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参数资料
| 型号： | YMF721 |
| 厂商： | LSI Corporation |
| 英文描述： | FM + Wavetable Synthesizer LSI |
| 中文描述： | 调频波形表合成器大规模集成电路 |
| 文件页数： | 39/41页 |
| 文件大小： | 324K |
| 代理商： | YMF721 |
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YMF721
July 10, 1997
- 7 -
(2) No ISA BUS Connect System
Note :
YMF721 (OPL4-ML2) has MPU401 UART in it. Thus, for the above case, TXD of YMF7xx (OPL3-SAx)
is connected with RXD of YMF721 (OPL4-ML2) and MPU401 port (/MPUCS) of YMF721 (OPL4-ML2)
is disabled so that YMF7xx(OPL3-SAx) sends MIDI data directly to YMF721 (OPL4-ML2).
The above system does not connect YMF721 (OPL4-ML2) and ISA bus, which is an example of Wavetable
upgrade solution represented by the Wavetable daughter card. Input pins of the ISA bus interface should be
pulled up externally. At this time, FM synthesizer/Command/Control ports are disabled, but the power
down function is enabled by receiving System Exclusive Message on the MIDI data, except that
Suspend/Resume function is disabled.
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 input the converted analog signal to AUX2L and AUX2R of YMF7xx (OPL3-SAx) after
amplifying the volume of source of YMF721 through the gain of +12 dB as shown for the purpose of
equalizing the volumes of multiple sources.
YMF7xx
(OPL3-SAx)
RESET
TXD
Lch
AUX2L
Rch
AUX2R
LRCK
MCLK
/PDIN
BCLK
SDATA
ARDY
RST
A2-0
/IOW
/IOR
ADB7-0
ABDIR
X
I
XO
/OPLCS
/MPUCS
FSP
RXD
/PDOUT
CLKO
BCO
LRO
DO2
YMF721
(OPL4
-ML2
)
YAC516
G
ain
(
+
12dB)
相关PDF资料 |
PDF描述 |
|---|---|
| YMF724F-V | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| YMF724 | high performance audio controller for the PCI Bus |
| YMF724F | high performance audio controller for the PCI Bus |
| YMF724F-V | high performance audio controller for the PCI Bus |
| YMF740C | DS-1L |
相关代理商/技术参数 |
参数描述 |
|---|---|
| YMF724 | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
| YMF724F | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
| YMF724F-V | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
| YMF740C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DS-1L |
| YMF740CV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
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