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| 型号： | GMZAN3T |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA ALALOG INTERFACE LCD MONITOR CONTROLLER |
| 中文描述： | ALALOG的XGA液晶显示器接口控制器 |
| 文件页数： | 28/53页 |
| 文件大小： | 556K |
| 代理商： | GMZAN3T |
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gmZAN3 Preliminary Data Sheet
C0523-DAT-01G
34
July 2003
Ge nes i s Microc hip Confid e n tia l
http:// w ww . g enesis-mic r ochip.com
4.5.3 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.
4.5.4 Internal Odd/Even Field Detection (For Interlaced Inputs to ADC Only)
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 20.
ODD/EVEN Field Detection
4.5.5 Input Pixel Measurement
The gmZAN3 provides a number of pixel measurement functions intended to assist in configuring system
parameters such as ACLK frequency (sample clocks per line) and phase setting, centering the image, or
adjusting the contrast and brightness.
4.5.6 Image Phase Measurement
This function measures the sampling phase quality over a selected active window region. This feature
may be used when programming the source DDS to select the proper phase setting.
4.5.7 Image Boundary Detection
The gmZAN3 performs measurements to determine the image boundary. This information is used when
programming the Active Window and centering the image.
4.5.8 Image Auto Balance
The gmZAN3 performs measurements on the input data that is used to adjust brightness and contrast.
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