDIF in optical and coaxial formats. In software mode, the control registers of the CS8420 are
set by an Atmel AVR RISC micro-controller. A
Windows 98 based program communicates with
the micro through an RS232 port to control the configuration.
1.1
CS8420
The features and functions of the CS8420 are described in its data sheet.
1.2
Micro-Controller and Memory
The functions of the board are controlled by an Atmel AVR RISC micro-controller. The board is
equipped with 512 kilobytes of static RAM so that
Channel Status and User bits from the AES stream
may be captured and uploaded to the host PC. The
micro-controller communicates with the CS8420
through its SPI port. The Atmel AVR RISC microcontroller may be bypassed in order to utilize an
external micro-controller through header J10. Additional software development tools and applications information for the Atmel micro-controller
are available at http://www.atmel.com.
1.3
placed. The oscillator labeled U10 provides the 6
MHz clock for the micro-controller and should not
be changed.
U3 is the oscillator that provides the Output Master
Clock for the CS8420. The board is shipped with a
12.288 MHz crystal oscillator stuffed at U3 which
sets the output sampling rate to 48 kHz.
Oscillators are also provided for the frequencies of
11.2896 and 24.576 MHz. These allow the SRC to
be operated at output sampling frequencies of 44.1
and 96 kHz.
1.4
RS232 Port
The RS232 port on the upper right hand side of the
board should be connected to the serial port of the
PC running the CDB8420 control software. Follow
the software instructions to properly configure the
serial port for use with the evaluation board.
1.5
LED Function Indicators
LEDs D8 and D9 on the upper right hand corner of
the board allow the user to determine when data is
being transmitted over the RS232 link. The red
LED D4 is the reset indicator and the red LED D1
is connected to the RERR pin of the CS8420. The
two remaining LEDs on the board are not currently
of use to the end user.
Crystal Oscillators
There are two crystal oscillators on the board, both
are mounted in pin sockets that allow them to be re-
DS245DB4
3
CDB8420
CONNECTOR
+5V
GND
OPTICAL INPUT
S/PDIF INPUT
AES3 INPUT
RS232
OPTICAL OUTPUT
S/PDIF OUTPUT
AES3 OUTPUT
J5
J6
J9
J10
INPUT/OUTPUT
Input
Input
Input
Input
Input
Input/Output
Output
Output
Output
Input/Output
Input/Output
Input
Input/Output
SIGNAL PRESENT
+5 Volt power
Ground connection from power supply
Digital Audio Interface optical input
Digital Audio Interface coaxial input
Digital Audio Interface XLR input
Parallel RS232 port for connection to serial port of PC
Digital Audio Interface optical output (always active)
Digital Audio Interface coaxial output
Digital Audio Interface XLR output
I/O for RMCLK, ISCLK,ILRCK, and SDIN
I/O for OLRCK, OSCLK, OMCK, and SDOUT
10-pin header for external programming of Atmel AVR µC
12-pin header for CS8420 control by external µC
Table 1. System Connections
JUMPER
PURPOSE
J11
Selects physical format of digital
audio interface input
J12
Enables AES3 INPUT
J13
J14
J16
J17
J15
POSITION
AES3 & S/PDIF
OPTICAL
ENABLE
DISABLE
Enables S/PDIF INPUT
ENABLE
DISABLE
Enables OPTICAL INPUT
ENABLE
DISABLE
Selects physical format of digital
AES3
audio interface output
S/PDIF
Enables S/PDFIF OUTPUT
ENABLE
DISABLE
Enables HARDWARE MODE MUTE
ENABLE
DISABLE
FUNCTION SELECTED
Specifies input as either AES3 or S/PDIF type
Specifies input as OPTICAL type
AES3 INPUT enabled
AES3 INPUT disabled
S/PDIF INPUT enabled
S/PDIF INPUT disabled
OPTICAL INPUT enabled
OPTICAL INPUT disabled
Specifies output as AES3 XLR
Specifies output as coaxial S/PDIF
S/PDIF OUTPUT enabled
S/PDIF OUTPUT disabled
Enables MUTE when in hardware mode 1
Disables MUTE when in hardware mode 1
Table 2. CDB8420 Jumper Settings
4
DS245DB4
CDB8420
2. CDB8420.EXE QUICK START GUIDE
2.3
2.1
1) Double-click on CDB8420.exe or its shortcut.
