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參數(shù)資料
| 型號： | GM5120-H |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA/SXGA LCD Controller |
| 中文描述： | 的XGA / SXGA LCD控制器 |
| 文件頁數(shù)： | 30/51頁 |
| 文件大?。?/td> | 1379K |
| 代理商： | GM5120-H |
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Genesis Microchip Confidential ***
gm5110/20 Preliminary Data Sheet
June 2002
23
C5110-DAT-01C
counter and HSYNC is used to increment it, any difference in the relative position of
HSYNC and VSYNC is seen on-screen as vertical jitter. By delaying the HSYNC a small
amount, it can be ensured that VSYNC always resets the line counter prior to it being
incremented by the “first” HSYNC.
delayed HS placed safely within blanking
active data crosses HS boundary
Data
HS (system)
Internal Delayed HS
Figure 15.
Active Data Crosses HSYNC Boundary
4.6.2 Horizontal and Vertical Measurement
The IFM is able to measure the horizontal period and active high pulse width of the HSYNC
signal, in terms of the selected clock period (either TCLK or RCLK/4.). Horizontal
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.
4.6.3 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.
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