Yamaha YMF724F specifications 51h Next Item Pointer, 52-53h Power Management Capabilities

YMF724F

51h: Next Item Pointer

Read Only

Default: 00h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Next Item Pointer

b[7:0] ..........Next Item Pointer

DS-1 does not provide other new capability besides Power Management. This register is hardwired to

00h.

52-53h: Power Management Capabilities

Read Only

Default: 0401h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

-

-

-

-

-

D2S

D1S

-

-

-

-

-

-

Version

b[2:0]

Version

These bits contain the revision number of the Power Management Interface Specification. They are hardwired to 001b.

b9 D1S: D1 Support

This bit indicates whether DS-1 support “D1” of the power state. Only when EEPROM connects externally, this bit can be set to “1”, and D1 state can support. When EEPROM does not connect externally, use ACPI mode (58-59h: ACPI Mode Register, ACPI bit) to support D1 state.

The default value is “0”.

b10 D2S: D2 Support

This bit indicates that DS-1 support “D2” of the power state. It is hardwired to “1”.

September 21, 1998

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