MB87P2020 Datasheet, PDF (146/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
bits [25:24] (DEL):
DEL provides an option to shift data relative to pin VSC_VACT with up to -3 cycles.
VACT
DATA
DEL=3
Figure 3-9: DEL definitions (example: DEL=3)
VICLIMEN (402CH):
The VIC-subunit VIC_LIMIT is enabled or disabled by this switch. So a pan function can be realized. An-
other reason to enable VIC_LIMIT could be the compensation of different input sync timing. Relating con-
trol registers are VICLIMH (horizontal offset and horizontal window length [video clocks per step]) and
VICLIMV (vertical offset and vertical window length [lines per step]).
For horizontal parameters the context of input pixel per clock which depends on video colour depth and win-
dow offset/length should be considered. Since some colour formats transport less than one pixel per clock
and the offset and length is set up in clock units it is necessary to calculate the setup value depending on
colour depth. For each colour depth a factor ’f’’ for horizontal offset and length can be calculated as follows:
f = ^C-----^l-^o---^c---^k---^s-
Pixel
Registers VICLIMH_HOFF and VICLIMH_HEN have to be multiplied by ’f’. Note that for most colour for-
mats ’f’ can be set to one so that offset and length can be set directly in pixel dimensions. Table 3-3 lists all
colour formats with their factor.
Additionally some colour formats need a special alignment for horizontal offset and length. Otherwise col-
our distortions may occur. Table 3-3 gives also an overview on necessary alignments.
Table 3-3: Horizontal offset and length parameters for different colour depths
Format
Clock
Port
Factor ’f’
Alignment
YUV422
Single
Single
2
4
Double
1
2
Single
Double
1
2
RGB555
Single
Single
2
2
Double
1
1
Single
Double
1
1
YUV555
Single
Single
2
2
Double
1
1
Single
Double
1
1
RGB565
Single
Single
2
2
Double
1
1
Single
Double
1
1
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