M69030 Asiliant Technologies, M69030 Datasheet - Page 110

• Manufacturer Part Number: M69030
• Manufacturer: Asiliant Technologies

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

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