Yamaha YMF744B (DS-1S) 48-49h DS-1S Control, Crst AC’97 Software Reset Signal Control

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YMF744B

48-49h: DS-1S Control

Read / Write

Default: 0001h

Access Bus Width: 8, 16, 32-bit

 

 

b15

b14

 

b13

b12

 

b11

b10

 

b9

b8

 

b7

 

b6

b5

b4

b3

b2

B1

 

b0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

-

 

-

-

 

-

-

 

-

-

 

-

 

-

-

-

ACLS

WRST

-

 

CRST

b0

................CRST: AC’97 Software Reset Signal Control

 

 

 

 

 

 

 

 

 

 

This bit controls the CRST# signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“0”: Inactive (CRST#=High)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“1”: Active (CRST#=Low)

 

(default)

 

 

 

 

 

 

 

 

 

 

 

 

b2

................WRST: AC’97 Warm Reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This bit places the AC’97 in warm reset condition when the BIT_CLK signal on the AC’97 remains in

 

 

inactive state. If this bit is set to “1”, it will automatically return to “0” after 1.3µs time duration. This

 

 

 

bit is valid only while the ACLS bit is set to “0”. Except in this case, even if this bit is attempted to be

 

 

 

set to “1”, no warm reset will be generated (write operation of “1” remains disabled).

 

 

 

 

 

 

 

“0”: Normal

 

(default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“1”: AC’97 Warm Reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b3

................ACLS: AC-Link Status

(Read Only)

 

 

 

 

 

 

 

 

 

 

This bit indicates whether or not the AC-link is active. This bit is “1” when the AC-link remains in active state (the BIT_CLK signal is active). This bit is “0” during the following conditions:

-When the CRST# pin is active (CRST#=Low)

-When either the PR4 bit or PR5 bit of 4A-4Bh: DS-1S Power Control 1 register is set to “1”

“0”: AC’97

Inactive (default)

“1”: AC’97

Active

February 3, 1999

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Contents Preliminary FeaturesOverview Sensaura LogosGM system level February 3PIN Configuration YMF744B-V 0.5mm pin pitchYMF744B-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 Power Supply 22-pin Reserve Pin 13-pinBlock Diagram PC/PCI IRQMaster Device Mode PCI Bus CommandTarget Device Mode Function OverviewPCI Configuration Register 5C-5Fh00-01h Vendor ID 04-05h Command02-03h Device ID 06-07h Status 0Ah Sub-class Code 08h Revision ID09h Programming Interface 0Bh Base Class Code0Eh Header Type 0Dh Latency Timer10-13h PCI Audio Memory Base Address 18-1Bh Legacy Audio I/O Base Address Dummy for Joystick B0................IO Read OnlyB150 ........Subsystem Vendor ID 2C-2Dh Subsystem Vendor ID2E-2Fh Subsystem ID B150 ........Subsystem ID3Dh Interrupt Pin 34h Capability Register Pointer3Ch Interrupt Line 3Eh Minimum Grant3Fh Maximum Latency 40-41h Legacy Audio ControlB76 ..........SDMA Sound Blaster DMA-8 Channel Select B4................MIEN MPU401 IRQ EnableB5................I/O I/O Address Aliasing Control B108 ........SBIRQ Sound Blaster IRQ Channel Select42-43h Extended Legacy Audio Control B14..............SIEN Serialized IRQ enableB1211 ......SMOD SB DMA mode B8................MAIM MPU401 Acknowledge Interrupt Mask44-45h Subsystem Vendor ID Write Register 46-47h Subsystem ID Write RegisterWrst AC’97 Warm Reset Read / Write Default 0001h Access Bus Width 8, 16, 32-bitCrst AC’97 Software Reset Signal Control 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 50h Capability ID B70 ..........Capability ID Capability Identifier54-55h Power Management Control / Status 52-53h Power Management Capabilities51h Next Item Pointer 58-59h Acpi Mode 5A-5Bh DS-1S Secondary AC’97 Power Control60-61h FM Synthesizer Base Address 62-63h Sound Blaster Base AddressB151 ........MPU401 Base Address 64-65h MPU401 Base Address66-67h Joystick 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 DSP Command CMDSound Blaster Pro Mixer SB Mixer DSPVolume for Midi SB Mixer AC’97SM Scan Mode B0................SBPDR Sound Blaster Power Down RequestSE Scan Enable Sbpda Sound Blaster Power Down AcknowledgementF3h Current FM Synthesizer Array F1h Scan In/ Out DataF2h Current FM Synthesizer Index F4h FM Synthesizer / MPU401 StatusFfemp FM Synthesizer Empty Joystick F8h Interrupt Flag RegisterMPU401 SB IRQ StatusDMA Emulation Protocol PC/PCIDMA Interrupt Routing Serialized IRQHardware Volume Control Digital Audio Interface SpdifZoomed Video Port Sclk Data LrckAC’97 Digital Docking Multiple AC’97 & Multi-ChannelChannel Speaker System Absolute Maximum Ratings Electrical CharacteristicsRecommended Operating Conditions DC Characteristics Reset AC CharacteristicsMaster Clock 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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