Freescale Semiconductor DSP56374 User Manual page 38

Enhanced Serial Audio Interface
Table 2-8. Enhanced Serial Audio Interface Signals (continued)
Signal Name Signal Type
SCKR Input or Output
PC0 Input, Output, or
Disconnected
SCKT Input or Output
PC3 Input, Output, or
Disconnected
SDO5
SDI0
PC6 Input, Output, or
Disconnected
2-10
State during
Reset
GPIO
Disconnected
GPIO
Disconnected
Output GPIO
Disconnected
Input
DSP56374 Users Guide, Rev. 1.2
Signal Description
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 register, 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 configured 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 normal mode or the slot
in network mode.
Port C0—When the ESAI is configured as GPIO, this
signal is individually programmable as input, output, or
internally disconnected.
The default state after reset is GPIO disconnected.
This pin has an internal pull-down resistor.
This input is 5 V tolerant.
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.
Port C3—When the ESAI is configured as GPIO, this
signal is individually programmable as input, output, or
internally disconnected.
The default state after reset is GPIO disconnected.
This pin has an internal pull-down resistor.
This input is 5 V tolerant.
Serial Data Output 5—When programmed as a
transmitter, SDO5 is used to transmit data from the TX5
serial transmit shift register.
Serial Data Input 0—When programmed as a receiver,
SDI0 is used to receive serial data into the RX0 serial
receive shift register.
Port C6—When the ESAI is configured as GPIO, this
signal is individually programmable as input, output, or
internally disconnected.
The default state after reset is GPIO disconnected.
This pin has an internal pull-down resistor.
This input is 5 V tolerant.
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