YMF744B

51h: Next Item Pointer

Read Only

Default: 00h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Next Item Pointer

b[7:0] ..........Next Item Pointer

DS-1S does not provide other new capability besides Power Management. This register is hardwired to

00h.

52-53h: Power Management Capabilities

Read Only

Default: 0401h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

-

-

-

-

D2S

-

-

-

-

-

-

-

 

Version

 

b[2:0] ..........Version

These bits contain the revision number of the Power Management Interface Specification. They are hardwired to 001b.

b10..............D2S: D2 Support

This bit indicates that DS-1S support “D2” of the power state. It is hardwired to “1”.

54-55h: Power Management Control / Status

Read / Write

Default: 0000h

Access Bus Width: 8, 16, 32-bit

 

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

 

b0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

-

-

 

-

-

-

-

-

-

-

-

-

-

-

 

PS

b[1:0] ..........PS: Power State

 

 

 

 

 

 

 

 

 

 

 

 

 

These bits determine the power state of DS-1S. DS-1S supports the following power states:

 

 

 

 

“0”:

 

D0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“1”:

 

D1

 

(not supported)

 

 

 

 

 

 

 

 

 

 

 

 

“2”:

 

D2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“3”:

 

D3

hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When the power state is changed from D3hot to D0, DS-1S resets the PCI Configuration register 00-3Fh. DS-1S transits to D0 Uninitialized state.

Though the power state of this register is changed, the power consumption of DS-1S is not changed. To support low power, Windows driver controls DS-1S Power Control Register.

DS-1S can support the power state of D0, D1, D2 and D3 with ACPI. In this case, set ACPI bit (58-59h: ACPI Mode Register) to “1” to disable Capabilities of PCI Bus Power Management.

February 3, 1999

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Yamaha YMF744B (DS-1S) specifications 51h Next Item Pointer, 52-53h Power Management Capabilities

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.