State Diagrams; Intel740™ Graphics Controller (On Board Device) Remains In Low Power Mode; Intel740™ Graphics Controller (On Board Device) State Diagram - Intel 740 Design Manual

3 Device AGP MotherBoard Design
3.1.5

State Diagrams

Figure 3-4. Intel740™ Graphics Controller (On Board Device) Remains in Low Power Mode
At system RESET, the Intel740™ graphics controller on the motherboard is always put into the
low power state. The following are examples in which the on board device shall remain in low
power state:
•
AGP add-in card is present
•
PCI or ISA graphics device is the primary and only graphics device desired
•
Multimonitor configurations not utilizing the on board graphics device.
Note: When not in use, both GPO27 and GPO28 should be driven high (1).
Figure 3-5. Intel740™ Graphics Controller (On Board Device) State Diagram
The Intel740 graphics controller down on the motherboard enters the low power mode at system
reset. If an enabling event occurs, the device enters the functional mode from the low power mode
(See Figure
The following are examples in which functional mode would be invoked:
•
Intel740™ graphics accelerator as the primary and only graphics device
•
Multimonitor configurations utilizing the Intel740™ graphics controller
3-6
3-5).
System
Reset
Low Power
Mode
System
Reset
Low Power
Mode
Functional
Mode
Intel740™ Graphics Accelerator Design Guide