VPC3230D datasheet(28/78 Pages) MICRONAS

28 / 78 page

VPC 323xD, VPC 324xD

ADVANCE INFORMATION

Micronas

2.12.4. Acquisition and Display Window

The acquisition window defines the picture area of the

input active video to be displayed as a inset picture on

the screen.

The display window defines the display position of the

inset picture(s) on the screen.

The acquisition and display windows are controlled by

I2C parameters HSTR, VSTR, NPIX and NLIN (see

Fig. 2–25 and 2–26). They indicate the coordinate of

the upper-left corner and the horizontal and vertical

size of the active video area. In VPCpip or VPCsingle

mode, these four parameters define the acquisition

window in the decimated pixel grid, while in VPCmain

mode they define the display window.

Fig. 2–25: Definition of the acquisition window

Fig. 2–26: Definition of the display window

2.12.5. Frame and Background Color

Two

programmable

frame

colors

COLFR1

and

COLFR2 are available to high-light a particular inset

picture.

Instead of displaying the main picture it is possible to

fill the background with a programmable color COL-

BGD (set SHOWBGD=1 in the register PIPMODE),

e. g. for multi PIP displays on the full screen (see mode

6 and 10).

COLFR1, COLFR2 and COLBGD are 16 bits wide

each. Therefore 65536 colors are programmable.

2.12.6. Vertical Shift of the Main Picture

The VPCmain mode supports vertical up-shifting of the

main picture (e. g. letterbox format) to enable bottom

insets (see mode 11). The vertical shift is programma-

ble by VOFFSET.

2.12.7. Free Running Display Mode

In this mode a free running sync raster is generated to

guarantee a stable display in critical cases like tuner

scan. Therefore the LLC should be disabled (see

Table 2–12).

2.12.8. Frame and Field Display Mode

In frame display mode, every field is written into the

field memory. In the field display mode every second

field is written into the field memory. This configuration

is suitable for multi picture insets and freeze mode,

since it avoids motion artifacts. On the other hand, the

frame display mode guarantees maximum vertical and

temporal resolution for animated insets.

In the predefined mode the setting of frame/field mode

is done automatically to achieve the best performance.

Active Video

HSTR

VSTR

NPIX

Acquisition

Window

Active Video

HSTR

VSTR

NPIX

Display

Window

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