データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LM1270N データシート(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1270N
部品情報  Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing
Download  27 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1270N データシート(HTML) 11 Page - National Semiconductor (TI)

Back Button LM1270N Datasheet HTML 7Page - National Semiconductor (TI) LM1270N Datasheet HTML 8Page - National Semiconductor (TI) LM1270N Datasheet HTML 9Page - National Semiconductor (TI) LM1270N Datasheet HTML 10Page - National Semiconductor (TI) LM1270N Datasheet HTML 11Page - National Semiconductor (TI) LM1270N Datasheet HTML 12Page - National Semiconductor (TI) LM1270N Datasheet HTML 13Page - National Semiconductor (TI) LM1270N Datasheet HTML 14Page - National Semiconductor (TI) LM1270N Datasheet HTML 15Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 27 page
background image
Video Detection (Continued)
sate for clocking delays in the timing counters in the
LM1270. This value is empirically derived from testing the
video system.
VIDEO INPUT DETECTION
The outputs of the three video detector channels are OR’d
together to provide a single composite signal of the three
channels when used for timing parameter measurement.
The video detect logic must find the extreme points of the
displayed image during each frame with respect to the hori-
zontal and vertical flyback pulses as measured using the
internal PLL. For best performance in autosizing mode, it is
recommended that the application use the maximum number
of pixels per line when measurements are made. Remem-
ber, the VCO frequency is limited to 160 MHz when the
prescaler is set to 7.
The durations to be measured are shown generically in the
figures below, and apply to both horizontal and vertical tim-
ings. For the horizontal timings the measurements will de-
pend on the mode selected in the EMPHASIS register. Ver-
tical and HFLYBACK timing measurements will be the same
in both modes.
1.
Flyback or sync period: the duration of either the sync
input or the horizontal flyback, in either horizontal lines
(vertical) or pixels (horizontal).
2.
Back porch period: the duration between the trailing
edge of the sync or flyback pulse and the leading edge
of the first detected video, in either lines (vertical) or
pixels (horizontal).
3.
Video period: the duration between the leading edge of
the first detected video and the trailing edge of the last
detected video, in either lines (vertical) or pixels (hori-
zontal).
4.
Front porch: the duration between the trailing edge of
the last detected video and the leading edge of the sync
or flyback pulse, in either lines (vertical) or pixels (hori-
zontal).
Note: In the horizontal timing measurement description, reference to sync
means either HSYNC or H_FEEDBACK, selected by WCHE bit in the
EMPHASIS register.
As the video may start and finish at different positions on the
screen, depending upon the image, the measured horizontal
porches and video time may vary from line to line. To over-
come this, the periods should be measured over at least one
entire field. The hardware records the shortest back porch
and front porch periods used over the measured period.
WINDOW COORDINATE DATA
The microcontroller must program the highlight window co-
ordinates in the LM1270 by writing to the appropriate regis-
ters. The coordinate values must be sent from the PC. For
maximum flexibility, the LM1270 is designed to allow opera-
tion such that the coordinate data may be sent by:
1.
DDC2A/B (e.g., I
2C compatible) transmission
2.
Information carried as video data during the vertical
blanking time
3.
Any other PC-monitor interface (e.g., USB)
COORDINATE DATA TRANSMISSION BY VIDEO
OPERATION
When sending coordinate data by video please refer to the
information for register 27 in the register descriptions. Any
video line may be selected for data, clock, or window. It is
important to make sure each video line has a different se-
lection otherwise the video transmission of data will not
function. It is possible to program two video channels to
carry the same information and create this incorrect opera-
tion.
If the LIMIT bit of the TEST1 register is set to a “1” (default
value), then one line of data may be transmitted after the
vertical sync on one of the video channels. This data must be
sent during the vertical blanking time that is set by the
vertical blanking register. Data must be transmitted only
during the vertical blanking time otherwise it will be ignored
by the logic. If the LIMIT bit of the TEST1 register is set to a
“0”, then the data may be transmitted at any time following
the vertical sync.
The data consists of a stream of 9 bytes. In normal use it is
expected that the first eight bytes will be data, and the
remaining byte will be used as a checksum. Alternatively, the
ninth byte may be used as an additional data byte.
Another video channel provides a clock pulse stream of
exactly 72 pulses. The logic counts the number of pulses
between two horizontal sync pulses. If the number of clock
pulses is greater or less than 72, then the data is ignored. If
the count is 72, then the data is shifted into registers 2E-36
upon arrival of the next horizontal sync, provided the output
20063521
FIGURE 4. Timing Intervals with WCHE = 1
20063522
FIGURE 5. Timing Intervals with WCHE = 0
www.national.com
11


同様の部品番号 - LM1270N

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM1276 NSC-LM1276 Datasheet
2Mb / 50P
   150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
logo
Texas Instruments
LM1276 TI1-LM1276 Datasheet
1Mb / 56P
[Old version datasheet]   Compatible RGB Preamplifier
logo
National Semiconductor ...
LM1276AAA NSC-LM1276AAA Datasheet
2Mb / 50P
   150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
LM1279 NSC-LM1279 Datasheet
533Kb / 14P
   110 MHz RGB Video Amplifier System with OSD
logo
Texas Instruments
LM1279 TI1-LM1279 Datasheet
798Kb / 20P
[Old version datasheet]   110 MHz RGB Video Amplifier System with OSD
More results

同様の説明 - LM1270N

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM1262 NSC-LM1262 Datasheet
1Mb / 20P
   200 MHz I2C Compatible RGB Video Amplifier System with OSD and DACs
LM1269 NSC-LM1269 Datasheet
1Mb / 20P
   110 MHz I2C Compatible RGB Video Amplifier System with OSD & DACs
LM1267 NSC-LM1267 Datasheet
1Mb / 20P
   150 MHz I2C Compatible RGB Video Amplifier System with OSD and DACs
logo
New Japan Radio
NJM2209 NJRC-NJM2209 Datasheet
196Kb / 4P
   VIDEO PICTURE ENHANCER
logo
Rohm
BU1570KN ROHM-BU1570KN_09 Datasheet
332Kb / 9P
   AIE: Adaptive Image Enhancer
logo
Sony Corporation
CXA1314P SONY-CXA1314P Datasheet
287Kb / 14P
   VIDEO SWITCH COMPATIBLE WITH I2C BUS
CXA1114P SONY-CXA1114P Datasheet
367Kb / 20P
   AUDIO VIDEO SWITCH COMPATIBLE WITH I2C BUS
logo
List of Unclassifed Man...
MTV030 ETC-MTV030 Datasheet
372Kb / 21P
   On-Screen Display with Auto-Sizing Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com