Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

17.3.HSYNC—Horizontal Sync Register

Address Offset:

 

60008h

 

Default Value:

 

00000000h

 

Access:

 

 

Read/Write

 

Size:

 

 

32 bits

 

31

28

27

16

 

 

 

 

Reserved

 

Horizontal Sync End

 

 

 

 

 

 

 

 

15

12

11

0

 

 

 

 

Reserved

 

Horizontal Sync Start

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

Description

 

 

 

 

 

 

 

 

31:28

Reserved.

 

 

 

 

 

 

 

 

27:16

Horizontal Sync End. Horizontal sync end expressed in terms of absolute pixel number relative to the

 

 

 

 

horizontal active display start.

 

 

 

 

 

Notes:

 

 

 

 

 

 

1. Minimum HSYNC width is 1 pixel clock.

 

 

 

 

1. An asserted HSYNC will be cleared as soon as HTOTAL end is reached, regardless of the value in

 

 

 

 

the HSYNC End register.

 

 

 

 

 

 

 

 

 

15:12

Reserved.

 

 

 

 

 

 

 

 

11:0

Horizontal Sync Start. Horizontal sync start expressed in terms of absolute pixel number relative to

 

 

 

 

the horizontal active display start.

 

 

 

 

Note that when HSYNC Start is programmed equal to HBLANK Start, both HSYNC and HBLANK will

 

 

 

 

be asserted on the same pixel clock.

 

 

 

 

 

 

 

 

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Image 335
Intel 815 manual HSYNC-Horizontal Sync Register