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參數(shù)資料
| 型號： | GM5060-H |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | GRAPHICS PROCESSING IC PROVIDING HIGH QUALITY IMAGES FOR LCD MONITORS |
| 中文描述： | 圖形處理芯片提供高品質(zhì)的圖像液晶顯示器 |
| 文件頁數(shù)： | 62/85頁 |
| 文件大?。?/td> | 1375K |
| 代理商： | GM5060-H |
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Genesis Microchip
gm5060 / gm5060-H Data Sheet
February 2002
C5060-DAT-01G
54
Character Mapped OSD Features:
Vertical and/or horizontal magnification of OSD image
Maximum OSD size: 50 characters horizontal x 20 vertical with full character palette defined
Background Windows Programming support to define an area in the OSD
16 levels of blending - suitable for fade effects
Support for portrait and landscape OSDs (90
0
rotated fonts)
Pre and post filter merge of OSD into main graphics channel
Host update of OSD image while OSD is enabled
4.15.1.1. Character Map and On-chip Font Table
The content of the character map specifies the message generated by the OSD.
The character map for the OSD screen is defined by writing into an on-chip character map
SRAM (3594 words by 24 bits) by means of the host interface. This on-chip memory is also used
to store programmable font characters, if the fonts are not stored in external frame buffer
memory.
In memory, the character map is organized as an array of words, each defining the attributes
(which character to display, the foreground and background colors, blinking) of one visible
character on the screen (starting from upper left of the visible character array). In addition, there
is a row attribute word that appears at the beginning of each row of the array in memory (so that
the width of the array in memory is one higher than the width of the visible character array). The
format of these words is described below.
Registers CHARMAP_XSZ and CHARMAP_YSZ are used to define the visible area of the OSD
image. For example, Figure 46 shows a character map for which CHARMAP_XSZ =25 and
CHARMAP_YSZ =10.
Figure 46. OSD Character Map
Note that when using on-chip programmable fonts, the character map and the font table share the
same on-chip RAM. Thus, the size of the character map can be traded off against the number of
CHARMAP_YSZ
CHARMAP_XSZ
Address0:
Row Attribute
for 1
Row
Address 1:
Character Attributes for
character in upper-left
Address 25:
Character Attributes for
character in upper-right
Address26:
Row Attribute
for 2
Row
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