SPDIF Transmitter Digital Audio Interface
2.14 SPDIF Transmitter Digital Audio Interface
Table 2-13 Digital Audio Interface (DAX) Signals
Signal
Name
State During
Reset
Type
Signal Description
ACI
Input
GPIO
Audio Clock Input—This is the DAX clock input. When programmed to use
Disconnected 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 D 0—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.
This input is 3.3V tolerant.
ADO
PD1
Output
GPIO
Digital Audio Data Output—This signal is an audio and non-audio output in
Disconnected the form of AES/EBU, CP340 and IEC958 data in a biphase mark format.
Input, Output, or
Disconnected
Port D 1—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.
This input is 3.3V tolerant.
2.15 Timer
Table 2-14 Timer Signal
Signal
Name
State during
Signal Description
Reset
Type
Input or Output
TIO0
Input
Timer 0 Schmitt-Trigger Input/Output—When timer 0 functions as an
external event counter or in measurement mode, TIO0 is used as input. When
timer 0 functions in watchdog, timer, or pulse modulation mode, TIO0 is used
as output.
The default mode after reset is GPIO input. This can be changed to output or
configured as a timer input/output through the timer 0 control/status register
(TCSR0). If TIO0 is not being used, it is recommended to either define it as
GPIO output immediately at the beginning of operation or leave it defined as
GPIO input but connected to Vcc through a pull-up resistor in order to ensure
a stable logic level at this input.
This input is 3.3 V tolerant.
DSP56367 Technical Data, Rev. 2.1
2-18
Freescale Semiconductor
FREESCALE [ Freescale ]
