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Signal/Connection Descriptions
Enhanced Serial Audio Interface
1-12
DSP56364 Advance Information
MOTOROLA
FST
Input or output
GPIO
disconnected
Frame Sync for Transmitter
—This is the transmitter frame sync
input/output signal. For synchronous mode, this signal is the frame
sync for both transmitters and receivers. For asynchronous mode,
FST is the frame sync for the transmitters only. The direction is
determined by the transmitter frame sync direction (TFSD) bit in the
ESAI transmit clock control register (TCCR).
PC4
Input, output,
or
disconnected
GPIO
disconnected
Port C 4
—When the ESAI is configured as GPIO, this signal is indi-
vidually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
SCKR
Input or output
GPIO
disconnected
Receiver Serial Clock
—SCKR provides the receiver serial bit clock
for the ESAI. The SCKR operates as a clock input or output used by
all the enabled receivers in the asynchronous mode (SYN=0), or as
serial flag 0 pin in the synchronous mode (SYN=1).
When this pin is configured as serial flag pin, its direction is determined
by the RCKD bit in the RCCR register. When configured as the output
flag OF0, this pin will reflect the value of the OF0 bit in the SAICR regis-
ter, and the data in the OF0 bit will show up at the pin synchronized to
the frame sync in normal mode or the slot in network mode. When con-
figured as the input flag IF0, the data value at the pin will be stored in
the IF0 bit in the SAISR register, synchronized by the frame sync in nor-
mal mode or the slot in network mode.
PC0
Input, output,
or
disconnected
GPIO
disconnected
Port C 0
—When the ESAI is configured as GPIO, this signal is indi-
vidually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
SCKT
Input or output
GPIO
disconnected
Transmitter Serial Clock
—This signal provides the serial bit rate
clock for the ESAI. SCKT is a clock input or output used by all
enabled transmitters and receivers in synchronous mode, or by all
enabled transmitters in asynchronous mode.
PC3
Input, output,
or
disconnected
GPIO
disconnected
Port C 3
—When the ESAI is configured as GPIO, this signal is indi-
vidually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
Table 1-10 Enhanced Serial Audio Interface Signals (continued)
Signal
Name
Signal Type
State during
Reset
Signal Description
F
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n
.