STV3550 datasheet(57/144 Pages) STMICROELECTRONICS

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Output Stage

STV3550

57/144

Note:

RGB to YUV conversion and color filter functions are not used in LCD applications

5.1.4

GFX_ACTIVE Signal

The chip delivers a GFX_ACTIVE signal that is high during the graphic insertion period and low

during the video period. This signal can be used to control an external switch to insert the OSD

when the video is generated externally (typically with a VGA source). Each edge of this signal can

be adjusted in timing when compared with the Hout sync pulse.

The delay is adjustable from -2 DAC_clock cycles to +5 DAC_clock cycles for the rising edge , and

from -3 DAC_clock cycles to +4 DAC_clock cycles for the falling edge, as shown in the table below.

Figure 41: Color Space Adaptor Block Diagram

Table 15: Delay on Rising/Falling Edges of GFX_ACTIVE Signal

DELAY_RISE

Delay Value

DELAY_FALL

Delay Value

0000

CSA Stage Number - 7 clock cycles

0000

CSA Stage Number - 7 clock cycles

0001

CSA Stage Number - 6 clock cycles

0001

CSA Stage Number - 6 clock cycles

0010

CSA Stage Number - 5 clock cycles

0010

CSA Stage Number - 5 clock cycles

UPSAMPLING_EN

CLK_PIX

FILTER_EN

RGB2YUV_EN

CLK_DAC

Up-sampling

COLOR_FILTER

GFX_DELAY

DELAY_RISE

DELAY_FALL

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