MB87P2020 Datasheet, PDF (164/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
3.2 Merging Description Record
This record contains all data needed to convert each logical layer into intermediate and physical color space,
together with appropriate handling of Z-order.
Table 3-2: Merging Description Record.
Information
Size (bits)
1 Color Space Code
4
for intermediate color space
2 Layer to intermediate transfer codes (one per layer)
Flag to decide between two ways of transforming the layer’s logical color space
into the intermediate (common) color space. Maximal two legal ways are defined
for all combinations of logical to intermediate color space mapping (see section
2.3).
16 x 1
3 Z-order register
Contains a place for each layer concurrently displayed. This defines the Z-order,
i.e. the first place contains the number of the topmost layer, the second place the
number of the layer immediately below and so on (see fig. 3-2).
4x4
4 Plane enable
4
Flag to switch display of the respective plane on or off.
5 CLUT offsets (one per layer)
This offset is added to the pixel value when forming the address for look-up.
16 x 9
6 CLUT contents
256 x 1..24^a
512 x 1..24^b
7 Background color (confirming to intermediate color space)
The color to be displayed on locations where there is no pixel from any layer of
the video RAM. This allows to keep the visible layers as small as possible to save
RAM bandwidth yet still be able to control the appearance of the display back-
ground.
1…24
8 Background enable
1
This flag can be used to improve GPU performance when there is at least one
layer that covers the whole display area.
9 Pseudo level duty ratios
These give the values used by the duty ratio modulator to produce pseudo levels.
Since the modulator produces either 16 (4 bit to 1 conversion) or 3 x 4 (6 bit to 3
conversion) pseudo levels there is a maximum of 14 really modulated levels, two
are simply on and off level.
14 x 6
10 Pre-Matrix Biases (Jasmine only)
These values are added to Y, U, V before matrix multiplication
3x8
11 Matrix Coefficients (Jasmine only)
Factors for matrix multiplication, all treated as unsigned integer in the range of
0…2 (see 3.7.2).
9x8
12 Gamma Correction Table contents (Jasmine only)
Values used for Gamma correction after multiplication. Correction is done by
table look-up.
3 x 256 x 8
13 Gamma Table enable (Jasmine only)
1
Flag to directly map the matrix result into physical color space.
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