YMF740C
DS-1L
YAMAHA CORPORATION
September 21, 1998
YMF740C CATALOG
CATALOG No.:LSI-4MF740C20
January 14, 1999
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)
XG logo is a trademark of YAMAHA Corporation.
GENERAL MIDI logo is a trademark of Association of Musical Electronics Industry (AMEI),
and indicates GM system level 1 Compliant.
YMF740C
January 14, 1999
-3-
PIN DESCRIPTION
1. PCI Bus Interface (52-pin)
name
I/O
Type
Size
function
PCICLK
I
P
PCI Clock
RST#
I
P
Reset
AD[31:0]
IO
Ptr
Address / Data
C/BE[3:0]#
IO
Ptr
Command / Byte Enable
PAR
IO
Ptr
Parity
FRAME#
IO
Pstr
Frame
IRDY#
IO
Pstr
Initiator Ready
TRDY#
IO
Pstr
Target Ready
STOP#
IO
Pstr
Stop
IDSEL
I
P
ID Select
DEVSEL#
IO
Pstr
Device Select
REQA#
O
P
PCI Request
GNTA#
I
P
PCI Grant
PCREQ#
O
Ptr
PC/PCI Request
PCGNT#
I
Ptr
PC/PCI Grant
PERR#
IO
Pstr
Parity Error
SERR#
O
Pod
System Error
INTA#
O
Pod
Interrupt signal output for PCI bus
2. Legacy Device Interface (16-pin)
name
I/O
type
size
function
IRQ5
O
Ttr
12mA
Interrupt5 of Legacy Audio
It is directly connected to the interrupt signal of
System I/O chip.
IRQ7
O
Ttr
12mA
Interrupt7 of Legacy Audio
IRQ9
O
Ttr
12mA
Interrupt9 of Legacy Audio
IRQ10
O
Ttr
12mA
Interrupt10 of Legacy Audio
IRQ11
O
Ttr
12mA
Interrupt11 of Legacy Audio.
GP[3:0]
I
A
-
Game Port
GP[7:4]
I
Tup
-
Game Port
GREF
I
A
-
Reference for Game Port
RXD
I
Tup
-
MIDI Data Receive
TXD
O
T
3mA
MIDI Data Transfer
YMF740C
January 14, 1999
-4-
3. AC'97 Interface (6-pin)
name
I/O
Type
Size
function
CRST#
O
T
6mA
Reset signal for AC'97
CMCLK
O
C
-
Master Clock of AC link (24.576MHz) and
CBCLK
I
T
-
AC-link: Bit Clock for AC'97 audio data
CSDO
O
T
6mA
AC-link: AC`97 Serial audio output data
CSDI
I
T
-
AC-link: AC'97 Serial audio input data
CSYNC
O
T
6mA
AC-link: Synchronized signal
4. Miscellaneous (14-pin)
name
I/O
type
size
function
VOLUP#
I
Tup
-
Hardware Volume (Up)
VOLDW#
I
Tup
-
Hardware Volume (Down)
XI24
I
C
-
24.576 MHz Crystal
XO24
O
C
2mA
24.576 MHz Crystal
TEST[7:4,2:0]#
I
Tup
-
Test pins (Do not connect externally)
TEST3#
IO
Tup
3mA
Test pin (Connect to ground)
LOOPF[1:0]
-
-
-
Capacitor of PLL
5. Power Supply (39-pin)
name
I/O
type
size
function
PVDD[5:0]
-
-
-
Power supply for PCI Bus Interface (+5.0)
PVSS[14:0]
-
-
-
Ground for PCI Bus Interface
LVDD
-
-
-
Power supply for PLL Filter (+3.3)
LVSS
-
-
-
Ground for PLL Filter
VDD3[3:0]
-
-
-
Power supply (+3.3V)
VDD5[3:0]
-
-
-
Power supply (+5.0V)
VSS[7:0]
-
-
-
Ground
TYPE
T : TTL
A : Analog
Ptr : Tri-State PCI
Ttr : Tri-State TTL
C : CMOS
Pstr : Sustained Tri-Sate PCI
Tup : Pull up (Max. 300kohm) TTL
P : PCI
Pod : Open Drain PCI
Note) All pins except the above pins are NC (No Connection) pins. Do not connect externally.
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