User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
202
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
be Zero
Source Scan Line Address Bits [25:0]
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.