DSP56364P datasheet(13/148 Pages) FREESCALE

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Enhanced Serial Audio Interface

DSP56364 Technical Data, Rev. 4.1

Freescale Semiconductor

2-9

2.8

Enhanced Serial Audio Interface

Table 2-10 Enhanced Serial Audio Interface Signals

Signal

Name

Signal Type

State During

Reset

Signal Description

HCKR

Input or output

GPIO

disconnected

High Frequency Clock for Receiver—When programmed as an 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

GPIO

disconnected

Port C 2—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 input is 5 V tolerant.

HCKT

Input or output

GPIO

disconnected

High Frequency Clock for Transmitter—When programmed as 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

GPIO

disconnected

Port C 5—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 input is 5 V tolerant.

FSR

Input or output

GPIO

disconnected

Frame Sync for Receiver—This is the receiver frame sync input/output signal.

In the asynchronous mode (SYN=0), the FSR pin operates as the frame sync

input or output used by all the enabled receivers. In the synchronous mode

(SYN=1), it operates as either the serial flag 1 pin (TEBE=0), or as the

transmitter external buffer enable control (TEBE=1, RFSD=1).

When this pin is configured as serial flag pin, its direction is determined by the

RFSD bit in the RCCR register. When configured as the output flag OF1, this

pin will reflect the value of the OF1 bit in the SAICR register, and the data in the

OF1 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 IF1, the data

value at the pin will be stored in the IF1 bit in the SAISR register, synchronized

by the frame sync in normal mode or the slot in network mode.

PC1

Input, output, or

disconnected

GPIO

disconnected

Port C 1—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 input is 5 V tolerant.

FST

Input or output

GPIO

disconnected

Frame Sync for Transmitter—This is the transmitter frame sync input/output

signal. For synchronous mode, this signal is the frame sync for both transmitters

and receivers. For asynchronous mode, FST is the frame sync for the

transmitters only. The direction is determined by the transmitter frame sync

direction (TFSD) bit in the ESAI transmit clock control register (TCCR).

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