B69000 Asiliant Technologies, B69000 Datasheet - Page 331

• Manufacturer Part Number: B69000
• Manufacturer: Asiliant Technologies

Specifications of B69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

D-6
64x64x2bpp 4-Color Mode
This mode provides four colors for drawing the cursor. There is no provision for transparency in the 64x64
pixel space occupied by the cursor so unless the image behind the cursor happens to be the same color as
one of the four colors used to draw the cursor, the cursor will appear to be a 64 x 64 pixel square. Each
pixel position within the cursor is defined by the combination of two bits, each of which is stored in planes
referred to as plane 0 and plane 1.
In this mode, it is possible to have up to 4 different 1KB patterns stored in a 4KB memory space starting at
the base address specified in the low and high base address registers for the given cursor.
The following tables show how the cursor data is organized in memory and the meaning of the two bits for
each pixel position.
&+,36
69000 Databook
Pixel Data
Plane 0
0
0
1
1
Pixel Data
Table D-5: Pixel Data 64x64x2bpp 4-Color Mode
Plane 1
Offset
3FCh
FFCh
00Ch
3F0h
3F4h
3F8h
FF8h
000h
004h
008h
010h
014h
400h
404h
0
1
0
1
Hardware Cursor and Pop Up Window
...
...
Subject to Change Without Notice
Table D-4: Memory Organization
64x64x2bpp 4-Color Mode
Cursor color 0
Cursor color 1
Cursor color 2
Cursor color 3
Color Displayed at the Corresponding Pixel Position
Plane
...
...
0
0
1
1
0
0
0
0
1
1
0
0
1
1
31-0 on line 0 of pattern 0
63-32 on line 0 of pattern 0
31-0 on line 0 of pattern 0
63-32 on line 0 of pattern 0
31-0 on line 1 of pattern 0
63-32 on line 1 of pattern 0
...
31-0 on line 63 of pattern 0
63-32 on line 63 of pattern 0
31-0 on line 63 of pattern 0
63-32 on line 63 of pattern 0
31-0 on line 0 of pattern 1
63-32 on line 0 of pattern 1
...
31-0 on line 63 of pattern 3
63-32 on line 63 of pattern 3
Pixels
Revision 1.3 8/31/98