Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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12.3.3.BR02—Clip Rectangle Y1 Address

Memory Offset Address:

40008h

Default:

None

Attributes:

RO; DWord accessible

BR02 is loaded by either the SETUP_BLT or SETUP_MONO_PATTERN_SL_BLT instructions and is used with PIXEL_BLT, SCANLINE_BLT, or TEXT_BLT instructions.

 

31

26

25

0

 

 

Reserved. Must

 

Clip Rectangle Y1 Address Bits [25:0]

 

 

 

be Zero

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

Descriptions

 

 

 

 

 

31:26

 

Reserved. Must be Zero. The maximum GC graphics address is 64 MB.

 

 

 

 

 

25:0

 

Clip Rectangle Y1 Address Bits [25:0]. These 26 bits specify the top clipping address of the

 

 

 

destination data. This clip compare is inclusive: draw if destination address is greater than or equal to

 

 

 

this address. This address points to the first address of a scan line. The Clip Rectangle X registers

 

 

 

take care of the pixel positions within a scan line.

 

 

 

 

 

 

 

12.3.4.BR03—Clip Rectangle Y2 Address

Memory Offset Address:

4000Ch

Default:

None

Attributes:

RO; DWord accessible

BR03 is loaded by either the SETUP_BLT or SETUP_MONO_PATTERN_SL_BLT instructions and is used with PIXEL_BLT, SCANLINE_BLT, or TEXT_BLT instructions.

 

31

26

25

0

 

 

Reserved. Must

 

Clip Rectangle Y2 Address Bits [25:0]

 

 

 

be Zero

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

Descriptions

 

 

 

 

 

31:26

 

Reserved. Must be Zero. The maximum GC graphics address is 64 MBs. Debug implementation

 

 

 

specific = Leftdiscard[11:06]

 

 

 

 

 

 

 

25:0

 

Clip Rectangle Y2 Address Bits [25:0]. These 26 bits specify the bottom clipping address of the

 

 

 

destination data. This clip compare is inclusive: draw if destination address is less than or equal to this

 

 

 

address. This address points to the first byte of a scan line. The Clip Rectangle X registers take care

 

 

 

of the pixel positions within a scan line.

 

 

 

 

 

 

 

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Image 188
Intel 815 manual 12.3.3. BR02-Clip Rectangle Y1 Address, 12.3.4. BR03-Clip Rectangle Y2 Address