M69030 Asiliant Technologies, M69030 Datasheet - Page 146

• 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

9-44
CR78
read/write at I/O address 3B5h/3D5h with index at address 3B4h/3D4h set to 78h
shadowed only for pipeline B
7
6-5
4-0
`efmp
A
B
Redux En

Vertical
Vertical Reduction Enable
Reserved
Vertical Reduction Line Dropping Interval
69030 Databook
(0)
7
NTSC/PAL Vertical Reduction Register
0: Vertical reduction is disabled. This is the default after reset.
1: Vertical reduction is enabled
These bits always return the value of 0 when read.
When bit 7 of this register is set to 1, these 5 bits specify the number of scanlines remaining
(those which will be drawn on the display) between each of the scanlines that are to be
dropped (those which will NOT be drawn on the display).
Reserved
(0)
6
4 3 2 1 0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
1 1 1 1 1
Reserved
Bit
to
(0)
5
CRT Controller Registers
Number of Scanlines Remaining
Between Dropped Scanlines
4
reserved
Reserved
Reserved
31
to
2
Vertical Reduction Line Dropping Interval
3
(0:0000)
2
Revision 1.3 11/24/99
1
0