Cirrus Logic CDB8416 User Manual

CDB8416

Optical In

Coax In

XLR In

Optical Out
Coax Out
XLR Out

CS8416 CS8406

Parallel Port to PC

Evaluation Board for the CS8416 and CS8406

Features

• CS8416 Digital Audio Receiver

• CS8406 Digital Audio Transmitter

• Receives and Transmits AES/EBU, S/PDIF,

and EIAJ-340-compatible Digital Audio

• Analog and Digital 3.3 Volt Supply

• 3.3 to 5.0 Volt Logic Interface Supply

• Operates In Stand-alone Hardware Mode or

Computer-controlled Software Mode

• Balanced and Unbalanced Inputs Available

I

Description

The CDB8416 is designed to allow easy evaluation of
the CS8416 and CS8406. The board is designed for
easy connection to an Audio Precision or other digital au­dio test system.

Input and output data may be set for either balanced us­ing the XLR connectors or unbalanced using the coax or
optical connectors.

Windows PC software provides a GUI to make configu­ration easy in Software Mode. The software
communicates through the PC’s parallel port to control
the internal registers so that all the possible software
modes of the CS8416 and CS8406 may be tested.

ORDERING INFORMATION

CDB8416 Evaluation Board

http://www.cirrus.com

Copyright  Cirrus Logic, Inc. 2009

(All Rights Reserved)

APRIL ‘09

DS578DB3

TABLE OF CONTENTS

1. OVERVIEW ..........................................................................................................4

1.1 CS8416 and CS8406 ................................................................................................4

1.2 Parallel Port ..............................................................................................................4

1.3 Serial Digital Audio Inputs .........................................................................................4

1.4 Serial Digital Audio Outputs ......................................................................................4

1.5 Three-wire (PCM) Serial Audio Input and Output .....................................................4

1.6 Crystal Oscillators .....................................................................................................4

1.7 LED Function Indicators ............................................................................................5

2. CONFIGURATION SETTINGS ............................................................................5

3. BOARD SETUP ...................................................................................................7

3.1 Power Supplies: ........................................................................................................7

3.2 Hardware Mode Settings: .........................................................................................7

3.3 Software Mode Settings: ...........................................................................................7

3.3.1 Installing the Software: .................................................................................................7

3.3.2 Verifying Board Operation: ...........................................................................................7

4. CDB8416.EXE USER'S GUIDE ...........................................................................8

4.1 Main Window ............................................................................................................8

5. BILL OF MATERIAL ..........................................................................................23

6. REVISION HISTORY .........................................................................................26

CDB8416

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LIST OF FIGURES

Figure 1. CS8416 Control Panel..................................................................................................... 8

Figure 2. CS8406 Control Panel..................................................................................................... 9

Figure 3. Advanced Control Panel.................................................................................................. 9

Figure 4. CDB8416 Block Diagram............................................................................................... 10

Figure 5. Power............................................................................................................................. 11

Figure 6. Digital Audio Inputs........................................................................................................ 12

Figure 7. Hardware Switches........................................................................................................ 13

Figure 8. Buffers............................................................................................................................ 14

Figure 9. Clock Buffers.................................................................................................................. 15

Figure 10. CS8416........................................................................................................................ 16

Figure 11. CS8406........................................................................................................................ 17

Figure 12. Digital Audio Outputs................................................................................................... 18

Figure 13. PC Control Interface .................................................................................................... 19

Figure 14. Silkscreen Top............................................................................................................. 20

Figure 15. Top............................................................................................................................... 21

Figure 16. Bottom.......................................................................................................................... 22

LIST OF TABLES

Table 1. System Connections ........................................................................................................ 5

Table 2. CDB8416 Jumper Settings ...............................................................................................5

Table 3. CDB8416 Switch Settings ................................................................................................ 6

Table 4. CDB8416 Bill of Materials .............................................................................................. 23

CDB8416

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CDB8416

1. OVERVIEW

The CDB84166 evaluation board contains a
CS8416 and a CS8406 and the supporting circuitry
necessary to operate them. The board provides bal­anced XLR and unbalanced optical and coaxial in­puts and outputs as outlined in the AES3 and
IEC60958 standards. In Software Mode, the con­trol registers of the CS8416 and CS8406 are set by
a Windows based program through the parallel port
of a PC.

