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数据搜索系统，热门电子元器件搜索 |
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STV3550 数据表(PDF) 39 Page - STMicroelectronics |
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STV3550 数据表(HTML) 39 Page - STMicroelectronics |
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39 / 144 page  Graphics Functional Description STV3550 39/144 ● A color palette which defines the colors in the SDRAM. Up to 256 colors can be used by the bitmap. If required, one of these colors can be “transparent” allowing the background to show through. These colors are loaded in the OSD CLUT. ● A bitmap composed of 2 blocks of 32-bit words. CAUTION: When 2 regions are displayed one after the other, there must be at least one TV scan line between them with nothing displayed. This enables the OSD to reload the 256 colors in the CLUT. OSD specifications are stored as linked lists, as shown in Figure 28 and Figure 29. The order that the specifications are stored in SDRAM is the order that the regions are displayed on the screen. This self-chained mode is managed by software by programming the address of the next OSD region to be displayed in the Next OSD Specification pointer (OSDp[31:0]). The Stop Linked List (SLL) bit indicates the last specification in the list. An OSD specification can be placed anywhere within the entire 64-Mbit SDRAM. Each OSD region displayed on the screen is the object of an OSD specification. The position of the first OSD region Figure 28: OSD Specification Linked Lists SDRAM SLL = 1 = 0 the end of Region 2. The OSD will stop at Free Space Bottom Field Block 1 Free Space Header 1 Palettep[31:0] Bottomp[31:0] Topp[31:0] Memory space between Header, Palette, Top and Bottom Field blocks First Specification Address register OSDp[31:0] Free Space Top Field Block 1 Free Space Palette 1 Free Space Bottom Field Block 2 Free Space Header 2 Free Space Top Field Block 2 Free Space Palette 2 Header 3 |
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