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參數(shù)資料
| 型號(hào)： | STV942X |
| 英文描述： | EVALUATION KIT OSD FOR MONITORS |
| 中文描述： | 評(píng)估板顯示器的OSD |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 282K |
| 代理商： | STV942X |
II.3 - Board Layout
Figure 5
JB04BX
Connected
to Target Monitor
(PC Monitor)
Connected
to Video Source
(PC Video Board)
Connected
to I
2
C Interface
Board
Socket for STV9422
Socket for STV9421
Note :
Only ONE OSD must be installed on board.
9
II.4 - Demo Board Operation
The STV942x Demo board is designed to be in-
serted into a VGA connection.
The video signals generated by the OSD device are
mixed with the incoming video signals at the input
connector J5. The combination of both signals is
available on the output connector J6. The mixing is
done with the
video switch/triple DAC : STV8438
.
This device provides a triple analog video input, a
triple digital video input, a video switch and three
buffers for 75
drive. It operates at 100MHz on the
analog input and on the video switch, and up to
70MHz on the digital inputs. In this application, the
three 8 bits converters are used as 3 single bit
converters as the OSD provides 1 bit RGB signals.
A
ST6 micro controller
gives the board the ability
to run a small stand-alone demo program : It deliv-
ers two Horizontal and vertical synchronization sig-
nals, at about 31kHz and 60Hz, and drives the OSD
I
2
C bus. As soon as an external sync is detected on
the input VGA connector, the mcu stops delivering
its own sync and it transmits the input sync signals
to the VGA output connector. In a same manner, as
soon as the mcu detects an external master on the
I
2
C bus, it stops driving its demo program.
The Demo board can be equipped either with a
STV9421 OSD (on socket U1), or with a STV9422
OSD (on socket U2) Never put both OSDs on the
board at the same time !!
STV942x - DEMO KIT
5/9
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