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AL701

QUAD Video Processor

AverLogic Technologies Inc 

AL700/701/710

BorderCenter = 0

BorderCenter = 1

Figure 10: The Effect of BorderCenter Setting

The picture can be frozen independently through controlling v1FreezeSel (#10h <1:0>),

v2FreezeSel (#11h <1:0>), v3FreezeSel (#12h <1:0>), or v4FreezeSel (#13h <1:0>).

Freeze function supports to capture a frame image, an odd field image, or an even field

image.

The image mirroring is supported in each channel at X-axis (horizontal axis) direction.

Setting v1_flipx (#10h <6>), v2_flipx (#11h <6>), v3_flipx (#12h <6>), and v4_flipx

(#13h <6>) to 1 can enable the mirror function of channel A, B, C, and D, respectively.

7.5 Video Loss

AL700/701/710 supports video loss detection in both QUAD and FULL screen display

modes. This is a very useful function in monitoring emergency situations. If there is an

interrupt event due to video loss condition and the corresponding mask is not set to 1, the

INTR pin will be active.

The video loss condition refers to the following input signals: VALID 0, VALID 1, HSYNC,

VSYNC, VCLK, DI [7:0] and Htotal_range (#0Fh <7:4>). Each signal can be enabled to

reflect the video loss condition. VLOSSSIG (#0Ch) register controls the signal enable or

disable attribute and applies the controls to all the channels. When one or more of the status

bits are set during the operation that indicates the corresponding channels lose the input

video signals.

7.6 Motion Detection

AL700/701/710 supports hardware and software motion detection function. The motion

detection function is always applied in the QUAD screen image of VCR output. The QUAD

screen image is divided into 16 equal-size windows. Each video channel is assigned 4

windows. For hardware motion detection, each window in the same channel shares the same

threshold of mean and variance defined in registers #70h~#7Fh. The motion detection

algorithm built in AL700/701/710 uses the threshold of mean and variance to automatically

©2001,2002-Copyright by AverLogic Technologies, Corp. Preliminary Version C1.1 20

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