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YMF744B
February 3, 1999
-29-
58-59h: ACPI Mode
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
- - - - - - - - - - - - - - - ACPI
b0................ACPI: ACPI Mode Select
This bit select either PCI Bus Power Management or ACPI Mode for power management of DS-1S.
“0”: PCI Bus Power Management is used. CAP bit (06-07h: Status Register) and Capabilities Pointer
(34h) are enabled. (default)
“1”: ACPI Mode is used. CAP bit and Capabilities Pointer are hardwired “0”, and disabled.
5A-5Bh: DS-1S Secondary AC’97 Power Control
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
- - - - - - - - SPR7 SPR6 SPR5 SPR4 SPR3 SPR2 SPR1 SPR0
b0................SPR0: Secondary AC’97 Power Down Control 0
This bit controls the power state of the ADC and Input Mux in the Secondary AC’97.
“0”: Normal (default)
“1”: Power down
b1................SPR1: Secondary AC’97 Power Down Control 1
This bit controls the power state of the DAC in the Secondary AC’97.
“0”: Normal (default)
“1”: Power down
b2................SPR2: Secondary AC’97 Power Down Control 2
This bit controls the power state of the Analog Mixer (Vref still on) in the Secondary AC’97. This
power state retains the Reference Voltage of the AC’97.
“0”: Normal (default)
“1”: Power down
b3................SPR3: Secondary AC’97 Power Down Control 3
This bit controls the power state of the Analog Mixer (Vref off) in the Secondary AC’97. This power
state removes Reference Voltage of the AC’97.
“0”: Normal (default)
“1”: Power down