YMF744B

0Dh: Latency Timer

Read / Write

Default: 00h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Latency Timer

b[7:0] ..........Latency Timer

When DS-1S becomes a Bus Master device, this register indicates the initial value of the Master Latency

Timer.

0Eh: Header Type

Read Only

Default: 00h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Header Type

b[7:0] ..........Header Type

This register indicates the device type of DS-1S. This is hardwired to 00h.

10-13h: PCI Audio Memory Base Address

Read / Write

Default: 00000000h

Access Bus Width: 8, 16, 32-bit

 

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MBA

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

 

b31

b30

b29

b28

b27

b26

b25

b24

b23

b22

b21

b20

b19

b18

b17

b16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MBA (higher)

 

 

 

 

 

 

 

b[31:15] ......MBA: Memory Base Address

 

 

 

 

 

 

 

 

 

This register indicates the physical Memory Base address of the PCI Audio registers in DS-1S. The base address can be located anywhere in the 32-bit address space. Data in the DS-1S register is not prefetchable.

Size of the register to be mapped into the memory space is 32,768 bytes.

February 3, 1999

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Yamaha YMF744B (DS-1S) specifications 0Dh Latency Timer, 0Eh Header Type, 10-13h PCI Audio Memory Base Address

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.