M69030 Asiliant Technologies, M69030 Datasheet - Page 207

• 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

XR88
read-only at I/O address 3D7h with 3D6h set to Index 88h
shared by both pipelines A and B
7
6
5-4
3-2
1
0
`efmp
A
&
B
Location En
Alt Font

Alternate Font Location Enable
Reserved
Font Select
Pipeline Vertical Blanking Trigger Select
Font Copy Status and Trigger
Reserved
(0)
69030 Databook
7
Alternate Font Location Control
0: Disables having the alternate font location in the frame buffer.
1: Enables having the alternate font location in the frame buffer.
This bit always returns the value of 0 when read.
These two bits select which fonts from VGA-compatible locations in plane 2 will be copied
to the alternate font location.
These two bits select which pipeline’s vertical blanking events will be used to increment the
counter that triggers the copying of fonts from VGA-compatible locations to the alternate
font location.
When read, this bit indicates whether or not a copy operation is in progress.
0: No copy operation is currently in progress.
1: A copy operation is currently in progress.
When written, this bit can be used to immediately trigger a copy operation regardless of the
current state of the counter.
0: Does not immediately trigger a copy operation. Writing a 0 to this bit does nothing.
1: Immediately triggers a copy operation.
This bit always returns the value of 0 when read.
Bits
Bits
5 4
0 0
0 1
1 0
1 1
5 4
0 0
0 1
1 0
1 1
Reserved
(0)
6
Font Selected
No fonts are selected, and all use of the alternate font location is disabled
just as if bit 7 of this register were set to 0.
Font A, the one pointed to by bits 5, 3 and 2 of SR03 is selected.
Font B, the one pointed to by bits 4, 1 and 0 of SR03 is selected.
Both fonts A and B (i.e., both the font pointed to by bits 5, 3 and 2 of SR03,
and the font pointed to by bits 4, 1 and 0 of SR03) are selected.
Font Selected
No fonts are selected, and all use of the alternate font location is disabled
just as if bit 7 of this register were set to 0.
Font A, the one pointed to by bits 5, 3 and 2 of SR03 is selected.
Font B, the one pointed to by bits 4, 1 and 0 of SR03 is selected.
Both fonts A and B (i.e., both the font pointed to by bits 5, 3 and 2 of SR03,
and the font pointed to by bits 4, 1 and 0 of SR03) are selected.
5
Font Select
(00)
Extension Registers
4
Pipeline Vertical Blanking
3
Trigger Select
(00)
2
Stat & Trig
Font Copy
Revision 1.3 11/24/99
(0)
1
Reserved
(0)
0
14-27