Signal/Connection Descriptions
3.8
Enhanced Serial Audio Interface
Table 8. Enhanced Serial Audio Interface Signals
Signal
Name
State during
Reset
Signal Type
Signal Description
High Frequency Clock for Receiver—When programmed as an
HCKR
Input or output
GPIO
disconnected input, this signal provides a high frequency clock source for the
ESAI receiver as an alternate to the DSP core clock. When
programmed as an output, this signal can serve as a high-
frequency sample clock (e.g., for external digital to analog
converters [DACs]) or as an additional system clock.
PC2
Input, output, or
disconnected
Port C2—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.
HCKT
Input or output
GPIO
High Frequency Clock for Transmitter—When programmed as
disconnected an input, this signal provides a high frequency clock source for the
ESAI transmitter as an alternate to the DSP core clock. When
programmed as an output, this signal can serve as a high
frequency sample clock (e.g., for external DACs) or as an
additional system clock.
PC5
Input, output, or
disconnected
Port C5—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.
Freescale Semiconductor
DSP56371 Technical Data
17
FREESCALE [ Freescale ]
