Yamaha YMF744B (DS-1S) 42-43h Extended Legacy Audio Control, B1211 ......SMOD SB DMA mode

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YMF744B

b14..............SIEN: Serialized IRQ enable

DS-1S supports 3 types of interrupt protocols: PCI interrupt (INTA#), Legacy interrupt (IRQs) and Serialized IRQ. The interrupt protocol is selected with IMOD and SIEN as follows.

The interrupt channels for IRQs and Serialized IRQ are determined by SBIRQ and MPUIRQ,. Only one

protocol can be used at once.
SIEN	IMOD	Interrupt protocol
0	0	Legacy interrupt (IRQs)	(default)

01 PCI interrupt (INTA#)

1* Serialized IRQ

b15..............LAD: Legacy Audio Disable
This bit disables the Legacy Audio block.
“0”: Enables the Legacy Audio block
“1”: Disables the Legacy Audio block	(default)

When this bit is set to “1”, DS-1S does not respond to the I/O Target transaction for legacy I/O address on the PCI bus.

42-43h: Extended Legacy Audio Control

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

IMOD

SBVER

SMOD

-

-

MAIM

-

-

-

-

-

-

-

-

b8................MAIM: MPU401 Acknowledge Interrupt Mask

This bit determine whether interrupt is asserted when the acknowledge, which is occurred by changing MPU401 mode form default to UART, is returned.

“0”: Interrupt is asserted when the acknowledge is returned. (default)

“1”: Interrupt is masked when the acknowledge is returned.

b[12:11] ......SMOD: SB DMA mode

These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.

“0”:	PC/PCI	(default)
“1”:	reserved
“2”:	Distributed DMA
“3”	reserved

February 3, 1999

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Contents Overview FeaturesPreliminary Logos GM system levelSensaura February 3PIN Configuration YMF744B-V 0.5mm pin pitchYMF744B-R 0.4mm pin pitch AC’97 Interface 8-pin PIN DescriptionPCI Bus Interface 54-pin Miscellaneous 11-pin External Audio Interface 5-pinLegacy Device Interface 15-pin Power Supply 22-pin Reserve Pin 13-pinBlock Diagram PC/PCI IRQPCI Bus Command Target Device ModeMaster Device Mode Function OverviewPCI Configuration Register 5C-5Fh02-03h Device ID 04-05h Command00-01h Vendor ID 06-07h Status 08h Revision ID 09h Programming Interface0Ah Sub-class Code 0Bh Base Class Code10-13h PCI Audio Memory Base Address 0Dh Latency Timer0Eh Header Type 18-1Bh Legacy Audio I/O Base Address Dummy for Joystick B0................IO Read Only2C-2Dh Subsystem Vendor ID 2E-2Fh Subsystem IDB150 ........Subsystem Vendor ID B150 ........Subsystem ID 34h Capability Register Pointer 3Ch Interrupt Line 3Dh Interrupt Pin 3Eh Minimum Grant3Fh Maximum Latency 40-41h Legacy Audio ControlB4................MIEN MPU401 IRQ Enable B5................I/O I/O Address Aliasing ControlB76 ..........SDMA Sound Blaster DMA-8 Channel Select B108 ........SBIRQ Sound Blaster IRQ Channel SelectB14..............SIEN Serialized IRQ enable B1211 ......SMOD SB DMA mode42-43h Extended Legacy Audio Control B8................MAIM MPU401 Acknowledge Interrupt Mask44-45h Subsystem Vendor ID Write Register 46-47h Subsystem ID Write RegisterRead / Write Default 0001h Access Bus Width 8, 16, 32-bit Crst AC’97 Software Reset Signal ControlWrst AC’97 Warm Reset 48-49h DS-1S Control4A-4Bh DS-1S Power Control 4C-4Dh D-DMA Slave Configuration 4E-4Fh DS-1S Power Control B12 Psacl Power Save AC-LinkPsio Power Save I/O Pad 50h Capability ID B70 ..........Capability ID Capability Identifier51h Next Item Pointer 52-53h Power Management Capabilities54-55h Power Management Control / Status 58-59h Acpi Mode 5A-5Bh DS-1S Secondary AC’97 Power Control60-61h FM Synthesizer Base Address 62-63h Sound Blaster Base Address64-65h MPU401 Base Address 66-67h Joystick Base AddressB151 ........MPU401 Base Address B150 ........Joystick Base AddressISA Compatible Device DS-1S FM Synthesizer Status Register RO FM Synthesizer BlockStatus Register FM Synthesizer Data Register Array 1 R/W FM Synthesizer Data RegisterFM Synthesizer Data Register Array 0 R/W Sound Blaster Pro Block DSP Command CMDSound Blaster Pro Mixer SB Mixer DSPVolume for Midi SB Mixer AC’97B0................SBPDR Sound Blaster Power Down Request SE Scan EnableSM Scan Mode Sbpda Sound Blaster Power Down AcknowledgementF1h Scan In/ Out Data F2h Current FM Synthesizer IndexF3h Current FM Synthesizer Array F4h FM Synthesizer / MPU401 StatusFfemp FM Synthesizer Empty F8h Interrupt Flag Register MPU401Joystick SB IRQ StatusDMA Emulation Protocol PC/PCIDMA Interrupt Routing Serialized IRQHardware Volume Control Digital Audio Interface SpdifZoomed Video Port Sclk Data LrckChannel Speaker System Multiple AC’97 & Multi-ChannelAC’97 Digital Docking Recommended Operating Conditions Electrical CharacteristicsAbsolute Maximum Ratings DC Characteristics Master Clock AC CharacteristicsReset 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