5 predefined sample scripts, Cdb4244 – Cirrus Logic CDB4244 User Manual
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DS900DB2
CDB4244
2.5
Predefined Sample Scripts
The CDB4244 FlexGUI software comes furnished with four scripts that can quickly configure the board for
use with an external S/PDIF transmitter and receiver. These scripts configure the CS4244, CS8416, and
CS8406 to operate using the 24-bit Left-Justified serial interface format, with a master clock rate of 256
times the sample rate. The sample rate is set within the external S/PDIF source. System timing is mastered
by the CS8416 at multiples of the sample rate set by the S/PDIF source.
The system master clock recovered by the CS8416 is passed through the CS2000 before being presented
to the CS4244 and the CS8406. Serial audio data from the incoming S/PDIF stream is routed from the
CS8416 to the SDIN1 and SDIN2 pins of the CS4244, while data on the SDOUT1 pin of the CS4244 is rout-
ed to the CS8406 to be sent along the outgoing S/PDIF stream. The CS4244 is configured to operate in
single-speed mode; see the CS4244 data sheet for the range of allowable incoming sample rates. The four
scripts are defined as follows:
See
regarding VA supply selection.
QuickSetup_Coax_VA_3R3V_AIN12:
Configures the CDB4244 as described above when an exter-
nal S/PDIF transmitter is connected to the “S/PDIF IN” input of
the board using a coaxial cable, and a 3.3-V supply is used to
power VA.
QuickSetup_Coax_VA_5V_AIN12:
Configures the CDB4244 as described above when an exter-
nal S/PDIF transmitter is connected to the “S/PDIF IN” input of
the board using a coaxial cable, and a 5-V supply is used to
power VA.
QuickSetup_Optical_VA_3R3V_AIN12: Configures the CDB4244 as described above when an exter-
nal S/PDIF transmitter is connected to the “S/PDIF IN” input of
the board using an optical cable, and a 3.3-V supply is used to
power VA.
QuickSetup_Optical_VA_5V_AIN12:
Configures the CDB4244 as described above when an exter-
nal S/PDIF transmitter is connected to the “S/PDIF IN” input of
the board using an optical cable, and a 5-V supply is used to
power VA.