Volume 3, Part 2 - Display Registers - Codon.org.uk

5 Cursor Mode Select
CURACNTR—Cursor A Control Register
Bit 5 Bits Mode
2:0
0 000 Cursor is disabled. This is the default after reset. When the cursor register value
changes from enabled to disabled, the cursor will stop fetching data at the following
VBLANK event.
The cursor enable can be overridden by the pipe cursor disable bit. The value of these
bits do not change when disabled by the pipe cursor disable bit.
0 001 Reserved
0 010 128 x 128 32bpp AND/INVERT (not available for VGA use)
See description off 64 x 64 32bpp AND/INVERT format for byte usage
0 011 256 x 256 32bpp AND/INVERT (not available for VGA use)
See description off 64 x 64 32bpp AND/INVERT format for byte usage
0 100 64 x 64 2bpp Indexed 3-color and transparency mode
0 101 64 x 64 2bpp Indexed AND/XOR 2-plane mode
0 110 64 x 64 2bpp Indexed 4-color mode
0 111 64 x 64 32bpp AND/INVERT (not available for VGA use)
For each pixel:
Least significant three bytes provides cursor RGB 888 color information
Most Significant Byte:
All Ones: Opaque, show the cursor color
All Zeros: Transparent (color must also equal zero)
Other: Invert the underlying display pixel data (ignore the color)
1 000 Reserved
1 001 Reserved
1 010 128 x 128 32bpp ARGB (8:8:8:8 MSB-A:R:G:B) (not available for VGA use)
1 011 256 x 256 32bpp ARGB (8:8:8:8 MSB-A:R:G:B) (not available for VGA use)
1 100 64 x 64 32bpp AND/XOR (not available for VGA use)
For each pixel:
Least significant three bytes provides cursor RGB 888 color information
Most Significant Byte:
All Ones: Opaque, show the cursor color
All Zeros: Transparent (color must also equal zero)
Other: XOR the cursor color with the underlying display pixel data
1 101 128 x 128 32bpp AND/XOR (not available for VGA use)
See description off 64 x 64 32bpp AND/XOR format for byte usage
1 110 256 x 256 32bpp AND/XOR (not available for VGA use)
See description off 64 x 64 32bpp AND/XOR format for byte usage
1 111 64 x 64 32bpp ARGB (8:8:8:8 MSB-A:R:G:B) (not available for VGA use)
4:3 Reserved Project: All Format:
2:0 Cursor_Mode_Select[2:0]
Project:
All
Default Value: 0b
These three bits together with bit 5 select the mode for cursor as shown in the table described in bit 5.
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