參數(shù)資料
型號(hào)： LM1236
廠商： National Semiconductor Corporation
英文描述： 150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs
中文描述： 150 MHz的I2C兼容的RGB前置放大器254字符OSD光盤(pán)，512個(gè)字符RAM和4 DAC的內(nèi)置
文件頁(yè)數(shù)： 18/43頁(yè)
文件大?。?/td> 1898K
代理商： LM1236
OSD Generator Operation
PAGE OPERATION
Figure 13
shows the block diagram of the OSD generator.
OSD screens are created using any of the 256 predefined
characters stored in the mask programmed ROM. Each
character has a unique 8-bit code that is used as its address.
Consecutive rows of characters make up the displayed win-
dow. These characters can be stored in the page RAM,
written under I
2
C compatible commands by the monitor mi-
crocontroller. Each row can contain any number of charac-
ters up to the limit of the displayable line length, although
some restrictions concerning the enhanced features apply
on character rows longer than 32 characters. The number of
characters across thw width and height of the page can be
varied under I
2
C compatible control, but the total number of
characters that can be stored and displayed on the screen is
limited to 512 including anmy character row end characters.
The horizontal and vertical start position can also be pro-
grammed through the I
2
C compatible bus.
END-OF-LINE AND END-OF-SCREEN CODES
There are two special character addresses used in the page
RAM, 0x00 (End-Of-Screen) and 0x01 (End-Of-Line). The
first must be used to terminate a window and the second to
terminate a line. Thus, only 254 ROM characters are display-
able.
BLANK CHARACTER REQUIREMENT
Five of the 256 Character ROM should be reserved as blank.
ROM Addresses 0 and 1 are for the use of the End-Of-
Screen and End-Of-Line characters as mentioned above.
ROM addresses 32, 64 ,and 255 must be reserved for test
engineering purposes. All other ROM addresses are usable,
and any that are unused must be filled with at least a
duplicate character. Any other addresses except for those
listed above should not be left blank.
DISPLAYING AN OSD IMAGE
Consecutive lines of characters make up the displayed win-
dow. These characters are stored in the page RAM through
the I
2
C compatible bus. Each line can contain any number of
characters up to the limit of the displayable line length (de-
pendent on the pixels per line register), although some re-
strictions concerning the enhanced features apply on char-
acter lines longer than 32 characters. The number of
characters across the width and height of the page can be
varied under I
2
C compatible control, but the total number of
characters that can be stored and displayed on the screen is
limited to 254 including any End-of-Line and End-of-Screen
characters. The horizontal and vertical start position can also
be programmed through the I
2
C compatible bus.
WINDOWS
Two separate windows can be opened, utilizing the data
stored in the page RAM. Each window has its own horizontal
and vertical start position, although the second window
should be horizontally spaced at least two character spaces
away from the first window, and should never overlap the
first window when both windows are on. The OSD window
must be placed within the active video.
OSD VIDEO DAC
The OSD DAC is controlled by the 9-bit (3x3 bits) OSD video
information coming from the pixel serializer look-up table.
The look-up table in the OSD palette is programmed to
select 4 color levels out of 8 linearly spaced levels per
channel. The OSD DAC is shown in
Figure 14
, where the
gain is programmable by the 2-bit OSD contrast register, in 4
stages to give the required OSD signal. The OSD DACs use
the reference voltage, V
REF
, to bias the OSD outputs.
20075727
FIGURE 13. OSD Generator Block Diagram
L
www.national.com
18
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LM1236AAA/NA 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs
LM1237 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs
LM1237_04 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs
LM1237AAF/NA 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs
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