User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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17.4. VTOTAL—Vertical Total Register
Address Offset: 6000Ch
Default Value: 00000000h
Access: Read/Write
Size: 32 bits
31 28 27 16
Reserved Vertical Total Display Pixels
15 11 10 0
Reserved Vertical Active Display Pixels
Bit Description
31:28 Reserved.
27:16 Vertical Total Display Pixels. Total vertical display lines. This 12-bit field provides a vertical total up to
4096 lines encompassing 2048 active display lines, top/bottom border lines and vertical retrace period.
15:11 Reserved.
10:0 Vertical Active Display Pixels. Active vertical display lines. This 11-bit field provides vertical active
display resolution up to 2048 lines. Note that the first vertical active display line always starts at 0.