Yamaha YMF724F 2C-2Dh Subsystem Vendor ID, 2E-2Fh Subsystem ID, 34h Capability Register Pointer

YMF724F

2C-2Dh: Subsystem Vendor ID

Read Only

Default: 1073h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

Subsystem Vendor ID

b[15:0] ........Subsystem Vendor ID

This register contains the Subsystem Vendor ID. In general, this ID is used to distinguish adapters or systems made by different IHVs using the same chip by the same vendor. This register is read only. To write the IHV’s Vendor ID, use 44-45h (Subsystem Vendor ID Write Register). IHVs must change this ID to their Vendor ID in the BIOS POST routine.

In case of the system such as Sound Card which BIOS can not control, this ID can be changed by connecting EEPROM externally. Then, Subsystem Vendor ID Write Register is invalid.

In case EEPROM is not externally, the default value is the YAMAHA's Vendor ID,1073h.

2E-2Fh: Subsystem ID

Read Only

Default: 000Dh

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

Subsystem ID

b[15:0] ........Subsystem ID

This register contains the Subsystem ID. In general, this ID is used to distinguish adapters or systems made by different IHVs using the same chip by the same vendor. This register is read only. To write the IHV's Device ID, use 46-47h (Subsystem ID Write Register). IHVs must change this ID to their ID in the BIOS POST routine.

In case of the system such as Sound Card which BIOS can not control, this ID can be changed by connecting EEPROM externally. Then, Subsystem ID Write Register is invalid.

In case EEPROM is not externally, the default value is the YAMAHA's Device ID, 000Dh.

34h: Capability Register Pointer

Read Only

Default: 50h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Capability Register Pointer

b[7:0] ..........Capability Register Pointer

This register indicates the offset address of the Capabilities register in the PCI Configuration register when 58-59h: ACPI Mode register, ACPI bit is “0”. DS-1 provides PCI Bus Power Management registers as the capabilities. The Power Management registers are mapped to 50h - 57h in the PCI Configuration register, and this register indicates “50h”.

When ACPI bit is “1”, this register indicates “00h”.

September 21, 1998

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