1.1 CS8416 and CS8406

The features and functions of the CS8416 and the
CS8406 are described in their respective data
sheets.

1.2 Parallel Port

To use the CS8416 and CS8406 on the board in
Software Mode, the parallel port on the upper right
hand side of the board should be connected to the
parallel port of the PC running the CDB8416 con­trol software.

1.3 Serial Digital Audio Inputs

The left edge of the board is occupied by a row of
serial digital audio input connectors. In either
Hardware or Software Mode the user must select
which inputs are to be used via the switch setting,
INPUT, on switch S3.

Set the switch to the open position to select the
XLR balanced input which will use the RXP1 and
RXN inputs of the CS8416.

Set the switch to the closed position to select the
optical/coaxial unbalanced inputs which will use
the RXP0 and RXP2 through RXP7 inputs of the
CS8416. This will AC couple the RXN input to
GND. Note that in Hardware Mode, only RXP0
through RXP3 on the CS8416 are available for use.
To select between the inputs in Hardware Mode,
use the RXSEL0 and RXSEL1 switches on S3.

1.4 Serial Digital Audio Outputs

The right edge of the board is occupied by the serial
digital audio outputs. The optical S/PDIF output is
always enabled. The user may also choose to en­able either the coaxial S/PDIF output or the XLR
AES3 output via jumper J11. These outputs are
transformer coupled.

1.5 Three-wire (PCM) Serial Audio Input and Output

Header J18 is provided so the user may access the
three wire serial audio ports of the receiver and
transmitter. The purpose of this port is to allow the
user to connect external circuitry such as a DAC,
ADC, or DSP to the receiver and transmitter. Sig­nals going into or out of these headers should be
operated at VL+.

Setting switch S1-M/S
CS8416 as the master and the CS8406 as slave for
LRCK and SCLK. Setting switch S1-M/S in the
closed position sets the CS8406 as the master and
the CS8416 as slave for LRCK and SCLK.

Setting switch S3-8416_PCM to the open position
will turn off all of the input/output buffers for the
CS8416. Setting switch S4-8406_PCM to the open
position will turn off all of the input/output buffers
for the CS8406. These switches allow the user to
independently set the input and output for the
CS8416 and CS8406.

in the open position sets the

1.6 Crystal Oscillators

Oscillator Y1 provides the System Clock (OMCK)
for the CS8416. The crystal oscillator on the board
is mounted in pin sockets that allow it to be re­moved or replaced. The board is shipped with a

12.288 MHz crystal oscillator stuffed at Y1, setting

the output sampling rate to 48 kHz. Please refer to
the CS8416 data sheet for details on OMCK opera­tion.

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CDB8416

1.7 LED Function Indicators

Several LEDs are provided to indicate board func­tions. D9 indicates that power is present to the
VD+/VA+ section of the CS8416 and CS8406.

NV/RERR, AUDIO, and 96 kHz output of the
CS8416 in Hardware Mode. See the CS8416 data
sheet for an explanation of the conditions that acti­vate each of these outputs.

D11, D12, and D13 indicate the status of the

2. CONFIGURATION SETTINGS

CONNECTOR INPUT/OUTPUT SIGNAL PRESENT

J3 (+5V) Input

J4 (GND) Input

J5 (VL+) Input

J6 (VD+/VA+) Input

J9, J16, J21 Input
OPT1-OPT4 Input

J2 Input

J1 Input/Output
J20 Output
J19 Output
J10 Output
J18 Input/Output

Table 1. System Connections

+5 Volt Supply for supporting circuitry
Ground connection from power supply
+3.3 to 5.0 Volt Digital Logic power for the CS8416 and CS8406
+3.3 Volt VD+/VA+ when not using the onboard regulator
Digital Audio Interface coaxial input
Digital Audio Interface optical input
Digital Audio Interface XLR input
Parallel port for connection to parallel port of PC
Digital Audio Interface optical output
Digital Audio Interface coaxial output
Digital Audio Interface XLR output
I/O for CS8416 and CS8406 PCM data and clocks

