User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

337

17.5. VBLANK—Vertical Blank Register

Address Offset: 60010h

Default Value: 00000000h

Access: Read/Write

Size: 32 bits

31 28 27 16

Reserved Vertical Blank End

15 12 11 0

Reserved Vertical Blank Start

Bit Description

31:28 Reserved.

27:16 Vertical Blank End. Vertical blank end expressed in terms of absolute line number relative to the

vertical active display start. Note: Vertical blank will be deasserted when vertical total occurs

irrespective of what is programmed in vertical blank end.

15:12 Reserved.

11:0 Vertical Blank Start. Vertical blank start expressed in terms of absolute line number relative to the

vertical active display start.