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參數(shù)資料
| 型號： | GM5115-H |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | ONPANEL LCD PANEL CONTROLLER |
| 中文描述： | ONPANEL液晶顯示器控制器 |
| 文件頁數(shù)： | 44/58頁 |
| 文件大?。?/td> | 1505K |
| 代理商： | GM5115-H |
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Genesis Microchip Confidential ***
gm5115/25 Preliminary Data Sheet
June 2002
35
C5115-DAT-01H
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The gm5115/25 has a fully programmable, high-quality OSD controller. The graphics are divided
into “cells” 12 by 18 pixels in size. The cells are stored in an on-chip static RAM (4096 words by
24 bits) and can be stored as 1-bit per pixel data, 2-bit per pixel data or 4-bit per pixel data. This
permits a good compression ratio while allowing more than 16 colors in the image.
Some general features of the gm5115/25 OSD controller include:
OSD Position –
The OSD menu can be positioned anywhere on the display region. The reference
point is Horizontal and Vertical Display Background Start (DH_BKGND_START and
DV_BKGND_START in Figure 19).
OSD Stretch –
The OSD image can be stretched horizontally and/or vertically by a factor of two,
three, or four. Pixel and line replication is used to stretch the image.
OSD Blending –
Sixteeen levels of blending are supported for the character-mapped and
bitmapped images. One host register controls the blend levels for pixels with LUT values of 128
and greater, while another host register controls the blend levels for pixels with LUT values of
127 and lower. OSD color LUT value 0 is reserved for transparency and is unaffected by the
blend attribute.
4.14.1 On-Chip OSD SRAM
The on-chip static RAM (4096 words by 24 bits) stores the cell map and the cell definitions.
In memory, the cell map is organized as an array of words, each defining the attributes of one
visible character on the screen starting from upper left of the visible character array. These
attributes specify which character to display, whether it is stored as 1, 2 or 4 bits per pixel, the
foreground and background colors, blinking, etc.
Registers CELLMAP_XSZ and CELLMAP_YSZ are used to define the visible area of the OSD
image. For example, Figure 25 shows a cell map for which CELLMAP_XSZ =25 and
CELLMAP_YSZ =10.
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