YMF744B ETC [List of Unclassifed Manufacturers], YMF744B Datasheet - Page 28

• Manufacturer Part Number: YMF744B
• Description: DS-1S
• Manufacturer: ETC [List of Unclassifed Manufacturers]

YMF744B
51h: Next Item Pointer
52-53h: Power Management Capabilities
54-55h: Power Management Control / Status
b[7:0] ..........Next Item Pointer
b[2:0] ..........Version
b10..............D2S: D2 Support
b[1:0] ..........PS: Power State
DS-1S does not provide other new capability besides Power Management. This register is hardwired to
00h.
These bits contain the revision number of the Power Management Interface Specification. They are
hardwired to 001b.
This bit indicates that DS-1S support “D2” of the power state. It is hardwired to “1”.
These bits determine the power state of DS-1S. DS-1S supports the following power states:
When the power state is changed from D3
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.
b15
b15
b7
“0”:
“1”:
“2”:
“3”:
-
-
Read Only
Default: 00h
Access Bus Width: 8, 16, 32-bit
Read Only
Default: 0401h
Access Bus Width: 8, 16, 32-bit
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
b14
b14
b6
-
-
b13
b13
D0
D1
D2
D3
b5
-
-
hot
Next Item Pointer
b12
b12
b4
-
-
(not supported)
b11
b11
b3
-
-
D2S
b10
b10
b2
-
b1
b9
b9
hot
-
-
to D0, DS-1S resets the PCI Configuration register 00-3Fh.
-28-
b0
b8
b8
-
-
b7
b7
-
-
b6
b6
-
-
b5
b5
-
-
b4
b4
-
-
b3
b3
-
-
February 3, 1999
b2
b2
-
Version
b1
b1
PS
b0
b0