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Revision 3.1

Integrated Functions (Continued)

4.4.3.1

Monochrome Patterns

Monochrome patterns are selected by setting the pattern

mode to 01b in the GP_RASTER_MODE register

(GX_BASE+ 8200h). Those pixels corresponding to a

clear bit (0) in the pattern are rendered using the color

specified in the GP_PAT_COLOR_0 register, and those

pixels corresponding to a set bit (1) in the pattern are ren-

dered using the color specified in the GP_PAT_COLOR_1

If the pattern transparency bit is set high in the

GP_RASTER_MODE register, those pixels corresponding

to a clear bit in the pattern data are not drawn.

Monochrome patterns use bits [63:0] of the pattern data.

Bits [7:0] correspond to the first row of the pattern, and bit

7 corresponds to the leftmost pixel on the screen. This is

illustrated in Figure 4-12.

Figure 4-12. Example of Monochrome Patterns

4.4.3.2

Dither Patterns

Dither patterns are selected by setting the pattern mode

to 10 b in the GP_RASTER_MODE register (Table 4-25

on page 125). Two bits of pattern data are used for each

pixel, allowing color expansion to four colors. The colors

are

specified

the

GP_PAT_COLOR_0

through

GP_PAT_COLOR_3 registers (Table 4-25 on page 125).

Dither patterns use all 128 bits of pattern data. Bits [15:0]

correspond to the first row of the pattern (the lower byte

contains the LSB of the pattern color and the upper byte

contains the MSB of the pattern color). This is illustrated

in Figure 4-13.

Figure 4-13. Example of Dither Patterns

GP_PAT_DATA_0 = 0x80412214

GP_PAT_DATA_1 = 0x08142241

00AA

4411

00AA

1155

00AA

4411

00AA

1155

GP_PAT_DATA_0 = 0x441100AA

GP_PAT_DATA_1 = 0x115500AA

GP_PAT_DATA_2 = 0x441100AA

GP_PAT_DATA_3 = 0x115500AA

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