Setting up the hardware:
Starting up the software:
1) Connect the CDB8420 to a 5V DC power supply.
2) If you get errors right away, the COM port
needs to be set properly.
2) Set: J11 to Optical, J16 to S/PDIF, enable J13
(S/PDIF), and disable J15 (MUTE).
3) Click anywhere but inside one of the boxes, this
brings up the Board Setup control panel.
3) Connect the CDB8420 to the PC COM port using RS232 cable.
4) Select the COM port you are using to connect
to the CDB8420.
4) Apply power to the board.
5) Shut down the application, reset the board, and
then restart the application.
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 CDB8420 anywhere
on your system.
2) Copy CDB8420.exe into this directory.
3) If you do not already have them, copy the included DLLs msvcrt.dll and mfc42.dll into
your \Windows\System directory.
4) If desired, create a shortcut to CDB8420.exe on
your desktop.
At this point, you are ready to start up the software.
DS245DB4
2.4
Starting up the Hardware:
1) Click anywhere but inside one of the boxes, this
brings up the Board Setup control panel.
2) Click on the Reset button. You should see the
TX and RX leds light up briefly.
3) Click on the Sample Rate Converter tab, then
set the SRC data source to AES3 Receiver.
4) Click on the Clock Sources tab, uncheck the
Stop Internal Clocks box and click on RMCK
derived from AES3 input frame.
5) Check the performance of the board by doing
an FFT with a -1dBFS 1kHz sine wave for input at 44.1kHz and 48kHz sample rates using
the optical input and optical output.
5
CDB8420
3. CDB8420.EXE USER'S GUIDE
3.1
Main Window
The CDB8420 Control Panel allows you to view
and access the data flow configuration of the
CS8420. Clicking the right mouse button in any of
the boxes will bring up a property menu containing
all the register bits relevant to that block, as well as
some high level functions, such as data sources and
formatting options.
To access additional details about each block, click
the left mouse button on the desired block. This
will display a control panel for the selected block.
If you click outside the boxes, you will bring up the
Board Setup control panel, as shown on the next
page. Note that you can click on any of the tabs to
quickly access that section. Also, any changes you
make in the panel are immediately reflected in the
Main Window, so you may wish to arrange them so
that they do not obscure each other.
Figure 1. CDB8420 Control Panel Main Window
6
DS245DB4
CDB8420
3.2
Board Setup
The Board Setup panel has some very useful functions, including setting the COM Port used by the
application, resetting the CS8420 by the software,
as well as loading/saving register settings into files.
You can also can read or write any register on the
CS8420 using the CS8420 Register Access.
3.3
Script file syntax
The setup files generated by the board setup function only record the state of the chip registers.
There are many more useful commands that you
can insert into the setup scripts. Here is a short description of them with their allowed syntax.
NOTE: Most commands accept either hexadecimal
(indicated by either a "0x" prefix or "h" suffix) or
decimal parameters.
//
used for single line comments
script scriptfile
call an external script file named
"scriptfile"
reset 1
assert reset of the CS8420
reset 0
de-assert reset of the CS8420
wr 1 30h
