CDB4391A
8. CONTROL PORT SOFTWARE
The CDB4391A is shipped with Windows based software for interfacing with the CS4391A control port
via the DB25 connector, P1. The software can be used to communicate with the CS4391A in either SPI
or I
2
C
mode; however, in SPI mode the CS4391A registers are write-only. Note: The CDB4391A must
be configured for control port mode as shown in Table 4.
Further documentation for the software is available on the distribution diskette. The documentation is
available in the plain text format file, README.TXT.
9. DSD OPERATION
The CDB4391A supports Direct Stream Digital (DSD) operation through the header for external clocks
and data, J9. The CS4391A must be placed into the DSD mode and the jumpers HDR1 through HDR6 must
be placed into the external clock positions.
CONNECTOR
+5V (J6)
+5V (J1)
V
L
V
EE
V
CC
GND
Coax Input
Optical Input
J9
Parallel Port
HDR9
AOUTA
AOUTB
INPUT/OUTPUT
Input
Input
Input
Input
Input
Input
Input
Input
Input/Output
Input/Output
Input/Output
Output
Output
+ 5 Volt power
+ 4.75 to + 5.25 Volt power for the CS4391A
+ 1.8 to +5.5 digital interface voltage (Note that V
L
should not
exceed the voltage applied to the +5V J1 terminal)
-12 to -9V negative supply for the op-amp
+9 to +12V positive supply for the op-amp
Ground connection from power supply
Digital audio interface input via coax
Digital audio interface input via optical
I/O for master, serial, left/right clocks and serial data
Parallel connection to PC for SPI / I
2
C control port signals
I/O for SPI / I
2
C control port signals
Channel A line level analog output
Channel B line level analog output
Table 2. System Connections
SIGNAL PRESENT
6
DS600DB1
CIRRUS [ CIRRUS LOGIC ]