JUMPER PURPOSE POSITION FUNCTION SELECTED

J7

J8

J12

J13

J17

J14

J15

J11

Selects between using a separate supply for
VL+ or using the +5 Supply.

Selects between using a separate supply for
VD+/VA+ or using the onboard +3.3V regulator.

Current measurement for CS8416 VA+

Current measurement for CS8416 VD+

Current measurement for CS8416 VL+

Current measurement for CS8406 VD+

Current measurement for CS8406 VL+

Selects between coaxial or XLR output

ADJUST

+5V

REG

ADJUST

CLOSED

OPEN

CLOSED

OPEN

CLOSED

OPEN

CLOSED

OPEN

CLOSED

OPEN

XLR

COAX

Uses J5 to supply from +3.3V to +5.0V for VL+ Uses
J3 to supply +5V for VL+

U s e s t he o n b o a r d + 3 . 3 V r e g u l a t o r f o r V D + / VA +
Uses J6 to provide the +3.3V supply for VD+/VA+

Normal operation
Use J13 to measure CS8416 VA+ current

Normal operation
Use J12 to measure CS8416 VD+ curren t

Normal operation
Use J16 to measure CS8416 VL+ current

Normal operation
Use J14 to measure CS8406 VD+ curren t

Normal operation
Use J15 to measure CS8406 VL+ current

Selects XLR output on J10
Selects coaxial output on J19

Table 2. CDB8416 Jumper Settings

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SWITCH PURPOSE POSITION FUNCTION SELECTED

S1-H/S

S1-M/S

S1-SFMT1
S1-SFMT0

S3-INPUT

S3-8416_PCM

S3-NVSEL

S3-RXSEL1
S3-RXSEL0

S3-TXSEL1
S3-TXSEL0

S4-8406_PCM

S4-TCBLD

S4-CEN

Selects Hardware or Software Mode for
CS8416 and CS8406.

Selects Master or Slave Mode for LRCK
and SCLK.

Selects serial audio output format for the
CS8416 and input format for the CS8406.

Selects CS8416 receiver input topology.

Controls the input/output buffers for the
CS8416 serial audio port.

Selects between NVERR and RERR.

Hardware mode RXP input channel select
for the CS8416.

Hardware mode TX pass through channel
select for the CS8416

Controls the input/output buffers for the
CS8406 serial audio port.

Selects the direction of TCBL for the
CS8406.

Selects input method for channel status,
user, and validity data.

OPEN

CLOSED

OPEN

CLOSED

00
01
10
11

OPEN

CLOSED

OPEN

CLOSED

OPEN

CLOSED

00
01
10
11

00
01
10
11

OPEN

CLOSED

OPEN

CLOSED

OPEN

CLOSED

CS8416 and CS8406 are in Hardware Mode.
CS8416 and CS8406 are in Software Mode.

CS8416 Master. CS8406 Slave.
CS8416 Master. CS8406 Slave.

Left Justified 24 bit
I2S 24 bit
Right Justified 24 bit
Direct AES3 (CS8416)
Right Justified 16 bit (CS8406)

XLR balanced input.
Optical/Coaxial unbalanced input.

CS8416 I/O buffers off.
CS8416 I/O buffers on.

NVERR output selected.
RERR output selected.

RXP0 Selected
RXP1 Selected
RXP2 Selected
RXP3 Selected

RXP0 pass through to TX
RXP1 pass through to TX
RXP2 pass through to TX
RXP3 pass through to TX

CS8406 I/O buffers off.
CS8406 I/O buffers on.

TCBL set to output.
TCBL set to input.

