CXD2467AQ Просмотр технического описания (PDF) - Sony Semiconductor

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CXD2467AQ

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD2467AQ

(i) Mute block

This block performs mute processing by replacing the video signal with data of the desired level. Of the

arithmetic coefficients set from the register, the mute data can be set independently for R, G and B, and the

initial value is 000h for each. Also, the mute processing select data is shared by R, G and B, and the initial

value is 1h. Therefore, mute is applied in the initial status. This is because the gamma block RAM output value

is undetermined in the initial status. Therefore, note that in order to output the video signal, the mute

processing select data must be set to 0h after data is set in the RAM.

Select data

Input 10

Coefficient (mute level) 10

10

Selector

Output

(j) OSD block

This block performs video signal half-tone processing and OSD-MIX processing by inputting the 2-bit OSD

data for each color and the YS and YM signals. In the initial shift block, the input data is shifted by one bit to

the LSB side when the YM signal is high level. For example, when 0F0h is input, 078h is output. Video signal

half-tone processing is performed in this manner by halving the input data level.

The selector-1 block determines the OSD level by assigning four types of coefficients with respect to the OSD

input data. In the Red block, R0D is selected and output when the OSD data is 0h, R1D when 1h, R2D when

2h, and R3D when 3h. Similarly, one of G0D, G1D, G2D or G3D is selected in the Green block, and one of

B0D, B1D, B2D or B3D in the Blue block. Next, the selector-2 block performs OSD-MIX processing by

switching the video signal and the data selected by the selector-1 block using the YS signal. Here, the

selector-1 block output data is selected and OSD-MIX processing is performed when the YS signal is high

level.

The four coefficients can be set independently for R, G and B, and the initial values are all 000h. These

coefficients are all 10 bits, and the OSD data is 2 bits for each of R, G and B, so 4 half tones can be selected

as desired from among 1024 half tones for each of R, G and B. Therefore, the desired 64 (= 26) colors can be

selected from among the total 1.07374 billion (= 230) colors for R, G and B.

OSD data

2

Coefficient (R0D) 10

Coefficient (R1D) 10

Coefficient (R2D) 10

Coefficient (R3D) 10

YS signal

YM signal

Input 10

Selector-1 10

Shift 10

Selector-2 10

Output

– 20 –

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