write register 1 with hex 30
set DITH 1
set the bit field labeled DITH to 1
write 2 3 0x10
12h 13
write 3 consecutive registers starting from register 2 with hex 10, hex
12, and decimal 13
Table 3. Script file syntax description
Figure 2. Board Setup Panel
DS245DB4
7
5
6
T1
1
1
2
3
J3
XLR-FEMALE
2
HDR3X1
J12
.1uF
4
C4
5
8
J11
HDR3X1
A
22pF
C40
HDR3X1
HDR3X1
1
2
3
VD
4.7K
R20
TP13
47K
R1
TP14
HDR3X1
J15
1
2
3
.1uF
C6
J14
110
236
J13
R17
1
2
3
MUTE
R15
1
2
3
.1uF
C2
47UH
L1
SUP3
TCBLD
TP12
2
TP8
TP7
2
D1
TP5
C7
B
3
825
R25
1
1uF 50V
VA
1.6K
R22
ILRCK
ISCLK
SDIN
RMCK
+
C
CS8420
4700pF
C9
CDOUT
/CS
/EMPH
RXP
RXN
VA
AGND
FILT
/RST
RMCK
RERR
ILRCK
ISCLK
SDIN
U1
0.33uF
C12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CCLK
CDIN
TXP
TXN
H/S
VD
GND
OMCK
U
INT
SDOUT
OLRCK
OSCLK
TCBL
CCLK
SUP5
SUP0
CDOUT
CDIN
H/S
APMS
/CS
SUP1
SFMT0
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TP27
C14
C11
.1uF
C8
1000pF
SDOUT
OLRCK
OSCLK
OMCK
TP28
47K
R9
VD
1uF 50V
100
R26
TP26
8
14
TP25
Figure 3. CS8420 Sample Rate Converter
LED_R
C13
TP1
47K
47K
TP2
R8
R7
1000pF
C10
HDR4X2
J5
TP6
TP4
47K
47K
TP3
R6
R5
.1uF
74VHC125
U2A
TP9
47K
R4
TP10
47K
R3
TP11
47K
R2
+
1
3
VD
.01uF
TRANSFORMER
PHONO-JACK
J1
OPT1
4
3
2
1
C1
2
6
SFMT1
+
1
/RST
1
3
5
7
2
4
6
8
SDIN
ILRCK
ISCLK
RMCK
TP23
NC
7
1
D
1000pF
.1uF
C17
+
TP20
47K
47K
TP21
R11
R10
HDR4X2
J6
TP22
C16
12.888MHz
Out GND
VD
U3
TP24
1
3
5
7
2
4
6
8
SDOUT
OLRCK
OSCLK
OMCK
1
2
3
1
2
3
J4
4
1
T2
XLR-MALE
22pF
C41
J17
HDR3X1
J16
OPT2
Document Number
SCHM DWG CDB8420 (600-00100-01)
Wednesday, November 12, 2003
Date:
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5
8
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3
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J2
TRANSFORMER
PHONO-JACK
4
3
2
1
Semiconductor Products Division
HDR3X1
84.5
R19
681
R18
R16 110
.1uF
C3
R14 6.2K
Gomez Marketing Evaluation Board
VD
FERRITE BEAD
22K1
TP15
.1uF
C5
VD
Size
B
Title
1uF 50V
L2
47K
R13
TP16
R21
TP17
2 Ohms
TP18
C15 R24
TP19
47K
R12
CEN
SUP4
INT
S/AES
2
6
8
SUP2
CDB8420
DS245DB4
HDR5X2
J9
8
7
6
5
4
3
2
1
SW DIP-8
S6
8x 47K
9
10
11
12
13
14
15
16
2
3
4
5
6
7
8
9
A
R37
TP32
100
VD
100
/PGM
R36
R32
1K
1
LED_G
D10
VD
2
U11
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
VD
VD
D[0-7]
U6
74HC4053
U7
B
TP30
PA2(AD2)
PA1(AD1)
PA0(AD0)
VD
GND
PF7(ADC7)
PF6(ADC6)
PF5(ADC5)
PF4(ADC4)
PF3(ADC3)
PF2(ADC2)
PF1(ADC1)
PF0(ADC0)
AREF
AGND
AVCC
X0
X1
12
13
RN1
74HC574
Y0
Y1
2
1
1
U5
Z0
Z1
5
3
VD
9
7
5
3
1
10
8
6
4
2
19
18
17
16
15
14
13
12
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
D1
D2
D3
D4
D5
D6
D7
D8
14
X
INH
A
B
C
D0
D1
D2
D3
D4
D5
D6
D7
2
3
4
5
6
7
8
9
15
Y
HM628512
74HC573
A[8-14]
2
3
4
5
6
7
8
9
D0
D1
D2
D3
D4
D5
D6
D7
CLK
OC
4
Z
19
18
17
16
15
14
13
12
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
D1
D2
D3
D4
D5
D6
D7
D8
11
1
17 D3
18 D4
19 D5
20 D6
21 D7
22
23 A10
24
25 A11
26 A9
27 A8
28 A13
29
30
31
D3
D4
D5
D6
D7
/CS
A10
/OE
A11
A9
A8
A13
/WE
A17
A15
D2
D1
D0
A0
A1
A2
A3
A4
A5
A6
A7
A12
A14
A16
A18
D2 15
D1 14
D0 13
12
11
10
9
8
7
6
5
A12 4
A14 3
2
1
C
OC
6
11
10
9
U8
ATmega103
TP29
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
SUP0
SUP2
SUP4
APMS
C
SUP1
SUP3
SUP5
TCBLD
R35
SFMT0
H/S
S/AES
100
MRST
SFMT1
MUTE
CEN
NC
J10
11
9
7
5
3
1
Out GND
6.000MHz
U10
HDR6X2
12
10
8
6
4
2
8
14
VD
VD
.1uF
.1uF
1uF 50V
C26
C25
L4
.1uF
C29
C33
INT
CCLK
CDOUT
