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YMF744B
February 3, 1999
-28-
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-1S 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 - - - - - - - Version
b[2:0] ..........Version
These bits contain the revision number of the Power Management Interface Specification. They are
hardwired to 001b.
b10..............D2S: D2 Support
This bit indicates that DS-1S support “D2” of the power state. It is hardwired to “1”.
54-55h: Power Management Control / Status
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
- - - - - - - - - - - - - - PS
b[1:0] ..........PS: Power State
These bits determine the power state of DS-1S. DS-1S supports the following power states:
“0”: D0
“1”: D1 (not supported)
“2”: D2
“3”: D3
hot
When the power state is changed from D3
hot
to D0, DS-1S resets the PCI Configuration register 00-3Fh.
DS-1S transits to D0 Uninitialized state.
Though the power state of this register is changed, the power consumption of DS-1S is not changed. To
support low power, Windows driver controls DS-1S Power Control Register.
DS-1S can support the power state of D0, D1, D2 and D3 with ACPI. In this case, set ACPI bit (58-59h:
ACPI Mode Register) to “1” to disable Capabilities of PCI Bus Power Management.