Yamaha YMF724F specifications ISA Compatible Device, OPL3

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YMF724F

2. ISA Compatible Device

DS-1 contains the following functions to maintain the compatibility with the past ISA Sound Devices. These devices are considered Legacy devices and the functions are referred to as Legacy Audio.

Legacy Audio is independent from PCI Audio and can be used simultaneously.

The configuration is set in the Legacy Audio Control Register in the PCI Configuration Register space. Basically, these registers are configured by the BIOS.

Also, logical device IDs are assigned to the devices to support Plug and Play. Yamaha defines the following logical IDs.

To control the device with the BIOS, the logical device IDs must be defined in the PnP BIOS extended ROM space. The logical IDs are determined by how it is configured. IDs and configuration are as follows.

	Logical Device ID			Functions used (Block)
	Logical Device ID		OPL3(*)	MPU401	SB Pro (*)	Joystick
			OPL3(*)	MPU401	SB Pro (*)	Joystick
		YMH0100	O	O	O
		YMH0101				O
* The blocks pertain to the following.
OPL3:		Points to the FM synthesizer mapped to AdLibBase (0x0388).
SB Pro:		Points to the Voice Playback section only.

These devices are independent from each other, and can be Enabled/Disabled individually. However, both AdLib and Sound Blaster must be disabled to disable the internal OPL3. Disabling just AdLib only masks the access.

The driver by Yamaha supports only logical device ID, YMH0100. For YMH0101, use the driver provided by Microsoft.

September 21, 1998

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Contents Overview FeaturesLogos GM system levelSensaura YMF724F-V PIN ConfigurationPIN Description PCI Bus Interface 53-pinYMF730AC-2 Interface 6-pin YMF727AC3F2 Interface 9-pin Spdif Interface 1-pinLegacy Device Interface 16-pin Miscellaneous 15-pin Power Supply 39-pinOPL3 Block DiagramDOS VM System DiagramFunction Overview PCI Bus CommandPCI Configuration Register 04 05h Command 00 01h Vendor ID02 03h Device ID 06 07h Status 0Bh Base Class Code 08h Revision ID09h Programming Interface 0Ah Sub-class Code0Dh Latency Timer 0Eh Header Type10 13h PCI Audio Memory Base Address 2C-2Dh Subsystem Vendor ID 2E-2Fh Subsystem ID34h Capability Register Pointer 3Fh Maximum Latency 3Ch Interrupt Line3Dh Interrupt Pin 3Eh Minimum Grant40 41h Legacy Audio Control B76 ..........SDMA Sound Blaster DMA-8 Channel Select B108 ........SBIRQ Sound Blaster IRQ Channel SelectB1311 ......MPUIRQ MPU401 IRQ Channel Select 42 43h Extended Legacy Audio Control B1413 ......SBVER SB Version Select B1211 ......SMOD SB DMA modeB15..............IMOD Legacy IRQ mode 44-45h Subsystem Vendor ID Write Register4A-4Bh DS-1 Power Control Register 46-47h Subsystem ID Write Register48-49h DS-1 Control Register PSN Power Save PCI Audio block DPLL1 Disable PLL1 Clock OscillationPSL0 Power Save Legacy Audio Block PSL1 Power Save Legacy Audio BlockB12..............PR4 AC-2 Power down Control B13..............PR5 AC-2 Power down ControlB1514 ......AC-2 Power down Control 6 50h Capability ID 4C-4Dh D-DMA Slave Configuration51h Next Item Pointer 52-53h Power Management CapabilitiesB0................ACPI Acpi Mode Select 54-55h Power Management Control / Status58-59h Acpi Mode B10 ..........PS Power StateOPL3 ISA Compatible DevicePCI OPL3 Status Register RO OPL3 BlockOPL3 Data Register Array 1 R/W OPL3 Data Register Array 0 R/WSound Blaster Pro Block CMD Sound Blaster Pro Mixer SB Mixer AC-2 Sbpda Sound Blaster Power Down Acknowledgement B0................SBPDR Sound Blaster Power Down RequestSE Scan Enable SM Scan ModeB0................SBI SB Interrupt Flag F1h Scan In/ Out DataF8h Interrupt Flag Register B70 ..........SCAN DataJoystick MPU401PC/PCI DMA Emulation ProtocolDMA Interrupt Routing Digital Audio InterfaceSerialized IRQ Hardware Volume Control Absolute Maximum Ratings Electrical CharacteristicsDC Characteristics Master Clock ResetPoint to Point Input Hold Time for Pciclk PCI InterfaceAC-link AC-2 / AC3F2 Master ClockInput Hold Time for Abclk AC3F2 InterfaceAC3F2 Control Interface timing OFF External DimensionsYamaha Corporation