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參數資料
| 型號： | GM2125 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | ANALOG INTER FACE XGA/SXGA ONPANEL LCD PANEL CONTROLLER |
| 中文描述： | 模擬國際米蘭的XGA / SXGA ONPANEL液晶顯示器控制器 |
| 文件頁數： | 28/54頁 |
| 文件大?。?/td> | 1339K |
| 代理商： | GM2125 |
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***
Genesis Microchip Confidential ***
gm2115/25 Preliminary Data Sheet
June 2002
26
C2115-DAT-01B
measurements are performed on only a single line per frame (or field). The line used is
programmable. It is able to measure the vertical period and VSYNC pulse width in terms of
rising edges of HSYNC.
Once enabled, measurement begins on the rising VSYNC and is completed on the following
rising VSYNC. Measurements are made on every field / frame until disabled.
4.5.3 Format Change Detection
The IFM is able to detect changes in the input format relative to the last measurement and
then alert both the system and the on-chip microcontroller. The microcontroller sets a
measurement difference threshold separately for horizontal and vertical timing. If the current
field / frame timing is different from the previously captured measurement by an amount
exceeding this threshold, a status bit is set. An interrupt can also be programmed to occur.
4.5.4 Watchdog
The watchdog monitors input VSYNC / HSYNC. When any HSYNC period exceeds the
programmed timing threshold (in terms of the selected IFM_CLK), a register bit is set. When
any VSYNC period exceeds the programmed timing threshold (in terms of HSYNC pulses),
a second register bit is set. An interrupt can also be programmed to occur.
4.5.5 Internal Odd/Even Field Detection
The IFM has the ability to perform field decoding of interlaced inputs to the ADC. The user
specifies start and end values to outline a “window” relative to HSYNC. If the VSYNC
leading edge occurs within this window, the IFM signals the start of an ODD field. If the
VSYNC leading edge occurs outside this window, an EVEN field is indicated (the
interpretation of odd and even can be reversed). The window start and end points are
selected from a predefined set of values.
HS
window
VS - even
VS - odd
Window
Start
Window End
Figure 16.
ODD/EVEN Field Detection
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