DSP56004UMSLASHAD datasheet(19/82 Pages) FREESCALE

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Signal/Connection Descriptions

Serial Audio Interface (SAI)

MOTOROLA

DSP56004/D, Rev. 3

1-13

SERIAL AUDIO INTERFACE (SAI)

The SAI is composed of separate receiver and transmitter sections.

SAI Receiver Section

Table 1-9

Serial Audio Interface (SAI) Receiver signals

Signal

Name

Signal

Type

State during

Reset

Signal Description

SDI0

Input

Tri-stated

Serial Data Input 0

—While in the high impedance

state, the internal input buffer is disconnected from

the pin and no external pull-up is necessary. SDI0 is

the serial data input for receiver 0.

Note:

This signal is high impedance during hardware or

software reset, while receiver 0 is disabled

(R0EN = 0), or while the DSP is in the Stop state.

SDI1

Input

Tri-stated

Serial Data Input 1

—While in the high impedance

state, the internal input buffer is disconnected from

the pin and no external pull-up is necessary. SDI1 is

the serial data input for receiver 1.

Note:

This signal is high impedance during hardware or

software reset, while receiver 1 is disabled

(R1EN = 0), or while the DSP is in the Stop state.

SCKR

Input or

Output

Tri-stated

Receive Serial Clock

—SCKR is an output if the

receiver section is programmed as a master, and a

Schmitt-trigger input if programmed as a slave. While

in the high impedance state, the internal input buffer

is disconnected from the pin and no external pull-up is

necessary.

Note:

SCKR is high impedance if all receivers are

disabled (individual reset) and during hardware or

software reset, or while the DSP is in the Stop state.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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