參數(shù)資料
型號： 9402AVK
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： 14 X 14 MM, 2 MM HEIGHT, PLASTIC, MS-022, MQFP-80
文件頁數(shù)： 41/126頁
文件大?。?/td> 1673K
代理商： 9402AVK
DATA SHEET
Micronas
Aug. 16, 2004; 6251-552-1DS
21
2.4. Output Processing
2.4.1. Horizontal Postscaler
After main memory, the display processing is per-
formed using a different clock. In this way a decoupling
of input and output clocks is achieved. The conversion
to the display clock is done by an interpolation filter.
This can be used for horizontal expansion in the range
of 1...4 in steps of 2 pixels (HSCPOSC). Due to
increased clock frequency in the backend part, the
realized horizontal scaling factor depends on backend
clock frequency. Usually (36 MHz operation), the hori-
zontal expansion factors result as 0.75...16. This
ensures that the factor 0.75 gives no loss of resolution
(to show a 4:3 picture on a 16:9 tube). When using
DS656 output, neither horizontal compression nor hor-
izontal panorama is possible due to 27 MHz clock.
Because of the nonlinear characteristic and integer
number of pixel, sometimes different HSCPOSC val-
ues result in the same decimation factors.
Fig. 2–29: Expansion Factor of Horizontal Postscaler
Dependent on HSCPOSC
2.4.1.1. Panorama Mode
The picture can be geometrically distorted in horizontal
direction for an improved impression in the case of
expansions of 4:3 pictures to a 16:9 ratio tube. It is
enabled by HPANON. The idea behind this panorama
mode is to keep the middle part of the picture in a 4:3
ratio and to stretch the left and the right to fill the entire
width of the 16:9 screen. For the adjustment of the
expansion process, the picture is divided into 5 seg-
ments. For each of these segments the increment
value for the expansion factor can be defined sepa-
rately. Each end of a segment can be defined individu-
ally in a granularity of two output pixels. For every seg-
ment
an
increment
value
can
be
defined
(HINC0...HINC4) which indicates the amount of deci-
mation/expansion. One LSB is equivalent to an offset
of 0.125 to HSCPRESC per double pixel. This means
that with HINC, HSCPRESC is altered in the range
from
32...31.875 per double pixel. The segments are
distributed among the maximum number of pixels,
which is adjusted by PPLOP. The first four segments
are defined by (HSEG1...HSEG4). The last one goes
from HSEG4 to PPLOP.
Fig. 2–30: Visualization of Panorama Segments
Table 2–8: Horizontal expansion factors
HSCPOSC
Horizontal
Filter
Expansion
Overall Expansion
CLKB36=
27 MHz
CLKB36=
36 MHz
1024 (min.)
4
3
3072
1.33
1
4095
1
0.75
3
0.75
1024
4095
0
1000
2000
3000
4000
0.5
1
1.5
2
2.5
3
3.5
Horizontal Postscaler
HSCPOSC(IC)
O
veral
lExpans
io
n
HSCPOSC
(IC)
output
pixels
HSEG1
0
max.
INC_VAL
pixels
0
31.875
-32
HINC0
HSCALE
output
HSEG2
HSEG3
HSEG4
HINC1
HINC2
HINC3
HINC4
HSEG1
0
max.
HSEG2
HSEG3
HSEG4
1024
4095
3072
compression
expansion
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