M69030 Asiliant Technologies, M69030 Datasheet - Page 158

• 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

11-2
GRX
read/write at I/O address 3CEh
this register is cleared to 00h by reset.
7-4
3-0
GR00
read/write at I/O address 3CFh with index at address 3CEh set to 00h
shared by both pipelines A and B
7-4
3-0
`efmp
A
&
B
7

Reserved
Graphics Controller Register Index
Reserved
Set/Reset Plane 3 through Set/Reset Plane 0
69030 Databook
7
Graphics Controller Index Register
Set/Reset Register
These four bits are used to select any one of the graphics controller registers, GR00
through GR08, to be accessed via the data port at I/O location 3CF.
When the Write Mode bits (bits 0 and 1) of the Graphics Mode Register (GR05) are set to
select Write Mode 0, all 8 bits of each byte of each memory plane are set to either 1 or 0
as specified in the corresponding bit in this register if the corresponding bit in the Enable
Set/Reset Register (GR01) is set to 1.
When the Write Mode bits (bits 0 and 1) of the Graphics Mode Register (GR05) are set to
select Write Mode 3, all CPU data written to the frame buffer is rotated, then logically
ANDed with the contents of the Bit Mask Register (GR08) and then treated as the
addressed data’s bit mask, while value of these four bits of this register are treated as the
color value.
6
Reserved
6
Reserved
5
5
Graphics Controller Registers
4
4
Set/Reset
Plane 3
3
3
Graphics Controller Register Index
Set/Reset
Plane 2
2
2
Set/Reset
Plane 1
Revision 1.3 11/24/99
1
1
Set/Reset
Plane 0
0
0