Digital Audio Interface Signals
MOTOROLA
Signal Description
2-9
2.12
DIGITAL AUDIO INTERFACE SIGNALS
Note: The EBUOUT2 signal is only used on the 160 MAPBGA package.
2.13
SUBCODE INTERFACE
There is a 3-line subcode interface on the MCF5249. This 3-line subcode interface allows the device to
format and transmit subcode in EIAJ format to a CD channel encoder device. The three signals are
Note: The SUBR, SFSY, and the RCK signals are only used in the 160 MAPBGA
package.
2.14
ANALOG TO DIGITAL CONVERTER (ADC)
The single output on the TOUT1/ADOUT/GPO35 pin provides the reference voltage in PDM format
therefore this output requires an external integrator circuit (resistor/capacitor) to convert it to a DC level to
be used by the external comparator circuit.
Four external comparators compare the DC level obtained after filtering TOUT1/ADOUT/GPO35 with the
relevant input signals. The outputs of the comparators are fed to the 4 ADIN inputs on the MCF5249:
EBUIN3/ADIN0/GPI38, EBUIN4/ADIN1/GPI39, RXD2/ADIN2/GPI38 and CTS2/ADIN3/GPI31.
Table 2-7 Digital Audio Interface Signals
SERIAL MODULE SIGNAL
DESCRIPTION
Digital Audio In
The EBUIN1/GPI36, EBUIN2/GPI37, EBUIN3/ADIN0/GPI38,
and EBUIN4/ADIN1/GPI39 multiplexed signals can serve as
general purpose input or can be driven by various digital audio
(IEC958) input sources. Both functionalities are always active.
Input chosen for IEC958 receiver is programmed within the
audio module. Input value on the 4 pins can always be read
from the appropriate gpio register.
Digital Audio Out
The EBUOUT1_GPO36 and EBUOUT2_GPO37 multiplexed
pins can serve as general purpose I/O or as digital audio
(IEC958) output. EBUOUT1 is digital audio out for consumer
mode, EBUOUT2 is digital audio out for professional mode.
The functionality of the pins is programmed with the
GPIO-FUNCTION and GPIO1-FUNCTION register. During
reset, the pin is configured as a digital audio output.
Table 2-8 Subcode Interface Signal
SIGNAL NAME
DESCRIPTION
RCK/GPIO51
Subcode clock input. When pin is used as subcode clock, this
pin is driven by the CD channel encoder.
SFSY/GPIO52
Subcode sync output
This signal is driven high if a subcode sync needs to be
inserted in the EFM stream.
SUBR/GPIO53
Subcode data output
This signal is a subcode data out pin.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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