DSP56374 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56374

24-Bit Audio Digital Signal Processor

Motorola => Freescale 

Signal Groupings

Table 10. Enhanced Serial Audio Interface Signals (Continued)

Signal Name Signal Type

HCKT

Input or output

PC5

Input, output, or

disconnected

State during

Reset

Signal Description

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.

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.

FSR

Input or output

This pin has an internal pull up resistor.

This input is 5 V tolerant.

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).

PC1

Input, output, or

disconnected

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.

Port C1—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

PRELIMINARY

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