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参数资料
| 型号： | YMF721-S |
| 元件分类： | 音频合成 |
| 英文描述： | SPEECH SYNTHESIZER, PQFP100 |
| 封装： | SQFP-100 |
| 文件页数： | 41/41页 |
| 文件大小： | 324K |
| 代理商： | YMF721-S |
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YMF721
July 10, 1997
- 9 -
2. ISA bus interface
8 bit parallel I/O of YMF721 (OPL4-ML2) can be connected with ISA bus. The ISA bus interface allows
transfer of commands between the each block of YMF721 (OPL4-ML2) and host.
Data Bus & Address Bus
ADB7-0
: ISA data bus
A2-0
: ISA address bus
/MPUCS
: MPU401 chip select
/OPLCS
: FM/Wavetable/Command/Control chip select
/IOW
: ISA write enable
/IOR
: ISA read enable
ABDIR
: Data bus direction switching (“L” : YMF721
ISA)
ARDY
: I/O channel ready (“L” : busy)
Control of the data bus is made with /MPUCS, /OPLCS, /IOW and /IOR signals. The mode of
control of the data bus varies as follows according to the combination of states of the signals.
The direction of data transfer on the data bus is determined by ABDIR. In normal operation, the
internal data bus of YMF721 (OPL4-ML2) connects the built-in processor and FM/Wavetable
synthesizer blocks. Every time the ISA bus accesses the register for FM/Wavetable, an internal
arbitration circuit causes the internal bus to connect ISA bus and FM/Wavetable synthesizer
blocks. YMF721 (OPL4-ML2) uses I/O channel ready (ARDY pin) as the internal arbitration
circuit. ARDY becomes "L" (busy) every time data bus accesses the register for FM/Wavetable.
/MPUCS /OPLCS
/IOW
/IOR
A2
A1
A0
MODE
LH
H
L
L
MPU401 Acknowledge (FEh)
LH
L
MPU401 MIDI Data write
LH
H
L
L
H
MPU401 Status read
LH
L
H
MPU401 Command write
H
L
H
LLLL
FM-synth. Status read
H
L
H
L
H/L
L
FM-synth. Address write
HL
L
H
L
H
FM-synth. Data write
HL
L
H
FM-synth. Data read
H
L
H
L
H
L
Wavetable-synth. Status read
H
L
H
L
Wavetable-synth. Address write
H
L
H
L
H
Wavetable-synth. Data write
H
L
H
L
H
L
H
Wavetable-synth. Data read
HL
H
L
Command response read
H
L
HHH
L
Command write
H
L
HHHH
Control write
H
L
H
L
H
Status read
HL
H
No-active or UART mode
HH
No-active or UART mode
相关PDF资料 |
PDF描述 |
|---|---|
| YMF721 | FM + Wavetable Synthesizer LSI |
| 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 |
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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