F65510 Vertical Total Register - Intel Corporation

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F65510

Manufacturer Part Number
F65510
Description
Controllers, Flat Panel VGA Controller
Manufacturer
Intel Corporation
Datasheet
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VERTICAL TOTAL REGISTER (CR06)
Read/Write at I/O Address 3B5h/3D5h
Index 06h
Group 0 Protection
D7 D6 D5 D4 D3 D2 D1 D0
Revision 0.7
This register is used in all modes.
7-0
Vertical Total
These are the 8 low order bits of a 10-bit
register. The 9th and 10th bits are located in
the CRT Controller Overflow Register. The
Vertical Total value specifies the total
number of scan lines (horizontal retrace
periods) per frame.
Programmed Count = Actual Count – 2
®
V Total (Scan Lines)
(Lower 8 Bits)
49
OVERFLOW REGISTER (CR07)
Read/Write at I/O Address 3B5h/3D5h
Index 07h
Group 0 Protection on bits 0-3 and bits 5-7
Group 3 Protection on bit 4
D7 D6 D5 D4 D3 D2 D1 D0
This register is used in all modes.
0
1
2
3
4
5
6
7
Vertical Total Bit 8
Vertical Display Enable End Bit 8
Vertical Sync Start Bit 8
Vertical Blank Start Bit 8
Line Compare Bit 8
Vertical Total Bit 9
Vertical Display Enable End Bit 9
Vertical Sync Start Bit 9
CRT Controller Registers
V Total Bit 8
V DE End Bit 8
V Sync Start Bit 8
V Blank Start Bit 8
Line Compare Bit 8
V Total Bit 9
V DE End Bit 9
V Sync Start Bit 9
Preliminary 65510

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