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參數(shù)資料
| 型號(hào)： | GM2121 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SXGA LCD Monitor Controller with Integrated Analog Interface and Dual LVDS Transmitter |
| 中文描述： | SXGA液晶顯示器控制器集成模擬接口和雙路LVDS發(fā)送器 |
| 文件頁(yè)數(shù)： | 36/51頁(yè) |
| 文件大小： | 489K |
| 代理商： | GM2121 |
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gm2121 Preliminary Data Sheet
Note that the cell map and the cell definitions share the same on-chip RAM. Thus, the size of the cell map
can be traded off against the number of different cell definitions. In particular, the size of the OSD image
and the number of cell definitions must fit in OSD SRAM. That is, the following inequality must be
satisfied. (Note, the ROUND operation rounds 3.5 to 4).
C2121-DAT-01F
36
December 2002
http://www.genesis-microchip.com
(CELLMAP_XSZ+1) * CELLMAP_YSZ +
18 * ROUND(Number of 1-bit per pixel fonts / 2) +
18 * (Number of 2-bit per pixel fonts) +
36 * (Number of 4-bit per pixel fonts) <= 4096
For example, an OSD menu 360 pixels wide by 360 pixels high is 30 cells in width and 20 cells in height.
Many of these cells would be the same (e.g. empty). In this case, the menu could contain more than 32 1-
bit per pixel cells, 100 2-bit per pixel cells, and 16 4-bit per pixel cells. Of course, different numbers of
each type can also be used.
4.13.2 Color Look-up Table (LUT)
Each pixel of a displayed cell is resolved to an 8-bit color code. This selected color code is then
transformed to a 24-bit value using a 256 x 24-bit look up table. This LUT is stored in an on-chip RAM
that is separate from the OSD RAM. Color index value 0x00 is reserved for transparent OSD pixels.
4.14 On-Chip Microcontroller (OCM)
The gm2121 on-chip microcontroller (OCM) serves as the system microcontroller. It programs the
gm2121 and manages other devices in the system such as the keypad, the back light and non-volatile
RAM (NVRAM) using general-purpose input/output (GPIO) pins.
The OCM can operate in two configurations, Standalone configuration and Full-Custom configuration, as
illustrated in Figure 25.
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