YMF744B
DS-1S
OVERVIEW
YMF744B (DS-1S) is a high performance audio controller for the PCI Bus. DS-1S consists of two separated
functional blocks. One is the PCI Audio block and the other is the Legacy Audio block. PCI Audio block
allows Software Driver to handle maximum of 73 concurrent audio streams with the Bus Master DMA engine.
The PCI Audio Engine converts the sampling rate of each audio stream and the streams are mixed without
utilizing the CPU or causing system latency. By using the Software Driver from YAMAHA, PCI Audio
provides 64-voice XG wavetable synthesizer with Reverb and variation. It also supports DirectSound hardware
accelerator, Downloadable Sound (DLS) and DirectMusic accelerator.
Legacy Audio block supports FM Synthesizer, Sound Blaster Pro, MPU401 UART mode and Joystick
function in order to provide hardware compatibility for numerous PC games on real DOS without any software
driver. To achieve legacy DMAC compatibility on the PCI, DS-1S supports both PC/PCI and Distributed
DMA protocols. DS-1S also supports Serialized IRQ for legacy IRQ compatibility.
DS-1S supports the connection to AC’97 which provides high quality DAC, ADC and analog mixing, and it
can connect two AC’97s. In addition, it supports consumer IEC958, Audio Digital Interface (SPDIF), to
connect external audio equipment by digital.
Preliminary
FEATURES
• PCI 2.2 Compliant
• PC’98/PC’99 specification Compliant
• PCI Bus Power Management rev. 1.0 Compliant
(Support D0, D2 and D3 state)
• Supports clock run
• PCI Bus Master for PCI Audio
True Full Duplex Playback and Capture with
different Sampling Rate
Maximum 64-voice XG capital Wavetable
Synthesizer including GM compatibility
DirectSound Hardware Acceleration
DirectMusic Hardware Acceleration
Downloadable Sound (DLS) level-1
• Legacy Audio compatibility
FM Synthesizer
Hardware Sound Blaster Pro compatibility
MPU401 UART mode MIDI interface
Joystick
• Supports Serialized IRQ
• Supports PC/PCI and Distributed DMA for legacy
DMAC (8237) emulation
• Supports I
2
S serial input for Zoomed Video Port
• Supports Consumer IEC958 Output (SPDIF OUT)
• Supports Consumer IEC958 Input (SPDIF IN)
• Supports AC’97 Interface (AC-Link) Revision 2.1
• AC’97 Digital Docking
• Supports 4-Channel Speaker
• Hardware Volume Control
• EEPROM Interface
• Single Crystal operation (24.576MHz)
• 3.3V Power supply (5V tolerant)
• 128-pin LQFP YMF744B-V : 0.5mm pin pitch
YMF744B-R : 0.4mm pin pitch
The contents of this catalog are target specifications and are subject to change
without prior notice. When using this device, please recheck the specifications.
YAMAHA CORPORATION
YMF744B CATALOG
December 18, 1998
CATALOG No.:LSI-4MF744B00
February 3, 1999
YMF744B
LOGOS
GENERAL MIDI logo is a trademark of Association of Musical Electronics Industry (AMEI),
and indicates GM system level 1 Compliant.
XG logo is a trademark of YAMAHA Corporation.
SONDIUS-XG logo is a trademark that Stanford University in the United States and
YAMAHA Corporation hold jointly.
Sensaura logo is a trademark of Central Research Laboratories Limited.
1. GM system level 1
GM system level 1 is a world standard format about MIDI synthesizer which provides voice arrangements
and MIDI functions.
2. XG
XG is a format about MIDI synthesizer that is proposed by YAMAHA, and keeps the upper compatibility of
GM system level 1.
3. SONDIUS-XG
Products bearing the SONDIUS-XG logo are licensed under patents of Stanford University and YAMAHA
Corporation as listed on <http://www.sondius-xg.com>.
The SONDIUS-XG produces acoustic sound
Therefore, it provides
outputs by running a virtual simulation of the actual acoustic instrument operation.
that simply processes the recorded acoustic sound sources only.
of virtual acoustic sound to the XG format.
4. Sensaura
Sensaura is a technology which provides 3D positional audio and moving effect by HRTF (Head Related
Transfer Function) with 2 speakers or headphone.
This feature makes it possible to enjoy invariable and
unchangeable sound feelings in all-positional area covering as wide as 360 degrees.
The good points are the voice arrangements kept extensively, a large number of the
voices, modification of the voices, 3 kinds of effects, and so on.
much more real-world acoustic sound outputs fundamentally different from the Wavetable sound generator
The SONDIUS-XG adds the technology
February 3, 1999
-2-
YMF744B
PIN DESCRIPTION
1. PCI Bus Interface (54-pin)
Name
PCICLK
RST#
AD[31:0]
C/BE[3:0]#
PAR
FRAME#
IRDY#
TRDY#
STOP#
IDSEL
DEVSEL#
REQ#
GNT#
PCREQ#
PCGNT#
PERR#
SERR#
INTA#
SERIRQ#
CLKRUN#
I/O
I
I
IO
IO
IO
IO
IO
IO
IO
I
IO
O
I
O
I
IO
O
O
IO
IO
Type
P
P
Ptr
Ptr
Ptr
Pstr
Pstr
Pstr
Pstr
P
Pstr
Ptr
P
Ptr
P
Pstr
Pod
Pod
Ptr
Ptr
Size
PCI Clock
Reset
Address / Data
Command / Byte Enable
Parity
Frame
Initiator Ready
Target Ready
Stop
ID Select
Device Select
PCI Request
PCI Grant
PC/PCI Request
PC/PCI Grant
Parity Error
System Error
Interrupt signal output for PCI bus
Serialized IRQ
Clock Run
Function
2. AC’97 Interface (8-pin)
Name
CRST#
CMCLK
CBCLK
CSDO
CSYNC
CSDI0
CSDI2
DOCKEN#
I/O
O
O
I
O
O
I
I
I
Type
T
C
T
T
T
T
Tup
Tup
Size
6mA
6mA
-
6mA
6mA
-
-
-
Function
Reset signal for AC’97
Master Clock for AC’97 (24.576MHz)
AC-link: Bit Clock for AC’97 audio data
AC-link: AC’97 Serial audio output data
AC-link: AC’97 Synchronized signal
AC-link: AC’97 Serial audio input data (Primary)
AC-link: AC’97 Serial audio input data (Secondary)
Docking Enable
February 3, 1999
-5-
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