YMF721 datasheet(20/41 Pages) LSI

Part #	YMF721

Description	FM Wavetable Synthesizer LSI

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Manufacturer	LSI [LSI Computer Systems]

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YMF721

July 10, 1997

- 20 -

6-6. Wavetable synthesizer register

6-6-1. Status register

Status Register (RO):

port

D7D6D5D4D3D2D1D0

OPL_Base + 4

------

LD

BUSY1

6-6-2. Data register

Data Register (R/W):

Index

D7

D6

D5

D4

D3

D2

D1

D0

00 - 01h

LSI TEST

02h

DEVICE ID (“0” “1” “0”)

TONE HEADER

MTYPE

MODE

03h

Memory Address (MA21-16)

04h

Memory Address (MA15-8)

05h

Memory Address(MA7-0)

06h

Memory Data(MD7-0)

08-1Fh

TONE NUMBER (L)

20-37h

F-NUMBER (L)

TNUM (H)

38-4Fh

BLOCK

50-67h

TOTAL LEVEL

LDIR

68-7Fh

KEYON

DAMP

LFORST

CH

PAN POT

80-97h

CHORUS SEND

LFO

VIB

98-AFh

AR

D1R

B0-C7h

DL

D2R

C8-DFh

RATE INTERPOLATION

RR

E0-F7h

REVERB SEND

-

AM

F8h

-

MIX CONTROL (FM-R)

MIX CONTROL (FM-L)

F9h

-

MIX CONTROL (Wave-R)

MIX CONTROL (Wave-L)

FAh

---

--

ATC

FBh

---

--

---

Default :

After initial clear, index 02h becomes 40h (Device ID) and index F8h becomes 2Dh (-15dB), and all

the other registers are cleared to "0". For the details of these registers, refer to data sheet for

YMF295(OPL4-D).

Note :

BUSY1 is a BUSY flag for Wavetable registers. Wavetable status/Data register is normally accessed

by the internal processor.

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YMF721 Datasheet(PDF) 20 Page - LSI Computer Systems

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