YMF740C
DS-1L
OVERVIEW
YMF740C (DS-1L) is a high performance audio controller for the PCI Bus. DS-1L 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 41 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 32-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-1L supports PC/PCI protocols.
DS-1L supports the connection to AC’97 which provides high quality DAC, ADC and analog mixing.
FEATURES
• PCI 2.1 Compliant
• PC’97/PC’98 specification Compliant
• PCI Bus Power Management rev. 1.0 Compliant
(Support D0, D2 and D3 state)
• PCI Bus Master for PCI Audio
True Full Duplex Playback and Capture with
different Sampling Rate
Maximum 32-voice XG capital Wavetable
Synthesizer including GM compatibility
DirectSound Hardware Acceleration
DirectMusic Hardware Acceleration
Downloadable Sound (DLS) level-1
• Supports PC/PCI DMA for legacy DMAC (8237)
emulation
• Legacy Audio compatibility
FM Synthesizer
Hardware Sound Blaster Pro compatibility
MPU401 UART mode MIDI interface
Joystick
• Supports AC’97 Interface (AC-Link)
• Hardware Volume Control
• Single Crystal operation (24.576MHz)
• 5V Power supply for I/O. 3.3V Power supply for
Internal core logic
• 144-pin LQFP (YMF740C-V)
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.
YAMAHA CORPORATION
YMF740C CATALOG
CATALOG No.:LSI-4MF740C20
September
1999
1998
January 14,
21,
YMF740C
PIN DESCRIPTION
1. PCI Bus Interface (52-pin)
name
PCICLK
RST#
AD[31:0]
C/BE[3:0]#
PAR
FRAME#
IRDY#
TRDY#
STOP#
IDSEL
DEVSEL#
REQA#
GNTA#
PCREQ#
PCGNT#
PERR#
SERR#
INTA#
I/O
I
I
IO
IO
IO
IO
IO
IO
IO
I
IO
O
I
O
I
IO
O
O
Type
P
P
Ptr
Ptr
Ptr
Pstr
Pstr
Pstr
Pstr
P
Pstr
P
P
Ptr
Ptr
Pstr
Pod
Pod
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
function
2. Legacy Device Interface (16-pin)
name
IRQ5
I/O
O
type
Ttr
size
12mA
function
Interrupt5 of Legacy Audio
It is directly connected to the interrupt signal of
System I/O chip.
IRQ7
IRQ9
IRQ10
IRQ11
GP[3:0]
GP[7:4]
GREF
RXD
TXD
O
O
O
O
I
I
I
I
O
Ttr
Ttr
Ttr
Ttr
A
Tup
A
Tup
T
12mA
12mA
12mA
12mA
-
-
-
-
3mA
Interrupt7 of Legacy Audio
Interrupt9 of Legacy Audio
Interrupt10 of Legacy Audio
Interrupt11 of Legacy Audio.
Game Port
Game Port
Reference for Game Port
MIDI Data Receive
MIDI Data Transfer
January 14, 1999
-3-
YMF740C
3. AC’97 Interface (6-pin)
name
CRST#
CMCLK
CBCLK
CSDO
CSDI
CSYNC
I/O
O
O
I
O
I
O
Type
T
C
T
T
T
T
Size
6mA
-
-
6mA
-
6mA
function
Reset signal for AC’97
Master Clock of AC link (24.576MHz) and
AC-link: Bit Clock for AC’97 audio data
AC-link: AC‘97 Serial audio output data
AC-link: AC’97 Serial audio input data
AC-link: Synchronized signal
4. Miscellaneous (14-pin)
name
VOLUP#
VOLDW#
XI24
XO24
TEST[7:4,2:0]#
TEST3#
LOOPF[1:0]
I/O
I
I
I
O
I
IO
-
type
Tup
Tup
C
C
Tup
Tup
-
size
-
-
-
2mA
-
3mA
-
function
Hardware Volume (Up)
Hardware Volume (Down)
24.576 MHz Crystal
24.576 MHz Crystal
Test pins (Do not connect externally)
Test pin (Connect to ground)
Capacitor of PLL
5. Power Supply (39-pin)
name
PVDD[5:0]
PVSS[14:0]
LVDD
LVSS
VDD3[3:0]
VDD5[3:0]
VSS[7:0]
I/O
-
-
-
-
-
-
-
type
-
-
-
-
-
-
-
size
-
-
-
-
-
-
-
function
Power supply for PCI Bus Interface (+5.0)
Ground for PCI Bus Interface
Power supply for PLL Filter (+3.3)
Ground for PLL Filter
Power supply (+3.3V)
Power supply (+5.0V)
Ground
TYPE
T : TTL
Ttr : Tri-State TTL
Tup : Pull up (Max. 300kohm) TTL
A : Analog
C : CMOS
P : PCI
Ptr : Tri-State PCI
Pstr : Sustained Tri-Sate PCI
Pod : Open Drain PCI
Note) All pins except the above pins are NC (No Connection) pins.
Do not connect externally.
January 14, 1999
-4-
京公网安备 11010802033920号
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