M69030 Asiliant Technologies, M69030 Datasheet - Page 110
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M69030
Manufacturer:
CHIPS
Quantity:
20 000
Part Number:
M69030P
Manufacturer:
MIT
Quantity:
20 000
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9-8
CR06
read/write at I/O address 3B5h/3D5h with index at address 3B4h/3D4h set to 06h
shadowed for pipelines A and B
7-0
`efmp
A
B
Vertical Total Bits
69030 Databook
7
Vertical Total Register
These bits provide the 8 least significant bits of either 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 these 8 bits of this register, and the 2 most significant bits are supplied by
bits 5 and 0 of the Overflow Register (CR07).
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 the vertical total are
supplied by the 8 bits of this register (CR06). The 4 most significant bits are supplied by
bits 3-0 of the Extended Vertical Total Register (CR30).
This 10-bit or 12-bit value should be programmed to equal the total number of scanlines
minus 2.
6
5
CRT Controller Registers
Vertical Total Bits 7-0
Vertical Total Bits 7-0
4
3
2
Revision 1.3 11/24/99
1
0
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