MCD212 datasheet(63/87 Pages) MOTOROLA

Il numero della parte	MCD212

Spiegazioni elettronici	Video Decoder and System Controller(with JTAG)

PDF	87 Pages

Scroll/Zoom	100%

Produttore elettronici	MOTOROLA [Motorola, Inc]

Homepage	http://www.freescale.com

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63 / 87 page

MCD212

8–4

MOTOROLA

Mixing is applied to image planes A and B. They are weighted and added (see Figure 8–6). The

weighting and adding is done preserving the black level (level 16):

AB = lim[ (A ) 16) * WEIGHT_A/64 + (B) 16) * WEIGHT_B/64 + 16 ]

When the result exceeds level 255, the result is fixed at 255. When the result is less than level 0, the

result is fixed at 0. Planes A and B are made transparent for overlay by making them black.

PLANE A

BLACK (16)

MUX

BL_A

WEIGHT_A

…63)

PLANE B

BLACK (16)

BL_B

MUX

DAC

CUR

CURSOR

BACKDROP

WEIGHT_B

…63)

…255)

VDSC

VSD

VSA

EXTERNAL

VIDEO

ANALOG

SWITCH

Figure 8–6. Overlay and Mixing — One Color Component

Weight factors are programmed via the weight registers. The weight factors can be dynamically

changed by the region control registers at the position they indicate.

Backdrop and cursor can be overlaid on the combined planes A and B.

During horizontal and vertical blanking of the video a constant level is set on each component.

For 50 Hz display this level is 16 and for 60 Hz display 0.

MCD212 Scheda tecnica(PDF) 63 Page - Motorola, Inc