.1uF
/RESET
/CS
CDIN
74VHC125
U2D
.1uF
C31
C32
1uF 50V
C34
+
VD
12
.1uF
C30
2 Ohms
R31
FERRITE BEAD
.1uF
C28
1000pF
7
1
.1uF
C27
Figure 4. Atmel AVR RISC Micro-controller
TP31
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0/INT0
XTAL1
XTAL2
GND
VD
/RST
TOSC1
TOSC2
PB7
1uF 50V
+
C24
+
C23
D
C35
.1uF
13
11
1
A14
A13
A12
A11
A10
A9
A8
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
PA3(AD3)
PA4(AD4)
PA5(AD5)
PA6(AD6)
PA7(AD7)
ALE
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
/RD
/WR
/PEN
PE0/RXD
PE1/TXD
PE2
PE3
PE4
PE5
PE6
PE7
PB0/CS
PB1/CCLK
PB2/CDIN
PB3/CDOUT
PB4
PB5
PB6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
11
C36
.1uF
825
R30
C38
.1uF
V+
V-
T2 OUT
R2 OUT
T1 OUT
R1 OUT
R33
680
680
R34
D9
D8 LED_G
LED_R
D7 1N4148
D6 1N4148
CONNECTOR DB9
P1
Document Number
SCHM DWG CDB8420 (600-00100-01)
Wednesday, November 12, 2003
E
Sheet
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Semiconductor Products Division
C39
.1uF
2
6
7
9
14
12
5
9
4
8
3
7
2
6
1
CS8420 Marketing Evaluation Board
C37
.1uF
DS232
U9
1
Date:
VD
C2+
C2-
C1+
C1-
T2 IN
R2 IN
T1 IN
R1 IN
LED_G
D5
Size
B
Title
4
5
1
3
10
8
11
13
2
15
GND
VD
16
1
22
1
22
1
DS245DB4
1
VD
D
Rev
CDB8420
9
A
BLACK
J8
RED
J7
1
1
FERRITE BEAD
L3
R27
2 Ohms
2
1
1
5
+
B
3
.01uF
C22
1
2
MRST
BAT85
D11
VD
C
BAT85
Figure 5. Power Supplies and Reset Circuit
10K
R38
VD
.1uF
C21
C20
100uF 6.3V
.1uF
100uF 6.3V
SW_MOM
S5
P6KE6.8A
Z1
+
VA
2
1
1
47K
R28
VD
74VHC125
74VHC125
U2C
8
6
VD
825
R29
LED_R
D4
/RST
D
Wednesday, November 12, 2003
Date:
Sheet
Document Number
SCHM DWG CDB8420 (600-00100-01)
2
E
of
3
Semiconductor Products Division
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5
U2B
Gomez Marketing Evaluation Board
/PGM
BAT85
D3
D2
/RESET
Size
A
Title
2
C19
4
10
2
10
1
C18
D
Rev
CDB8420
DS245DB4
Figure 6. Silkscreen
CDB8420
DS245DB4
11
Figure 7. Top PCB
CDB8420
12
DS245DB4
Figure 8. Bottom PCB
CDB8420
DS245DB4
13
CDB8420
Revision History
Release
DB4
Date
Nov 12, 2003
Changes
Updated schematics.
Moved legal statement to end of document and updated.
Added revision block.
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts
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without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify,
before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order
acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information,
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of the Chinese Government if any of the products or technologies described in this material is subject to the PRC Foreign Trade Law and is to be exported or taken out of the PRC.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE
IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS (INCLUDING MEDICAL DEVICES, AIRCRAFT SYSTEMS OR COMPONENTS AND PERSONAL OR AUTOMOTIVE SAFETY OR SECURITY DEVICES). INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS
DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING
ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service
marks of their respective owners.
I2C is a registered trademark of Philips Semiconductor. Purchase of I2C Components of Cirrus Logic, Inc., or one of its sublicensed Associated Companies conveys a license
under the Philips I2C Patent Rights to use those components in a standard I2C system.
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