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Fabricante

AL701

QUAD Video Processor

AverLogic Technologies Inc 

AL700/701/710

A

B

A

C

D

QUAD Screen

Full Screen

Figure 7: QUAD and Full Screen Display

Each channel can be located in any one position of left-top, left-bottom, right-top, and

right-bottom screen in PIP (Picture In Picture) display mode. AL700/701/710 provides

two-layer effect on picture layer priority. The bottom layer is always chosen as base video

and the top layer shows the sub video window in PIP mode. These effects are defined by

MTROUTSEL (#19h) and PIPCTRL (#1Ah) registers.

Left-

Top

Right-

Top

Left- Right-

Bottom Bottom

Bottom Layer

Top

Layer

Picture Position

Picture Layer Priority

Figure 8: Picture Position and Picture Layer

By setting up data in MTROUTSEL (#19h) and PIPCTRL (#1Ah) registers, you can get

various useful features like PIP, channel overlay, sequential scan picture, anti-rolling

switching channel, 1 to 4 picture display, and so on.

7.4.2 Display Attributes

Display control will affect all channels at the same time. These controls include NTSC or

PAL/SECAM system selection, background and full screen borderline color selection,

and full screen borderline display/blink enable or disable.

AL700/701/710 supports 525-line system in NTSC and 625-line system in PAL/SECAM.

The Vsystem in SYSCONFIG register (#03h <0>) defines the video system.

The background area is defined as outside of all active picture region. The background

color is defined in BGColor (#20h <1:0>) and has four 24-bit color choices. The selected

colors are defined in color Look Up Table (LUT).

The full screen borderline color is defined in Border5_color (#14h <3:2>) and can be one

of color 0, color 1, color 2, and color 3 defined in color LUT. No matter what channel is

displayed in full screen, the full screen borderline color and blink attribute are the same.

For the full screen display, it has its own control attributes to enable/disable or blink the

©2001,2002-Copyright by AverLogic Technologies, Corp. Preliminary Version C1.1 18

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