YMF721
OPL4-ML2
FM + Wavetable Synthesizer LSI
OVERVIEW
YMF721 (OPL4-ML2) is a high quality and low cost Wavetable synthesizer LSI. YMF721 (OPL4-ML2)
integrates an OPL3 (FM synthesizer), General MIDI processor and 1 Mbyte Wavetable sample ROM into one
chip, and complies with General MIDI (GM) system level 1. Thus, it is best suited to multimedia applications,
sound cards, MIDI synthesis modules and other sound applications.
Since this LSI outputs stereophonic 16 bit digital signal (fs = 44.1 kHz), it can be connected directly with
YMF701B, 711 or 715 (OPL3-SA, SA2 or SA3) or with YAC516(DAC16-L).
Operating voltage, 3.3 V, allows this LSI to be controlled with notebook personal computers.
Power management functions (power down and suspend/resume functions) of OPL4-ML2 contribute to low
power consumption of personal computers into which this product is built-in.
FEATURES
• The Wavetable synthesizer of this LSI is able to generate up to 24 types of sounds simultaneously.
• Has an interface that makes this LSI compatible with MPU-401 UART mode.
• Has an OPL3 (FM synthesizer) for AdLib/Sound Blaster applications.
• Has a 1 Mbyte built-in Wavetable sample ROM.
• Complies with GM system Level 1. (Thus, it is compatible with DOS applications that support MPU-401.)
• MIDI signal can be transmitted either through serial input or parallel input.
• FM synthesizer and Wavetable synthesizer of this LSI can generate their sound at the same time.
• FM synthesizer is register-compatible with OPL3.
• All registers are readable.
• Power management functions included power down and suspend/resume can be supported.
• Frequency of master clock signal is 33.8688 MHz.
• Pin compatible with YMF704C-S (100 pin SQPF)
• Voltage of power supply can be 5.0 V or 3.3 V.
• Silicone gate CMOS process
• 100-pin SQFP (YMF721-S).
GENERAL MIDI logo is a trademark of Association of Musical Electronics Industry (AMEI), and
indicates GM system level 1 Compliant.
YAMAHA CORPORATION
YMF721 CATALOG
1997
July 10,
CATALOG No.:LSI-4MF721A20
Jury 10, 1997
YMF721
PIN DESCRIPTION
ISA bus interface : 19 pins
Pin name
ADB7-0
A2-0
/MPUCS
/OPLCS
/IOW
/IOR
RST
AIRQ
ABDIR
ARDY
MIDI interface : 2 pins
Pin name
RXD
FSP
pins
1
1
I/O
I
I
Type
TTL
TTL
Size
-
-
Function
MIDI serial data input
Selection of MIDI serial/parallel transmission
(“H” : Parallel, “L” : Serial)
pins
8
3
1
1
1
1
1
1
1
1
I/O
I/O
I
I
I
I
I
I
O
O
OD
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
Size
2mA
-
-
-
-
-
-
2mA
2mA
12mA
Function
Data bus
Address bus
MPU401 chip select
FM/Wavetable/Command/Control chip select
Write enable
Read enable
Initial clear input
Interrupt signal ("H" : Interrupt)
Selection of data transfer direction
(“L” : YMF721®Host)
I/O channel ready/busy selection ("L" : Busy)
Serial audio interface : 8 pins
Pin name
CLKO
BCO
LRO
WCO
DO3
DO2
DO1
DO0
pins
1
1
1
1
1
1
1
1
I/O
O
O
O
O
O
O
O
O
Type
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
Size
8mA
2mA
2mA
2mA
2mA
2mA
2mA
2mA
Function
Clock output (384fs = 16.9344MHz)
Bit clock output (48fs = 2.1168MHz)
L/R clock output (fs = 44.1kHz)
Word clock output (2fs = 88.2kHz)
Effect send output
MIX (FM + Wavetable) output
Wavetable output
FM output
-3-
July 10, 1997
YMF721
Others : 39 pins
Pin name
5V/3V
/RESETSEL
/PDOUT
XI
XO
N.C.
LSI test pins : 21 pins
Pin name
/TESTA
/TESTB
/TEST
/TEST2
/TEST3
T7-0
TD7-0
pins
1
1
1
1
1
8
8
I/O
I+
I+
I+
I+
I+
O
I/O
Type
TTL
TTL
TTL
TTL
TTL
CMOS
CMOS
Size
-
-
-
-
-
2mA
2mA
Function
To be open at normal use.
To be open at normal use.
To be open at normal use.
To be open at normal use.
To be open at normal use.
To be open at normal use.
To be open at normal use.
pins
1
1
1
1
1
34
I/O
I
I+
O
I
O
-
Type
CMOS
TTL
CMOS
CMOS
CMOS
-
Size
-
-
2mA
2mA
2mA
-
Function
Selection of power supply
RST signal polarity control pin
(When this pin is at "L", RST is active at "L".)
Power down control output
Crystal oscillator connection or master clock input
(33.8688 MHz)
Crystal oscillator connection pin
To be open at normal use.
Power supply, ground : 11 pins
Pin name
VDD
VSS
Total : 100 pins
pins
4
7
I/O
-
-
Type
-
-
Size
-
-
Function
Power supply (put on +5.0 V or +3.3V)
Ground
Note : I+ : Input pin with built-in pull-up resistor, OD : Open drain output pin
-4-
July 10, 1997
京公网安备 11010802033920号
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