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參數(shù)資料
| 型號(hào)： | STV9427 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
| 中文描述： | 高速M(fèi)ULTISYNCH屏幕的監(jiān)視器顯示 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 558K |
| 代理商： | STV9427 |
FUNCTIONAL DESCRIPTION
(continued)
Figure 7 :
Hozizontal Timing
HSYNC
R, G, B
LD[6:1] = 40
DD[7:0] = 10
Nber of characters
of the row
1
6 7
80 81
6.5
Active OSD Video
9
IV - Clock and Timing
The whole timing is derived from the XTI and the
horizontal SYNCHRO input frequencies. The XTI
input frequency can be an external clock, crystal
or a ceramic resonator signal thanks to XTI/XTO
pins. The value of this frequency can be chosen
between 6 and 15MHz is used by the PLL to
generate a pixel clock locked on the horizontal
synchro input signal.
IV.1 - Horizontal Timing
(see Figure 7)
The number of pixel periods is given by the LINE
DURATION register and is equal to :
[LD[6:1] x 2 + 1 ] x 12.
(LD[6:1] : value of the LINE DURATION register).
This value allows to define the horizontal size of the
characters.
The horizontal left margin is given by the HORI-
ZONTAL DELAY register and is equal to :
(DD[7:0] -6 ) x 6 + 54
(DD[7:0] : value of the DISPLAY DELAY register).
This value allows to define the horizontal position
of the characters on the screen. Due to internal
logic, minimum horizontal delay is fixed at 4.5
characters (54 pixel) when DD is even and lower
or equal to 6, and it is fixed at 5 characters (60 pixel)
when DD is odd and lower or equal to 7.
IV.2 - D to A Timing
(STV9427)
The D/A converters of the STV9427 are pulse width
modulator converter.
The frequency of the output signal is :
the duty cycle is :
Vi[7:0]
f
XTAL
256
x
6
and
256 x 6
per cent.
After a low pass filter, the average value of the
output is :
Vi [7:0]
256 x 6
V
DD
V - Display Control
A screen is composed of successive scanlines gath-
ered in several strips. Each strip is defined by a
descriptor stored in memory. A table of descriptors
allows screen composition and different tables can
be stored in memory at the page addresses
(16 possible
≠
addresses). Two types of strips are
available :
- Spacing strip : its descriptor (see II) gives the
number of black (FBK = 1 in DISPLAY CONTROL
register) or transparent (FBK = 0) lines.
- Character strip : its descriptor gives the memory
address of the character codes corresponding to
the 1
st
displayed character. The characters and
attributes (see code format III) are defined by a
succession of codes stored in the RAM at ad-
dresses starting from the 1
st
one given by the
descriptor. A character strip can be displayed or
not by using the DE bit of its descriptor.
After the VSYNC edge, the first strip descriptor is
read at the top of the current table of descriptors at
the address given by P[9:0] (see DISPLAY CON-
TROL register) ; if it is a spacing strip, SL[7:0] black
or transparent scan lines are displayed ; if it is a
character strip, during CH[5:0] scan lines (CH[5:0]
given by the CHARACTER HEIGHT register), the
character codes are read at the addresses starting
from the 1
st
one given by the descriptor until a end
of line character or the end of the scan line ; the
next descriptor is then read and the same process
is repeated until the next edge of VSYNC.
1
128
255
V1[7:0]
T
XTAL
256 . T
XTAL
PWM1 Signal
0
9
Figure 8 :
PWM Timing
STV9427 - STV9428 - STV9429
13/20
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV9428 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
| STV9428-STV9429 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
| STV9429 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
| STV942X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EVALUATION KIT OSD FOR MONITORS |
| STV9432 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100MHz OSD FOR MONITOR |
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