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Digital Audio Transmitter
DAX Signals
23
0
23
XSTR
XNADBUF
DAX
State
Machine
Figure 8-1 Digital Audio Transmitter (DAX) Block Diagram
8.2
DAX SIGNALS
The DAX has two signal lines:
• DAX Digital Audio Output (ADO)—The ADO pin sends audio and
non-audio data in the AES/EBU, CP340, and IEC958 formats in a biphase
mark format. ADO stays high when the DAX is disabled, and during
hardware reset and software reset.
• DAX Clock Input (ACI)—When the DAX clock is configured to be supplied
externally, the external clock is applied to the ACI pin. The frequency of the
external clock must be 256 times, 384 times, or 512 times the audio sampling
frequency (256 Fs, 384 Fs, or 512 Fs). The ACI pin is high impedance
during hardware reset and software reset.
Note: If the DAX is not used, connect the ACI pin to ground through an external
pull-down resistor to ensure a stable logic level at the input.
8-4
Global Data Bus
0
XCTR
26
23
C-U-V
XADSR
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MUX
Control
Signals
DSP56012 User's Manual
23
0
XADRA
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0
Biphase
Encoder
PRTYG
Preamble
Generator
DAX
DAX
Clock
Clocks
MUX
23
0
XADRB
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XADBUF
ADO
ACI
DSP
Core Clock
AA0606k
MOTOROLA
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