YMU757B 데이터 시트보기 (PDF) - Yamaha Corporation

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YMU757B

MA-1C

Yamaha Corporation 

YMU757B

Block description

1) Serial interface

When the serial interface receives the serial data, it identifies the index data and transmits the control data to each

function block.

2) FIFO

The musical score data are stored temporarily in FIFO which can contain up to 32 musical score data. The musical

score data are processed are processed in the sequencer when they are generated as sounds and those that have been

processed are deleted one after another. When the remaining data amount in FIFO reaches the register setting (IRQ

point) or less, it outputs an interrupt signal to ask for the continuing musical score data to be fed.

3) Sequencer

When the sequencer receives the START command, it starts to read the musical score data which have been stored in

FIFO. The processed musical score data are deleted.

4) Timbre register (Index 10h~2Fh)

The timbre data are stored in this register which can contain up to 8 timbres. Settings for this register must be made

before sound generation. Though it is initialized by hardware resetting, contents of a register aren't cleared, and the

value which had light last time is held as for the following.

• Software reset (CLR bit of Index32h)

• After the inside of the power going down mode and a release.

5) FM synthesizer

The timbres are synthesized and generated according to settings. Four sounds can be generated at the same time.

6) D/A, volume and amplifier

The outputs from the synthesizer are D/A converted and volume processed. After that, they are output from the

speaker or the earphone out terminal.

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