Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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12.3.21. S_SLADD—Source Scan Line Address

Memory Offset Address:

40074h

Default:

 

None

Attributes:

 

RO; DWord accessible

31

26

25

0

 

 

 

Reserved. Must

 

Source Scan Line Address Bits [25:0]

 

 

 

 

be Zero

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

Descriptions

 

 

 

 

 

31:26

 

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

 

 

 

 

 

25:0

 

Source Scan Line Address. These 26 bits are used by the over scan line fetching state machine to

 

 

 

 

address the source data. Source data is read when ever there is room in the internal memory buffer to

 

 

 

 

avoid the read latency between scan lines.

 

 

 

 

 

 

 

 

NOTES: This is a working register. If this register is read while the BLT Engine is busy, the contents are unpredictable.

12.3.22. D_SLH—Destination Scan Line Height

Memory Offset Address:

40078h

Default:

None

Attributes:

RO; DWord accessible

D_SLH is a working register, which contains the current height that the over scan line state machine uses.

 

31

16

15

0

 

 

Destination Scan Line Height

 

 

Reserved. Must be Zero

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

Descriptions

 

 

31:16 Destination Scan Line Height. These 16 bits specify the height of the destination data in terms of the number of scan lines.

15:0 Reserved. Must be Zero.

NOTES: This is a working register. If this register is read while the BLT Engine is busy, the contents are unpredictable.

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Intel 815 manual SSLADD-Source Scan Line Address, DSLH-Destination Scan Line Height