Yamaha YMF744B (DS-1S) specifications Preliminary, Overview, Features

Models: YMF744B (DS-1S)

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YMF744B

DS-1S

Preliminary

OVERVIEW

YMF744B (DS-1S) is a high performance audio controller for the PCI Bus. DS-1S 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 FM Synthesizer, 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-1S supports both PC/PCI and Distributed DMA protocols. DS-1S also supports Serialized IRQ for legacy IRQ compatibility.

DS-1S supports the connection to AC’97 which provides high quality DAC, ADC and analog mixing, and it can connect two AC’97s. In addition, it supports consumer IEC958, Audio Digital Interface (SPDIF), to connect external audio equipment by digital.

FEATURES

PCI 2.2 Compliant

PC’98/PC’99 specification Compliant

PCI Bus Power Management rev. 1.0 Compliant (Support D0, D2 and D3 state)

Supports clock run

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 FM Synthesizer

Hardware Sound Blaster Pro compatibility MPU401 UART mode MIDI interface Joystick

Supports Serialized IRQ

Supports PC/PCI and Distributed DMA for legacy DMAC (8237) emulation

Supports I 2S serial input for Zoomed Video Port

Supports Consumer IEC958 Output (SPDIF OUT)

Supports Consumer IEC958 Input (SPDIF IN)

Supports AC’97 Interface (AC-Link) Revision 2.1

AC’97 Digital Docking

Supports 4-Channel Speaker

Hardware Volume Control

EEPROM Interface

Single Crystal operation (24.576MHz)

3.3V Power supply (5V tolerant)

128-pin LQFP YMF744B-V : 0.5mm pin pitch YMF744B-R : 0.4mm pin pitch

The contents of this catalog are target specifications and are subject to change without prior notice. When using this device, please recheck the specifications.

YAMAHA CORPORATION

YMF744B CATALOG

CATALOG No.:LSI-4MF744B00

February 3, 1999

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Yamaha YMF744B (DS-1S) specifications Preliminary, Overview, Features

YMF744B (DS-1S) specifications

The Yamaha YMF744B, also known as the DS-1S, is a popular audio chip that emerged in the late 1990s, particularly known for its use in sound cards for PCs. This sound processor exemplifies Yamaha's commitment to delivering high-quality audio through innovative technology and user-friendly features.

One of the standout features of the YMF744B is its ability to support advanced sound synthesis methods, including wave table synthesis and sample playback. These technologies provide users with a rich audio experience, enabling high-fidelity sounds reminiscent of live instruments. The chip is also notable for its ability to emulate MIDI instruments, allowing musicians to create synthesized music that captures the nuances of traditional sounds.

The YMF744B integrates a 16-bit DAC (Digital-to-Analog Converter), which facilitates high-quality audio playback with a sampling rate of up to 48 kHz. This capability ensures that sound reproduction remains clear and devoid of distortion, appealing to both casual users and audio professionals alike. Additionally, the chip supports multiple audio channels, making it ideal for gaming and multimedia applications where spatial audio is crucial.

Another significant feature of the YMF744B is its support for various audio formats, including PCM (Pulse Code Modulation), ADPCM (Adaptive Differential Pulse Code Modulation), and even MIDI. The versatility in format support allows users to interact with a broad spectrum of audio applications, from game design to music production.

The chip also comes with integrated Sound Blaster Pro compatibility, which significantly enhances its usability with a vast array of software and games designed during the 1990s and early 2000s. This compatibility is crucial for retro gaming enthusiasts who seek an authentic audio experience with classics from the past.

Moreover, the YMF744B champions power efficiency, making it an attractive choice for mobile computing platforms. Its low power consumption means that it can be effectively used in laptops without significantly draining battery life, allowing users to enjoy high-quality sound on the go.

In summary, the Yamaha YMF744B (DS-1S) stands out due to its advanced audio synthesis capabilities, high-quality playback features, and compatibility with multiple formats. These attributes make it a favored choice in the audio processing domain, continuing to impact computer audio technology long after its initial release.