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YMF724F
DS-1
YAMAHA
CORPORATION
September 21, 1998
Preliminary
OVERVIEW
YMF724F (DS-1) is a high performance audio controller for the PCI Bus. DS-1 consists of two separated
functional blocks. One is the PCI Audio block and the other is the Legacy Audio block. PCI Audio block
allows Software Driver to handle maximum of 73 concurrent audio streams with the Bus Master DMA engine.
The PCI Audio Engine converts the sampling rate of each audio stream and the streams are mixed without
utilizing the CPU or causing system latency. By using the Software Driver from YAMAHA, PCI Audio
provides 64-voice XG wavetable synthesizer with Reverb and variation. It also supports DirectSound hardware
accelerator, Downloadable Sound (DLS) and DirectMusic accelerator.
Legacy Audio block supports OPL3, Sound Blaster Pro, MPU401 UART mode and Joystick function in order
to provide hardware compatibility for numerous PC games on real DOS without any software driver. To
achieve legacy DMAC compatibility on the PCI, DS-1 supports both PC/PCI and Distributed DMA protocols.
DS-1 also supports Serialized IRQ for legacy IRQ compatibility.
DS-1 supports the connection to YAMAHA YMF730 (AC-2) which provides high quality DAC, ADC and
analog mixing. In addition, it supports consumer IEC958, Audio Digital Interface (SPDIF) output, for high-
quality, external audio amplification.
FEATURES
• PCI 2.1 Compliant
• PC’97/PC’98 specification Compliant
• PCI Bus Power Management rev. 1.0 Compliant
(Support D0, D2 and D3 state)
• PCI Bus Master for PCI Audio
True Full Duplex Playback and Capture with
different Sampling Rate
Maximum 64-voice XG capital Wavetable
Synthesizer including GM compatibility
DirectSound Hardware Acceleration
DirectMusic Hardware Acceleration
Downloadable Sound (DLS) level-1
• Legacy Audio compatibility
Genuine OPL3
Hardware Sound Blaster Pro compatibility
MPU401 UART mode MIDI interface
Joystick
• Supports PC/PCI and Distributed DMA for legacy
DMAC (8237) emulation
• Supports Serialized IRQ
• Supports YAMAHA AC-3 device (YMF727 :
AC3F2) interface to enable AC-3 decode
• Supports Consumer IEC958 Output (SPDIF) port
• Supports AC-2 Interface (AC-Link)
• Hardware Volume Control
• EEPROM Interface
• Single Crystal operation (24.576MHz)
• 5V Power supply for I/O. 3.3V Power supply for
Internal core logic
• 144-pin LQFP (YMF724F-V)
The contents of this catalog are target specifications and are subject to change
without prior notice. When using this device, please recheck the specifications.