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Signal/Connection Descriptions
Table 9. Enhanced Serial Audio Interface_1 Signals
Signal Name
SDO4_1
Signal Type
Output
State during
Reset
GPIO
disconnected
Signal Description
Serial Data Output 4_1 —When programmed as a transmitter,
SDO4_1 is used to transmit data from the TX4 serial transmit shift
register.
SDI1_1
PE7
Input
Input, output, or
disconnected
Serial Data Input 1_1 —When programmed as a receiver,
SDI1_1 is used to receive serial data into the RX1 serial receive
shift register.
Port E7 —When the ESAI_1 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_1
Output
GPIO
disconnected
Serial Data Output 3 —When programmed as a transmitter,
SDO3_1 is used to transmit data from the TX3 serial transmit shift
register.
SDI2_1
PE8
Input
Input, output, or
disconnected
Serial Data Input 2 —When programmed as a receiver, SDI2_1
is used to receive serial data into the RX2 serial receive shift
register.
Port E8 —When the ESAI_1 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.
SDO2_1
Output
GPIO
disconnected
Serial Data Output 2 —When programmed as a transmitter,
SDO2_1 is used to transmit data from the TX2 serial transmit shift
register.
SDI3_1
PE9
Input
Input, output, or
disconnected
Serial Data Input 3 —When programmed as a receiver, SDI3_1
is used to receive serial data into the RX3 serial receive shift
register.
Port E9 —When the ESAI_1 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.
DSP56371 Data Sheet, Rev. 4.1
Freescale Semiconductor
27
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