ymf740c ETC-unknow, ymf740c Datasheet - Page 23

• Manufacturer Part Number: ymf740c
• Description: Ds-1l
• Manufacturer: ETC-unknow

YMF740C
54-55h: Power Management Control / Status
58-59h: ACPI Mode
b[1:0] ..........PS: Power State
b0................ACPI: ACPI Mode Select
These bits determine the power state of DS-1L. DS-1L supports the following power states:
When the power state is changed from D3
DS-1L transits to D0 Uninitialized state.
Though the power state of this register is changed, the power consumption of DS-1L is not changed. To
support low power, Windows driver controls DS-1L Power Control Register.
DS-1L 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.
This bit select either PCI Bus Power Management or ACPI Mode for power management of DS-1L.
b15
b15
“0”:
“1”:
“2”:
“3”:
“0”: PCI Bus Power Management is used. CAP bit (06-07h: Status Register) and Capabilities Pointer
“1”: ACPI Mode is used. CAP bit and Capabilities Pointer are hardwired “0”, and disabled.
-
-
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
(34h) are enabled.
b14
b14
-
-
b13
D0
D1
D2
D3
b13
-
-
hot
b12
b12
-
-
(not supported)
(default)
b11
b11
-
-
b10
b10
-
-
hot
b9
b9
-
-
to D0, DS-1L resets the PCI Configuration register 00-3Fh.
-23-
b8
b8
-
-
b7
b7
-
-
b6
b6
-
-
b5
b5
-
-
b4
b4
-
-
b3
b3
-
-
January 14, 1999
b2
b2
-
-
b1
b1
-
PS
ACPI
b0
b0