DSP56004ROM 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.

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