Signal/Connection Descriptions
Table 8. Enhanced Serial Audio Interface Signals (Continued)
Signal
Name
State during
Reset
Signal Type
Signal Description
SDO4
SDI1
PC7
Output
GPIO
Serial Data Output 4—When programmed as a transmitter,
disconnected SDO4 is used to transmit data from the TX4 serial transmit shift
register.
Input
Serial Data Input 1—When programmed as a receiver, SDI1 is
used to receive serial data into the RX1 serial receive shift
register.
Input, output, or
disconnected
Port C7—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.
Internal Pull down resistor.
This input is 5 V tolerant.
SDO3
SDI2
PC8
Output
Input
GPIO
Serial Data Output 3—When programmed as a transmitter,
disconnected SDO3 is used to transmit data from the TX3 serial transmit shift
register.
Serial Data Input 2—When programmed as a receiver, SDI2 is
used to receive serial data into the RX2 serial receive shift
register.
Input, output, or
disconnected
Port C8—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.
Internal Pull down resistor.
This input is 5 V tolerant.
20
DSP56371 Technical Data
Freescale Semiconductor
FREESCALE [ Freescale ]
