Yamaha YMF744B (DS-1S) 60-61h FM Synthesizer Base Address, 62-63h Sound Blaster Base Address

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YMF744B

b4

................SPR4: Secondary AC’97 Power Down Control 4

 

This bit controls the power state of the AC-linkin the Secondary AC’97.

 

“0”: Normal

(default)

 

“1”: Power down

 

b5

................SPR5: Secondary AC’97 Power Down Control 5

 

Setting this bit to “1” disables the internal clock of the Secondary AC’97. In case the AC’97 is used with

 

DS-1S, the master clock is supplied from DS-1S. Therefore, when the clock is stopped completely, set

 

SPR5 bits to “1” firstly, then the CMCD bit should be set to “1” after duration of 20µs or longer.

 

“0”: Normal

(default)

 

“1”: Disable

 

b6

................SPR6: Secondary AC’97 Power Down Control 6

 

This bit controls PR6 bit status of the power control register in the Secondary AC’97.

b7

................SPR7: Secondary AC’97 Power Down Control 7

This bit controls PR7 bit status of the power control register in the Secondary AC’97.

Respective data set to b[7:0] are correspondingly set into the “Power down Control/Status” register in the Secondary AC’97 via the AC-Link. These are not set into the power down register in the Primary AC’97.

60-61h: FM Synthesizer Base Address

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FM Synthesizer Base Address

 

 

 

 

 

-

-

b[15:2] ........FM Synthesizer Base Address

This register sets the base address of the FM synthesizer. If b5:I/O bit of 40h register is set to “1”, b[9:2]

bits are decoded by ignoring b[15:10] bits.

62-63h: Sound Blaster Base Address

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sound Blaster Base Address

 

 

 

 

-

-

-

-

b[15:4] ........Sound Blaster Base Address

This register sets the base address of the Sound Blaster. If b5:I/O bit of 40h register is set to “1”, b[9:4]

bits are decoded by ignoring b[15:10] bits.

February 3, 1999

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Contents Features PreliminaryOverview Sensaura LogosGM system level February 3PIN Configuration YMF744B-V 0.5mm pin pitchYMF744B-R 0.4mm pin pitch PIN Description PCI Bus Interface 54-pinAC’97 Interface 8-pin External Audio Interface 5-pin Legacy Device Interface 15-pinMiscellaneous 11-pin Power Supply 22-pin Reserve Pin 13-pinBlock Diagram PC/PCI IRQMaster Device Mode PCI Bus CommandTarget Device Mode Function OverviewPCI Configuration Register 5C-5Fh04-05h Command 00-01h Vendor ID02-03h Device ID 06-07h Status 0Ah Sub-class Code 08h Revision ID09h Programming Interface 0Bh Base Class Code0Dh Latency Timer 0Eh Header Type10-13h PCI Audio Memory Base Address 18-1Bh Legacy Audio I/O Base Address Dummy for Joystick B0................IO Read OnlyB150 ........Subsystem Vendor ID 2C-2Dh Subsystem Vendor ID2E-2Fh Subsystem ID B150 ........Subsystem ID3Dh Interrupt Pin 34h Capability Register Pointer3Ch Interrupt Line 3Eh Minimum Grant3Fh Maximum Latency 40-41h Legacy Audio ControlB76 ..........SDMA Sound Blaster DMA-8 Channel Select B4................MIEN MPU401 IRQ EnableB5................I/O I/O Address Aliasing Control B108 ........SBIRQ Sound Blaster IRQ Channel Select42-43h Extended Legacy Audio Control B14..............SIEN Serialized IRQ enableB1211 ......SMOD SB DMA mode B8................MAIM MPU401 Acknowledge Interrupt Mask44-45h Subsystem Vendor ID Write Register 46-47h Subsystem ID Write RegisterWrst AC’97 Warm Reset Read / Write Default 0001h Access Bus Width 8, 16, 32-bitCrst AC’97 Software Reset Signal Control 48-49h DS-1S Control4A-4Bh DS-1S Power Control 4C-4Dh D-DMA Slave Configuration 4E-4Fh DS-1S Power Control Psacl Power Save AC-Link Psio Power Save I/O PadB12 50h Capability ID B70 ..........Capability ID Capability Identifier52-53h Power Management Capabilities 54-55h Power Management Control / Status51h Next Item Pointer 58-59h Acpi Mode 5A-5Bh DS-1S Secondary AC’97 Power Control60-61h FM Synthesizer Base Address 62-63h Sound Blaster Base AddressB151 ........MPU401 Base Address 64-65h MPU401 Base Address66-67h Joystick Base Address B150 ........Joystick Base AddressISA Compatible Device DS-1S FM Synthesizer Block Status RegisterFM Synthesizer Status Register RO FM Synthesizer Data Register FM Synthesizer Data Register Array 0 R/WFM Synthesizer Data Register Array 1 R/W Sound Blaster Pro Block DSP Command CMDSound Blaster Pro Mixer SB Mixer DSPVolume for Midi SB Mixer AC’97SM Scan Mode B0................SBPDR Sound Blaster Power Down RequestSE Scan Enable Sbpda Sound Blaster Power Down AcknowledgementF3h Current FM Synthesizer Array F1h Scan In/ Out DataF2h Current FM Synthesizer Index F4h FM Synthesizer / MPU401 StatusFfemp FM Synthesizer Empty Joystick F8h Interrupt Flag RegisterMPU401 SB IRQ StatusDMA Emulation Protocol PC/PCIDMA Interrupt Routing Serialized IRQHardware Volume Control Digital Audio Interface SpdifZoomed Video Port Sclk Data LrckMultiple AC’97 & Multi-Channel AC’97 Digital DockingChannel Speaker System Electrical Characteristics Absolute Maximum RatingsRecommended Operating Conditions DC Characteristics AC Characteristics ResetMaster Clock PCI Interface PCI Clock timingAC’97 Master Clock Master Clock timing for AC’97AC-link AC-link timingZoomed Video Port Zoomed Video Port timingExternal Dimensions Unit mm February 3YMF744B-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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