YMF744B

2-1-2. FM Synthesizer Data Register

FM Synthesizer Data Register Array 0 (R/W):

Address

D7

 

D6

 

D5

D4

D3

 

D2

 

D1

D0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00-01h

 

 

 

 

 

LSI TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02h

 

 

 

 

 

TIMER 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

03h

 

 

 

 

 

TIMER 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04h

RST

 

MT1

 

MT2

-

-

 

-

 

ST2

ST1

 

 

 

 

 

 

 

 

 

 

 

 

 

08h

-

 

NTS

 

-

-

-

 

-

 

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

20-35h(*1)

AM

 

VIB

 

EGT

KSR

 

 

 

MULT

 

40-55h(*2)

 

KSL

 

 

 

 

TL

 

 

 

60-75h(*3)

 

 

 

AR

 

 

 

 

DR

 

80-95h(*4)

 

 

 

SL

 

 

 

 

RR

 

A0-A8h

 

 

 

 

 

F-NUM (L)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B0-B8h

-

 

-

 

KON

 

BLOCK

 

 

 

F-NUM (H)

 

 

 

 

 

 

 

 

 

 

 

 

 

BDh

DAM

 

DVB

 

RHY

BD

SD

 

TOM

 

TC

HH

 

 

 

 

 

 

 

 

 

 

 

 

 

C0-C8h

*6

 

*6

 

CHR

CHL

 

 

FB

 

 

CNT

 

 

 

 

 

 

 

 

 

 

 

 

 

E0-F5h(*5)

-

 

-

 

-

-

-

 

 

 

WS

 

FM Synthesizer Data Register Array 1 (R/W)

Address

D7

 

D6

 

D5

D4

D3

 

D2

 

D1

D0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00-01h

 

 

 

 

 

LSI TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04h

-

 

-

 

 

 

CONNECTION SEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

05h

-

 

-

 

-

-

-

 

*

 

*

NEW

 

 

 

 

 

 

 

 

 

 

 

 

 

20-35h(*1)

AM

 

VIB

 

EGT

KSR

 

 

MULT

 

 

40-55h(*2)

 

KSL

 

 

 

 

TL

 

 

60-75h(*3)

 

 

 

AR

 

 

 

DR

 

 

80-95h(*4)

 

 

 

SL

 

 

 

RR

 

 

A0-A8h

 

 

 

 

 

F-NUM (L)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B0-B8h

-

 

-

 

KON

 

BLOCK

 

 

 

F-NUM (H)

 

 

 

 

 

 

 

 

 

 

 

 

 

C0-C8h

*6

 

*6

 

CHR

CHL

 

 

FB

 

CNT

 

 

 

 

 

 

 

 

 

 

 

 

 

E0-F5h(*5)

-

 

-

 

-

-

-

 

 

 

WS

 

*1 : 26h, 27h, 2Eh and 2Fh do not exist.

*2 : 46h, 47h, 4Eh and 4Fh do not exist.

*3 : 66h, 67h, 6Eh and 6Fh do not exist.

*4 : 86h, 87h, 8Eh and 8Fh do not exist.

*5 : E6h, E7h, EEh and EFh do not exist.

*6 : The bits exist, but do not function.

February 3, 1999

-35-

Page 35
Image 35
Yamaha YMF744B (DS-1S) FM Synthesizer Data Register Array 0 R/W, FM Synthesizer Data Register Array 1 R/W

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.