MSM9844 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9844

VOICE SYNTHESIS LSI with on-chip FIFO Memory

Oki Electric Industry 

¡ Semiconductor

MSM9844

• Playback Operation When Micro-controller Interface in Use

(1) Define a synthesis algorithm, sampling frequency, bus width, playback mode, and etc. as required, by

using an appropriate command.

(2) To start playback, input the PLAY command. Or, write one word data to FIFO, letting the LSI ready for

playback, and turn the EMP pin to “L” to initiate playback.

(3) Status shifting indicated by the EMP and FUL pins

(EMP=”L”, MID=”L”, FUL=”L”)

Indicates the state where no one-word data is written to FIFO memory.

(EMP=”H”, MID=”L”, FUL=”L”)

Indicates the state where one-word or more data is written to FIFO memory.

(EMP=”L”, MID=”H”, FUL=”L”)

Indicates the state where data is written to more than half of FIFO memory.

(EMP=”L”, MID=”H”, FUL=”H”)

Indicates the state where FIFO memory is full.

(4) Ending playback

When a write cycle is not completed within pre-fixed time, the LSI deems it as a completed write cycle and

ends playback.

• FIFO Memory's Status Shift

: Empty Block

: Write Done Block

: Block Being Read

EMP=H

MID =L

FUL =L

EMP=L

MID =L

FUL =L

EMP=L

MID =H

FUL =L

EMP=L

MID =H

FUL =H

EMP=L

MID =L

FUL =L

EMP=L

MID =L

FUL =L

EMP=H

MID =L

FUL =L

Start Playback

Playing Back

End Playback

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