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Signal/Connection Descriptions
3.10 SPDIF Transmitter Digital Audio Interface
Table 10. Digital Audio Interface (DAX) Signals
Signal
Name
ACI
Type
Input
State During
Reset
GPIO
Disconnected
Signal Description
Audio Clock Input —This is the DAX clock input. When
programmed to use an external clock, this input supplies the DAX
clock. The external clock frequency must be 256, 384, or 512
times the audio sampling frequency (256 × Fs, 384 × Fs or 512 ×
Fs, respectively).
PD0
Input,
output, or
disconnected
Port D0 —When the DAX is configured as GPIO, this signal is
individually programmable as input, output, or internally
disconnected.
The default state after reset is GPIO disconnected.
Internal Pull down resistor.
This input is 5 V tolerant.
ADO
Output
GPIO
Disconnected
Digital Audio Data Output —This signal is an audio and
non-audio output in the form of AES/SPDIF, CP340 and IEC958
data in a biphase mark format.
PD1
Input,
output, or
disconnected
Port D1 —When the DAX is configured as GPIO, this signal is
individually programmable as input, output, or internally
disconnected.
The default state after reset is GPIO disconnected.
Internal Pull down resistor.
This input is 5 V tolerant.
DSP56371 Data Sheet, Rev. 4.1
Freescale Semiconductor
29
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