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CS5530 数据表(PDF) 132 Page - National Semiconductor (TI) |
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CS5530 数据表(HTML) 132 Page - National Semiconductor (TI) |
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132 / 241 page  www.national.com 132 Revision 4.1 Functional Description (Continued) 3.8.3 Video Overlay The video data from the color-space converter is then mixed with the graphics data based upon the video win- dow position. The video window position is programmable via the Video X and Y Position Registers (F4BAR+Mem- ory Offset 08h and 0Ch). A color-keying mechanism is employed to compare either the source (video) or destina- tion (graphics) color to the color key programmed via the Video Color Key Register (FBAR+Offset 14h) and to select the appropriate pixel for display within the video window. The range of the color key is programmable by setting the appropriate bits in the Video Color Mask Reg- ister (F4BAR+Memory Offset 18h). This mechanism greatly reduces the software overhead for computing visi- ble pixels, and ensures that the video display window may be partially occluded by overlapping graphics data. Tables 3-73 and 3-74 show the bit formats for these regis- ters The CS5530 accepts graphics data over the PIXEL[23:0] interface from the GXLV processor at the screen DOT clock rate. The CS5530 is capable of displaying graphics resolutions up to 1600x1200 at color depths up to 24 bits per pixel (bpp) while simultaneously overlaying a video window. Table 3-73. Video X and Y Position Registers Bit Description F4BAR+Memory Offset 08h-0Bh Video X Register (R/W) Reset Value = xxxxxxxxh 31:27 Reserved: Set to 0. 26:16 VideoXEndPosition: This field represents the horizontal end position of the video window according to the following formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13. 15:11 Reserved: Set to 0. 10:0 Video X Start Position: This field represents the horizontal start position of the video window according to the following formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13. F4BAR+Memory Offset 0Ch-0Fh Video Y Register (R/W) Reset Value = xxxxxxxxh 31:27 Reserved: Set to 0. 26:16 VideoYEndPosition: This field represents the vertical end position of the video window according to the following for- mula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1. 15:11 Reserved: Set to 0. 10:0 Video Y Start Position: This field represents the vertical start position of the video window according to the following for- mula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1. Table 3-74. Video Color Registers Bit Description F4BAR+Memory Offset 14h-17h Video Color Key Register (R/W) Reset Value = xxxxxxxxh 31:24 Reserved: Set to 0. 23:0 Video Color Key: This field represents the video color key. It is a 24-bit RGB value. The graphics or video data being compared may be masked prior to the compare by programming the Video Color Mask register appropriately. F4BAR+Memory Offset 18h-1Bh Video Color Mask Register (R/W) Reset Value = xxxxxxxxh 31:24 Reserved: Set to 0. 23:0 Video Color Mask: This field represents the video color mask. It is a 24-bit RGB value. Zeroes in the mask cause the corresponding bits in the graphics or video stream being compared to be ignored. |
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