DSP56600FMSLASHAD datasheet(38/76 Pages) NXP

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Preliminary

1-32

DSP56651 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56651 Signal Description

Baseband Codec Port

After reset, the default state of the baseband codec port pins is Hi-Z. For baseband

codec port signals equipped with resistors, all pull-ups and pull-downs are

automatically disconnected when the pin is an output.

SC2A

Input or

Output

Input

Audio codec serial clock 2—

This signal’s function is determined by

the SCLK mode.

•

Synchronous mode—transmitter and receiver frame sync I/O

•

Asynchronous mode—transmitter frame sync I/O

It is equipped with a 100k

Ω pull-down resistor.

This is a GPIO signal when SC2A is not being used.

Note:

This signal is disabled if the alternate SC2A function on

ROW6 is selected. (See Table 1-14 on page 1-22.)

Table 1-19

Baseband Codec Port Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

STDB

Output

Input or

Output

Input

Baseband codec transmit data

— This output signal transmits serial

data from the baseband codec serial transmitter shift register. This

signal is equipped with a 100 pull-up resistor.

This is a GPIO signal when STDB is not being used.

SRDB

Input

Input or

Output

Input

Baseband codec receive data

— This input signal receives serial

data and transfers the data to the baseband codec receive shift

Ω pull-down resistor.

This is a GPIO signal when SRDB is not being used.

SCKB

Input or

Output

Input

Baseband codec serial clock

— This bidirectional signal provides

the serial bit rate clock when only one clock is being used or the TxD

clock otherwise. This signal is equipped with a 100k

Ω pull-down

resistor. This is a GPIO signal when the serial baseband codec port

is not being used.

Table 1-18

Serial Audio Codec Port Signals (Continued)

Signal Name

Signal

Type

State

during

Reset

Signal Description

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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