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

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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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Contents Preliminary FeaturesOverview GM system level LogosSensaura February 3YMF744B-V 0.5mm pin pitch PIN ConfigurationYMF744B-R 0.4mm pin pitch PCI Bus Interface 54-pin PIN DescriptionAC’97 Interface 8-pin Legacy Device Interface 15-pin External Audio Interface 5-pinMiscellaneous 11-pin Reserve Pin 13-pin Power Supply 22-pinPC/PCI IRQ Block DiagramTarget Device Mode PCI Bus CommandMaster Device Mode Function Overview5C-5Fh PCI Configuration Register00-01h Vendor ID 04-05h Command02-03h Device ID 06-07h Status 09h Programming Interface 08h Revision ID0Ah Sub-class Code 0Bh Base Class Code0Eh Header Type 0Dh Latency Timer10-13h PCI Audio Memory Base Address B0................IO Read Only 18-1Bh Legacy Audio I/O Base Address Dummy for Joystick2E-2Fh Subsystem ID 2C-2Dh Subsystem Vendor IDB150 ........Subsystem Vendor ID B150 ........Subsystem ID3Ch Interrupt Line 34h Capability Register Pointer3Dh Interrupt Pin 3Eh Minimum Grant40-41h Legacy Audio Control 3Fh Maximum LatencyB5................I/O I/O Address Aliasing Control B4................MIEN MPU401 IRQ EnableB76 ..........SDMA Sound Blaster DMA-8 Channel Select B108 ........SBIRQ Sound Blaster IRQ Channel SelectB1211 ......SMOD SB DMA mode B14..............SIEN Serialized IRQ enable42-43h Extended Legacy Audio Control B8................MAIM MPU401 Acknowledge Interrupt Mask46-47h Subsystem ID Write Register 44-45h Subsystem Vendor ID Write RegisterCrst AC’97 Software Reset Signal Control Read / Write Default 0001h Access Bus Width 8, 16, 32-bitWrst AC’97 Warm Reset 48-49h DS-1S Control4A-4Bh DS-1S Power Control 4C-4Dh D-DMA Slave Configuration 4E-4Fh DS-1S Power Control Psio Power Save I/O Pad Psacl Power Save AC-LinkB12 B70 ..........Capability ID Capability Identifier 50h Capability ID54-55h Power Management Control / Status 52-53h Power Management Capabilities51h Next Item Pointer 5A-5Bh DS-1S Secondary AC’97 Power Control 58-59h Acpi Mode62-63h Sound Blaster Base Address 60-61h FM Synthesizer Base Address66-67h Joystick Base Address 64-65h MPU401 Base AddressB151 ........MPU401 Base Address B150 ........Joystick Base AddressISA Compatible Device DS-1S Status Register FM Synthesizer BlockFM Synthesizer Status Register RO FM Synthesizer Data Register Array 0 R/W FM Synthesizer Data RegisterFM Synthesizer Data Register Array 1 R/W Sound Blaster Pro Block CMD DSP CommandSB Mixer DSP Sound Blaster Pro MixerSB Mixer AC’97 Volume for MidiSE Scan Enable B0................SBPDR Sound Blaster Power Down RequestSM Scan Mode Sbpda Sound Blaster Power Down AcknowledgementF2h Current FM Synthesizer Index F1h Scan In/ Out DataF3h Current FM Synthesizer Array F4h FM Synthesizer / MPU401 StatusFfemp FM Synthesizer Empty MPU401 F8h Interrupt Flag RegisterJoystick SB IRQ StatusPC/PCI DMA Emulation ProtocolDMA Serialized IRQ Interrupt RoutingHardware Volume Control Spdif Digital Audio InterfaceSclk Data Lrck Zoomed Video PortAC’97 Digital Docking Multiple AC’97 & Multi-ChannelChannel Speaker System Absolute Maximum Ratings Electrical CharacteristicsRecommended Operating Conditions DC Characteristics Reset AC CharacteristicsMaster Clock PCI Clock timing PCI InterfaceMaster Clock timing for AC’97 AC’97 Master ClockAC-link timing AC-linkZoomed Video Port timing Zoomed Video PortUnit mm February 3 External DimensionsYMF744B-R Yamaha Corporation

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.
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