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Note:
The shaded registers in Figure 12-1 are directly accessible by DSP instructions.
23
0
23
XSTR
XNADBUF
DAX
State
Machine
Figure 12-1 Digital Audio Transmitter (DAX) Block Diagram
12.2
DAX SIGNALS
The DAX has two signal lines:
•
DAX Digital Audio Output (ADO/PD1)—The ADO pin sends audio and non-audio
data in the AES/EBU, CP340, and IEC958 formats in a biphase mark format. The
ADO pin may also be used as a GPIO pin PD1 if the DAX is not operational.
•
DAX Clock Input (ACI/PD0)—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 may also be used as a GPIO pin PD0 when the
DAX is disabled or when operating from the internal DSP clock.
MOTOROLA
23
0
XNADR
XADR
XADBUFA
26
23
C-U-V
XADSR
Upload
MUX
Control
Signals
DSP56367
Global Data Bus
DMA Bus
0
XADBUFB
0
Biphase
Encoder
PRTYG
Preamble
Generator
DAX
DAX
Clock
Clocks
MUX
23
0
XCTR
ADO
ACI
DSP
Core Clock
12-2
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