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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Yamaha YMF744B (DS-1S) specifications 48-49h DS-1S Control, Read / Write Default 0001h Access Bus Width 8, 16, 32-bit

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.