Symphony DSP56724/DSP56725 Multi-Core Audio Processors, Rev. 0
2-16
Freescale Semiconductor
Signal Descriptions
SDO4
Output
GPIO
Disconnected
ESAI’s Serial Data Output 4
When programmed as a transmitter, SDO4 is used to transmit data from
the TX4 serial transmit shift register.
SDI1
Input
ESAI’s Serial Data Input 1
When programmed as a receiver, SDI1 is used to receive serial data into
the RX1 serial receive shift register.
PC7
Input,
Output, or
Disconnected
GPIO Port C7
When the ESAI is configured as GPIO, this signal is individually
programmable as input, output, or internally disconnected. After the Reset
pin is deasserted, this pin’s function is GPIO disconnected
The default state after reset is GPIO disconnected.
Uses an internal pull-down resistor.
SDO3
Output
GPIO
Disconnected
ESAI’s Serial Data Output 3
When programmed as a transmitter, SDO3 is used to transmit data from
the TX3 serial transmit shift register.
SDI2
Input
ESAI’s Serial Data Input 2
When programmed as a receiver, SDI2 is used to receive serial data into
the RX2 serial receive shift register.
PC8
Input, Output, or
Disconnected
GPIO 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.
Uses an internal pull-down resistor.
SDO2
Output
GPIO
Disconnected
ESAI’s Serial Data Output 2
When programmed as a transmitter, SDO2 is used to transmit data from
the TX2 serial transmit shift register
SDI3
Input
ESAI’s Serial Data Input 3
When programmed as a receiver, SDI3 is used to receive serial data into
the RX3 serial receive shift register.
PC9
Input,Output, or
Disconnected
GPIO Port C9
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.
Uses an internal pull-down resistor.
Table 2-13. Enhanced Serial Audio Interface Signals (ESAI) (Continued)
Signal Name
Signal Type
State during
Reset
Description