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PDF ( 数据手册 , 数据表 ) YMF721

零件编号 YMF721
描述 FM + Wavetable Synthesizer LSI
制造商 LSI Computer Systems
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YMF721 数据手册, 描述, 功能
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 CJuATlyAL1O0G, 1997
CATALOG No.:LSI-4MF721A20
Jury 10, 1997







YMF721 pdf, 数据表
YMF721
1-2. System without MPU401 UART
This section describes an example of a system that does not have MPU401 UART in it.
In this example, MPU401 UART of YMF721 (OPL4-ML2) is used.
FM synthesizer of this LSI is compatible with applications that support AdLib/Sound Blaster, and Wavetable
synthesizer is compatible with applications that support MPU401.
SA15-0
AEN
Lch out
Rch out
Lch
Rch
/OPLCS
/MPUCS
FSP
RXD
/PDIN
MCLK /PDOUT
BCLK CLKO
LRCK BCO
SDATA LRO
DO2
ARDY
RESET
A2-0
/IOW
/IOR
ADB7-0
ABDIR
IOCHRDY
RESETDRV
SA2-0
/IOW
/IOR
SD7-0
Note :
For the above case, MPU401 port of YMF721 (OPL4-ML2) must be made active because the system does not
have MPU401 UART in it. Addresses of standard ports through which reading or writing of registers of
YMF721 (OPL4-ML2) is made are as follows.
1) /OPLCS
: 388 - 38Fh (8byte)
2) /MPUCS
: 330 - 331h (2byte)
As a source of master clock for YMF721 (OPL4-ML2), use a crystal oscillator by connecting it to XI and
XO pins, or use the clock of 33.8688 MHz from the system. Connect BCO, LRO, DO2, /PDOUT and
CLKO directly to YAC516 (DAC16-L) as shown to convert serial data output to analog signal. Then, it is
recommended to amplify the volume of source of YMF721 through the suitable gain as shown for the
purpose of equalizing the volumes of multiple sources.
- 8 - July 10, 1997







YMF721 equivalent, schematic
YMF721
6-3-2. Resume
Command and Response have the following formats.
Command
E1h
0x00
data_0
..........
data_n
checksum
Command byte
Sub Command
data
.......
last data
checksum
Response
None
For Resume, data following the sub command are transmitted as seven bit data. Thus, it is necessary
to send the data obtained with suspend command to the internal processor after encoding it.
Checksum is determined so that the result of logical product (AND) of 7Fh and the sum of sub
command byte, encoded data and checksum becomes "0". The internal processor returns to the state
immediately before execution of Command E0h when it confirms that the data has been received
normally.
6-3-3. Others
YMF721(OPL4-ML2) can use the following special commands that do not send response.
1) Command FDh : Power down mode
Refer to 5-1.
When the power down command FDh has been written into the command register, do not write
any command before the return command to the control register has been executed.
2) Command FEh : Checking operating state of internal processor
This command is used to check if the internal processor is operating normally.
The internal processor is deemed operating normally if GBUSY bit of Status register is "0".
3) Command FFh : Discontinuing command execution
This command is used to discontinue the execution of a command. This command can be used
only when another command is being executed.
- 16 -
July 10, 1997










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