Mode B is selected.
Mode A is selected.

Table 3. CDB8416 Switch Settings

CDB8416

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CDB8416

3. BOARD SETUP

3.1 Power Supplies:

1) Verify that all power supplies are off before
making connections.

2) Connect a +3.3 V DC power supply to the
VD+/VA+ (J6) binding post and place jumper
J8 in the ADJUST position. This connection
may be omitted by setting J8 to the REG posi­tion. VD+/VA+ will be derived from the on­board +3.3V regulator.

3) Connect a +3.3 V to +5.0 V DC power supply
to the VL+ (J5) binding post and place jumper
J7 in the ADJUST position. This connection
may be omitted by setting J7 to the +5 V posi­tion. VL+ will be derived from the +5 V bind­ing post.

4) Connect a +5.0 V DC power supply to the +5 V
(J3) binding post.

5) Connect the common ground of the power sup­plies to the GND (J4) binding post.

6) Apply power to the board. D9 should illumi­nate indicating power is applied to VD+/VA+.

3.2 Hardware Mode Settings:

1) Place switch S1-H/S in the OPEN position.

2) Place switches S3-INPUT, S3-8416_PCM, S3­NVSEL, S3-RXSEL1, S3-RXSEL0, S3­TXSEL1, S3-TXSEL0, S1-M/S, S1-SFMT1,
S1-SFMT0, S4-8406_PCM, S4-TCBLD, S4­CEN to the appropriate positions.

3) Press and release the RESET switch S3. The
board should now be setup for use in Hardware
Mode.

3.3 Software Mode Settings:

effect Software Mode operation.

3) Press and release the RESET switch S2. The
board should now be setup for use in Software
mode.

4) Connect a DB-25 parallel port cable from the
PC’s parallel port to J1 on the CDB8416.

3.3.1 Installing the Software:

1) Create a directory called CDB8416 anywhere
on your system.

2) Copy CDB8416.exe from the included CD into
this directory.

3) Run port95nt.exe from the CD. After running
the program the system will need to be restart­ed.

4) If desired, create a shortcut to CDB8416.exe on
your desktop. You should now be able to run
CDB8416.exe.

5) Double-click on CDB8416.exe or its shortcut.

6) Click on the button on the lower right labeled
“Advanced”.

7) Select the LPT port you are using to connect to
the CDB8416.

8) Shut down the application, reset the board, and
then restart the application.

3.3.2 Verifying Board Operation:

1) In the “CS8416 AES Receiver Controls” win­dow, select the check box “Enable Internal
Clocks” (enables the RUN bit in the Clock
Control register).

2) In the “CS8406 AES Transmitter Controls”
window, select the check box “Enable Clocks”
(enables the RUN bit in the Clock Control reg­ister).

1) Place switch S1-H/S in the CLOSED position.

2) Place switches S1-M/S, S3-INPUT, S3­8416_PCM, and S4-8406_PCM to the appro­priate positions. All other switch setting do not

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3) In the “CS8416 AES Receiver Controls” win­dow, select the check box “Generate
SCLK/LRCK”. Make sure that switch S1-M/S
is in the OPEN position.

CDB8416

Figure 1. CS8416 Control Panel

4) Check the performance of the board by doing
an FFT with a -1 dBFS 1 kHz sine wave for in­put at a 48 kHz sample rate using the optical in­put and optical output.

4. CDB8416.EXE USER'S GUIDE

4.1 Main Window

The main window of the CDB8416 Control Appli­cation allows the user to view the configuration of
the CS8416. Clicking the left mouse button on the

CS8406 Controls button will bring up a control
panel containing all the register bits relevant to that
part.

Clicking on the Advanced button at the lower right
brings up the Advanced Options control panel.
Within the Advanced Options you may read and
write hex values into specified registers in either
part. Changes made on the CS8406 or CS8416 con­trol panels will also be immediately reflected in the
Main Window, so you may wish to arrange them so
that they do not obscure each other.

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