GXM Datasheet, PDF (127/244 Pages) National Semiconductor (TI) – Geode™ GXm Processor Integrated x86 Solution with MMX Support

Integrated Functions (Continued)
Table 4-25. Graphics Pipeline Configuration Registers (Continued)
Bit
Name Description
GX_BASE+8200h-8203h
GP_RASTER_MODE Register (R/W)
Default Value = 00000000h
31:13
12
11
10
9:8
7:0
RSVD
TB
ST
PT
PM
ROP
Reserved: Set to 0.
Transparent BLIT: When set, this bit enables transparent BLIT. The source color data will be compared to a
color key and if it matches, that pixel will not be drawn. The color key value is stored in the BLIT buffer as
destination data. The raster operation must be set to C6h, and the pattern registers must be all F’s for this
mode to work properly.
Source Transparency: Enables transparency for monochrome source data. Those pixels corresponding to
clear bits in the source data are not drawn.
Pattern Transparency: Enables transparency for monochrome pattern data. Those pixels corresponding to
clear bits in the pattern data are not drawn.
Pattern Mode: Specifies the format of the pattern data.
00 = Indicates a solid pattern. The pattern data is always sourced from the GP_PAT_COLOR_0 register.
01 = Indicates a monochrome pattern. The pattern data is sourced from the GP_PAT_COLOR_0 and
GP_PAT_COLOR_1 registers.
10 = Indicates a dither pattern. All four pattern color registers are used.
11 =Indicates a color pattern. The pattern data is sourced directly from the pattern data registers.
Raster Operation: Specifies the raster operation for pattern, source, and destination data.
GX_BASE+8204h-8207h
GP_VECTOR_MODE Register (R/W)
Default Value = 00000000h
31:4
RSVD Reserved: Set to 0.
3
DEST Read Destination Data: Indicates that frame-buffer destination data is required.
2
DMIN Minor Direction: Indicates a positive minor axis step.
1
DMAJ Major Direction: Indicates a positive major axis step.
0
YMAJ Major Direction: Indicates a Y Major vector.
GX_BASE+8208h-820Bh
GP_BLT_MODE Register (R/W)
Default Value = 00000000h
31:9
RSVD Reserved: Set to 0.
8
Y
Reverse Y Direction: Indicates a negative increment for the Y position. This bit is used to control the direc-
tion of screen to screen BLTs to prevent data corruption in overlapping windows.
7:6
SM
Source Mode: Specifies the format of the source data.
00 = Source is a color bitmap.
01 = Source is a monochrome bitmap (use source color expansion).
10 = Unused.
11 = Source is a text glyph (use source color expansion). This differs from a monochrome bitmap in that the
X position is adjusted by the width of the BLT and the Y position remains the same.
5
RSVD Reserved: Set to 0.
4:2
RD
Destination Data: Specifies the destination data location.
000 = No destination data is required. The destination data into the raster operation unit is all ones.
010 = Read destination data from BLT Buffer 0.
011 = Read destination data from BLT Buffer 1.
100 = Read destination data from the frame buffer (store temporarily in BLT Buffer 0).
101 = Read destination data from the frame buffer (store temporarily in BLT Buffer 1).
1:0
RS
Source Data: Specifies the source data location.
00 = No source data is required. The source data into the raster operation unit is all ones.
01 = Read source data from the frame buffer (temporarily stored in BLT Buffer 0).
10 = Read source data from BLT Buffer 0.
11 = Read source data from BLT Buffer 1.
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