Intel 815 Benutzerhandbuch
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
360
Bit Descriptions
23:18
Reserved.
17
Vertical Blank Enable.
0 = Vertical Blank Status Disabled
1 = Vertical Blank Status Enabled
16
Overlay Registers Upated Enable.
0 = Overlay Registers have been updated during Vertical Blank Status Disabled
1 = Overlay Registers have been updated during Vertical Blank Status Enabled
15
Flat Panel Hot Plug Detect Status. This bit is the state of the TVCLKIN pin of the TV/Flat Panel
interface. This pin signals an interrupt when it is low. When an interrupt is asserted on the pin, this
status bit reads back as a 1. This bit is forced low when the TVCLKIN pin is selected as a Clock Input
reference to the Dot Clock PLL and NOT an Interrupt pin.
interface. This pin signals an interrupt when it is low. When an interrupt is asserted on the pin, this
status bit reads back as a 1. This bit is forced low when the TVCLKIN pin is selected as a Clock Input
reference to the Dot Clock PLL and NOT an Interrupt pin.
0 = Flat Panel Hot Plug Detect asserted
1 = Flat Panel Hot Plug Detect not asserted (forced to 1 when used as CLKIN)
14:11
Reserved.
10
Flat Panel Hot Plug Detect (edge catcher). This bit is the edge detector for bit 15 above. It is set to 1
when it detects a low to high transition.
when it detects a low to high transition.
0 = Flat Panel Hot Plug Detect not asserted; bit 15 has not transitioned from 1 to 0 (forced to 0 when
used as CLKIN)
1 = Flat Panel Hot Plug Detect asserted; bit 15 has transitioned from 1 to 0.
9
Vertical Sync Status.
0 = Vertical Sync not asserted
1 = Vertical Sync asserted
8
Display Line Compare Status.
0 = Display Line Compare Status not asserted
1 = Display Line Compare Status asserted
7:2
Reserved.
1
Vertical Blank Status.
0 = Vertical Blank Status not asserted
1 = Vertical Blank Status asserted
0
Overlay Registers Updated Status.
0 = Overlay Registers have been updated during Vertical Blank Status not asserted
1 = Overlay Registers have been updated during Vertical Blank Status asserted