M69030 Asiliant Technologies, M69030 Datasheet - Page 133
M69030
Manufacturer Part Number
M69030
Description
Manufacturer
Asiliant Technologies
Datasheet
1.M69030.pdf
(387 pages)
Specifications of M69030
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Operating Temperature (max)
70C
Rad Hardened
No
Lead Free Status / Rohs Status
Supplier Unconfirmed
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CHIPS
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CR30
read/write at I/O address 3B5h/3D5h with index at address 3B4h/3D4h set to 30h
shadowed for pipelines A and B
7-4
3-0
`efmp
A
B
Reserved
Vertical Total Bits 11-8
69030 Databook
7
Extended Vertical Total Register
These bits should always be written with the value of 0.
The vertical total is a 10-bit or 12-bit value that specifies the total number of scanlines. This
includes the scanlines both inside and outside of the active display area.
In standard VGA modes, where bit 0 of the I/O Control Register (XR09) is set to 0, the
vertical total is specified with a 10-bit value. The 8 least significant bits of the vertical total
are supplied by bits 7-0 of the Vertical Total Register (CR06), and the 2 most significant bits
are supplied by bits 5 and 0 of the Overflow Register (CR07). In standard VGA modes,
these bits 3-0 of this register (CR30) are not used.
In extended modes, where bit 0 of the I/O Control Register (XR09) is set to 1, the vertical
total is specified with a 12-bit value. The 8 least significant bits of this value are supplied
by bits 7-0 of the Vertical Total Register (CR06), and the 4 most significant bits are supplied
by bits 3-0 of this register (CR30).
This 10-bit or 12-bit value should be programmed to be equal to the total number of
scanlines, minus 2.
6
Reserved
Reserved
5
CRT Controller Registers
4
3
Vertical Total Bits 11-8
Vertical Total Bits 11-8
2
Revision 1.3 11/24/99
1
0
9-31
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