Yamaha YMF744B (DS-1S) specifications AC’97 Master Clock, Master Clock timing for AC’97

Page 55

YMF744B

4-4. AC’97 Master Clock

(Fig.5)

 

 

 

 

 

 

 

 

 

 

 

Item

 

Symbol

Min.

Typ.

Max.

Unit

 

 

 

 

 

 

 

CMCLK Cycle Time

 

tCMCYC

-

40.69

-

ns

CMCLK High Time

 

tCMHIGH

8

-

-

ns

CMCLK Low Time

 

tCMLOW

8

 

-

ns

CMCLK Rising Time

 

tCMR

-

4.6

-

ns

CMCLK Falling Time

 

tCMF

-

2.1

-

ns

Note : Top = 0-70°C, PVDD=3.3 ±0.3 V, VDD=3.3±0.3 V, CVDD=3.3±0.3 V, LVDD=3.3±0.3 V, CL=50 pF

t CMR

t CMF

 

0.8 VDD3

CMCLK

0.5 VDD3

 

 

0.2 VDD3

 

 

t CMHIGH t CMLOW

t CMCYC

Fig.5: Master Clock timing for AC’97

February 3, 1999

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Contents Preliminary FeaturesOverview February 3 LogosGM system level SensauraYMF744B-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 DiagramFunction Overview PCI Bus CommandTarget Device Mode Master Device Mode5C-5Fh PCI Configuration Register00-01h Vendor ID 04-05h Command02-03h Device ID 06-07h Status 0Bh Base Class Code 08h Revision ID09h Programming Interface 0Ah Sub-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 JoystickB150 ........Subsystem ID 2C-2Dh Subsystem Vendor ID2E-2Fh Subsystem ID B150 ........Subsystem Vendor ID3Eh Minimum Grant 34h Capability Register Pointer3Ch Interrupt Line 3Dh Interrupt Pin40-41h Legacy Audio Control 3Fh Maximum LatencyB108 ........SBIRQ Sound Blaster IRQ Channel Select B4................MIEN MPU401 IRQ EnableB5................I/O I/O Address Aliasing Control B76 ..........SDMA Sound Blaster DMA-8 Channel SelectB8................MAIM MPU401 Acknowledge Interrupt Mask B14..............SIEN Serialized IRQ enableB1211 ......SMOD SB DMA mode 42-43h Extended Legacy Audio Control46-47h Subsystem ID Write Register 44-45h Subsystem Vendor ID Write Register48-49h DS-1S Control Read / Write Default 0001h Access Bus Width 8, 16, 32-bitCrst AC’97 Software Reset Signal Control Wrst AC’97 Warm Reset4A-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 AddressB150 ........Joystick Base Address 64-65h MPU401 Base Address66-67h Joystick Base Address B151 ........MPU401 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 MidiSbpda Sound Blaster Power Down Acknowledgement B0................SBPDR Sound Blaster Power Down RequestSE Scan Enable SM Scan ModeF4h FM Synthesizer / MPU401 Status F1h Scan In/ Out DataF2h Current FM Synthesizer Index F3h Current FM Synthesizer ArrayFfemp FM Synthesizer Empty SB IRQ Status F8h Interrupt Flag RegisterMPU401 JoystickPC/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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