Yamaha YMF744B (DS-1S) specifications ISA Compatible Device

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YMF744B

2. ISA Compatible Device

DS-1S contains the following functions to maintain the compatibility with the past ISA Sound Devices. These devices are considered Legacy devices and the functions are referred to as Legacy Audio.

Legacy Audio is independent from PCI Audio and can be used simultaneously.

The configuration is set in the Legacy Audio Control Register in the PCI Configuration Register space. Basically, these registers are configured by the BIOS.

Also, logical device IDs are assigned to the devices to support Plug and Play. Yamaha defines the following logical IDs.

To control the device with the BIOS, the logical device IDs must be defined in the PnP BIOS extended ROM space. The logical IDs are determined by how it is configured. IDs and configuration are as follows.

 

Logical Device ID

 

Functions used (Block)

 

 

FM(*)

MPU401

SB Pro (*)

Joystick

 

 

 

 

 

YMH0100

O

O

O

 

 

 

YMH0101

 

 

 

O

* The blocks pertain to the following.

 

 

 

FM:

Points to the FM synthesizer mapped to AdLibBase (0x0388).

 

SB Pro:

Points to the Voice Playback section only.

 

 

These devices are independent from each other, and can be Enabled/Disabled individually. However, both AdLib and Sound Blaster must be disabled to disable the internal FM Synthesizer. Disabling just AdLib only masks the access.

The driver by Yamaha supports only logical device ID, YMH0100. For YMH0101, use the driver provided by Microsoft.

February 3, 1999

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Contents Overview FeaturesPreliminary Logos GM system levelSensaura February 3PIN Configuration YMF744B-V 0.5mm pin pitchYMF744B-R 0.4mm pin pitch AC’97 Interface 8-pin PIN DescriptionPCI Bus Interface 54-pin Miscellaneous 11-pin External Audio Interface 5-pinLegacy Device Interface 15-pin Power Supply 22-pin Reserve Pin 13-pinBlock Diagram PC/PCI IRQPCI Bus Command Target Device ModeMaster Device Mode Function OverviewPCI Configuration Register 5C-5Fh02-03h Device ID 04-05h Command00-01h Vendor ID 06-07h Status 08h Revision ID 09h Programming Interface0Ah Sub-class Code 0Bh Base Class Code10-13h PCI Audio Memory Base Address 0Dh Latency Timer0Eh Header Type 18-1Bh Legacy Audio I/O Base Address Dummy for Joystick B0................IO Read Only2C-2Dh Subsystem Vendor ID 2E-2Fh Subsystem IDB150 ........Subsystem Vendor ID B150 ........Subsystem ID34h Capability Register Pointer 3Ch Interrupt Line3Dh Interrupt Pin 3Eh Minimum Grant3Fh Maximum Latency 40-41h Legacy Audio ControlB4................MIEN MPU401 IRQ Enable B5................I/O I/O Address Aliasing ControlB76 ..........SDMA Sound Blaster DMA-8 Channel Select B108 ........SBIRQ Sound Blaster IRQ Channel SelectB14..............SIEN Serialized IRQ enable B1211 ......SMOD SB DMA mode42-43h Extended Legacy Audio Control B8................MAIM MPU401 Acknowledge Interrupt Mask44-45h Subsystem Vendor ID Write Register 46-47h Subsystem ID Write RegisterRead / Write Default 0001h Access Bus Width 8, 16, 32-bit Crst AC’97 Software Reset Signal ControlWrst 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 B12 Psacl Power Save AC-LinkPsio Power Save I/O Pad 50h Capability ID B70 ..........Capability ID Capability Identifier51h Next Item Pointer 52-53h Power Management Capabilities54-55h Power Management Control / Status 58-59h Acpi Mode 5A-5Bh DS-1S Secondary AC’97 Power Control60-61h FM Synthesizer Base Address 62-63h Sound Blaster Base Address64-65h MPU401 Base Address 66-67h Joystick Base AddressB151 ........MPU401 Base Address B150 ........Joystick Base AddressISA Compatible Device DS-1S FM Synthesizer Status Register RO FM Synthesizer BlockStatus Register FM Synthesizer Data Register Array 1 R/W FM Synthesizer Data RegisterFM Synthesizer Data Register Array 0 R/W Sound Blaster Pro Block DSP Command CMDSound Blaster Pro Mixer SB Mixer DSPVolume for Midi SB Mixer AC’97B0................SBPDR Sound Blaster Power Down Request SE Scan EnableSM Scan Mode Sbpda Sound Blaster Power Down AcknowledgementF1h Scan In/ Out Data F2h Current FM Synthesizer IndexF3h Current FM Synthesizer Array F4h FM Synthesizer / MPU401 StatusFfemp FM Synthesizer Empty F8h Interrupt Flag Register MPU401Joystick SB IRQ StatusDMA Emulation Protocol PC/PCIDMA Interrupt Routing Serialized IRQHardware Volume Control Digital Audio Interface SpdifZoomed Video Port Sclk Data LrckChannel Speaker System Multiple AC’97 & Multi-ChannelAC’97 Digital Docking Recommended Operating Conditions Electrical CharacteristicsAbsolute Maximum Ratings DC Characteristics Master Clock AC CharacteristicsReset PCI Interface PCI Clock timingAC’97 Master Clock Master Clock timing for AC’97AC-link AC-link timingZoomed Video Port Zoomed Video Port timingExternal Dimensions Unit mm February 3YMF744B-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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