參數(shù)資料
型號(hào)： SDA9220-5
廠商： SIEMENS A G
元件分類(lèi)： 消費(fèi)家電
英文描述： Memory Sync Controller III
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC44
文件頁(yè)數(shù)： 3/42頁(yè)
文件大?。?/td> 1474K
代理商： SDA9220-5
SDA 9220-5
Semiconductor Group
119
Detailed Circuit Description
Picture Formats
The MSC forms part of a digital television system with line-locked scanning frequency. The nominal
word rate is 13.5 MHz for luminance and 3.375 MHz for each of the U and V color components. The
active region of a TV line is identified by the high time interval of BLN. It comprises 720 pixels for
luminance and 180 pixels each for U and V and is stored in its entirety. In the 50-Hz standard a field
consists of 287.5 lines and in the 60-Hz standard of 243.5 lines.
288 lines are stored in the 50-Hz standard (lines 23-310 of the first field, lines 336-623 of the second
field) and 243 lines in the 60-Hz standard (lines 17-259 of the first field, lines 280-522 of the second
field), (
figure 1
). In the 9-image mode a field without a frame consists of 208 pixels per line for
luminance and 2 x 52 pixels per line for chrominance, with four pixels being lost for luminance and
2 x 1 for chrominance with memory or display frames. The number of lines without a frame is 84 for
the 50-Hz standard and 71 for the 60-Hz standard. Two lines less are displayed with a frame
(
figures 2 and 3
).
In the picture-in-still (PIS) and still-in-picture (SIP) modes a field without a frame or having a display
frame is of the same size as a 9-image window. With the memory frame, however, eight pixels are
lost for luminance and 2 x 2 for chrominance (
figure 4
).
For generating the windows in the modes 9-image display, PIS and SIP the picture data are filtered
horizontally and vertically in the picture processor and reduced by a factor of three.
In the zoom mode a segment of the stored picture is enlarged by a factor of two by displaying each
pixel twice as long and each line twice. The position of this picture segment is selectable.
Eight vertical and twelve horizontal positions can be set by the
I
2
C Bus (
figure 5
).
Random Interlace
The phase of VS relative to HS and the active picture content is measured at the input. At the output
VS2 is generated in the same phase relation to HS2 and the picture content. Despite the random
interlacing this means that standard picture conversion is possible without any visible interference.
Display Raster
There are three ways of displaying the field sequence: one is without interlace and two are with
interlace, i.e. with a 50-Hz or 60-Hz interlace frequency or a 100-Hz or 120-Hz interlace frequency
respectively. In what follows these are referred to symbolically as
αααα
,
ααββ
or
βαβα
. They are
produced by a suitable sequence of the vertical sync pulses VS2 for the standard-converted video
signal. The symbols
α
n
,
β
n
denote the vertical sync phases of the pulses (VS, VS2) referred to the
horizontal blanking signals (BLN, BLN2), i.e.
α
n
when the positive vertical sync edge falls within one
blanking half cycle and
β
n
when it falls within the complementary blanking half cycle.
Normally the input signal will be as follows: (
α
n–1
,
β
n–1
) (
α
n
,
β
n
) (
α
n+1
,
β
n+1
) with
α
n
and
β
n
virtually
constant.
Figures 15, 16, 17, 18 and 19
show the sequence obtained for output signal VS2 when
using one of the three operating modes.
相關(guān)PDF資料
PDF描述
SDA9251-2X 868352-Bit Dynamic Sequential Access Memory for Television Applications (TV-SAM)
SDA9253 2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM)
SDA9254-2 2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM) with On-chip Noise Reduction Filter
SDA9257 Clock Sync Generator
SDA9280 ICs for Consumer Electronics
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SDA9251-2X 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:868352-Bit Dynamic Sequential Access Memory for Television Applications (TV-SAM)
SDA9253 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM)
SDA9254-2 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM) with On-chip Noise Reduction Filter
SDA9255 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:SRC-Scan Rate Converter SDA9255
SDA9257 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:Clock Sync Generator
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