Product specifications

VT8601A Apollo PLE133
Revision 1.82 October 22, 2001 -134- Functional Descriptions
Technologies, Inc.
Delivering Value
Delivering ValueDelivering Value
Delivering Value
FUNCTIONAL DESCRIPTIONS
Graphics Controller Power Management
The PLE133 Graphics Controller power mangement feature
set complies with AGP and PCI power management
requirements.
Power Management States
Power management states (D0-D3) for both ACPI and PCI
Bus Power Management (PCI PM) refer to the same states
described in the Device Class PM Reference Specification for
Display Devices, which are equivalent to the VESA™ DPMS
power states. System software should access the PLE133’s
configuration registers to perform PCI PM state transitions.
Table 12. PCI Power Management States
PCI PM
State
Desktop
Graphics
Notebook
Graphics
State 0
(D0)
DPMS State 0
Fully On
Proprietary State 0
Fully On
State 1
(D1)
DPMS State 1
Standby
(Hsync Off)
Proprietary State 1
Standby
(VCLK Off)
State 2
(D2)
DPMS State 2
Suspend
(Vsync Off)
Proprietary State 2
Suspend
(MCLK/VCLK Both Off)
State 3
(D3)
DPMS State 3
Off
(H/Vsync Both Off)
Same as State 2
Power Management Clock Control
If the system “South Bridge” sends a request to the PLE133 to
power down the memory controller, the PLE133 first uses
PCKRUN# (the same signal appearing external to the
PLE133) to check to see if the internal graphics controller
needs to access main memory. The graphics controller logic
will detect PCKRUN# high for 2 or 3 PCICLK’s and check if
there are any:
Internal buffers not emptied
PCIMasterorAGPMasteractionspending
If either condition exists, the graphics controller logic will
assert PCKRUN# low for 2 PCICLK’s to signal the clock
generator to keep PCICLK running.
PME# is not implemented since there are no wake-up
conditions.
Power Management Registers
Power management control for the PLE133 Graphics
Controller is provided by extended registers SR24 (Power
Management Control), GR20 (Standby Timer Control), GR21
(Power Management Control 1), GR22 (Power Management
Control 2), GR23 (Power Status), GR24 (Soft Power Control),
GR25 (Power Control Select), GR26 (DPMS Control), GR27-
28 (GPIO Control), GR2A (Suspend Pin Timer), GR2C
(Miscellaneous Pin Control), GR2F (Miscellaneous Internal
Control), and Graphics Controller PCI Configuration Indices
90-97 (PCI Power Management Registers 1 and 2).