Intel 815 manual DOV0STA-Display/Overlay 0 Status Register, Bit

Models: 815

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Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

15.2.DOV0STA—Display/Overlay 0 Status Register

Memory Address Offset:

30008h–3000Bh

Default Value:

0000 5000h

Access:

RO

Size:

32 bits

This read-only register indicates the status for the overlay. References to display are either the primary timing generator or the secondary timing generator depending on which is currently being used.

 

31

 

30

 

 

 

 

 

 

 

 

24

 

 

Reg

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

Update

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Status

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23

 

 

 

 

 

 

21

20

 

19

18

15

 

 

 

 

 

 

 

Reserved

 

 

Overlay 0 Current

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

Buffer/Field.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

13

12

11

10

 

 

0

 

 

Not Active

 

 

Reserved

Not Active

Reserved

 

 

 

Display Line Status.

 

 

Pixel

 

 

 

 

 

 

Video

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Scan Line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

 

 

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

31

Register Update Status. All registers latched (Flip Pending = 0).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vblank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

status

bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

overlay registers are updated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

overlay registers are updated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

overlay update register has been written

overlay update register has been written

 

 

vblank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

status

bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

overlay registers are updated

 

 

 

 

 

 

 

overlay update register has been written

 

 

0

= overlay registers have been updated.

 

 

1

= overlay update register has been written, overlay registers have not been updated.

 

30:21

Reserved.

 

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Image 268
Intel 815 manual DOV0STA-Display/Overlay 0 Status Register, Bit