VSP9435B datasheet(13/126 Pages) MICRONAS

13 / 126 page

DATA SHEET

VSP 94x2A

Micronas

Aug. 16, 2004; 6251-552-1DS

2.2. RGB Front-end

An analog RGB input port for an external RGB or YUV

source is available. The incoming signal is clamped to

the back porch by a clamping pulse. As the memory is

only able to store a 4:2:2 picture, the YUV input signal

is downconverted to 4:2:2. There are two operation

modes available. The first one uses this input as an

overlay input (soft mix). The RGB or YUV signal must

then be synchronized to the main CVBS/YC signal.

The second so called independent mode uses RGB /

YUV including sync or H/V signals. This can be used,

for example, for a DVD player or set-top-box. When

using H sync from a non CVBS input (e.g. separate H-

sync) this must be indicated by HINP. The usage of

separate V sync must be set by VINP.

The delay of luminance and fast-blank can be adjusted

by YFDEL, and chrominance can be delay adjusted by

UVDEL

. If necessary, a fine adjustment of the fast

blank can be set by the parameter FBLDEL.

Fig. 2–13: Signal and Clamping Organization

Table 2–5: Possible input signals for RGB Front-end

Input Signal

FBLIN

VIN

Sync Separation

Remark

Hinp Vinp

RGB

CVBS1)

Sync on CVBS

YUV

CVBS1)

Sync on CVBS

RGB

H1)

Sync on H

E.g. set-top-box

YUV

H1)

Sync on H

E.g. set-top-box

RGB

FBL

Synchron to CVBS/YC

Soft mix

YUV

FBL

Synchron to CVBS/YC

Soft mix

RGB (incl. sync)

Sync on G (maybe on R/B) No external sync

YUV (incl. sync)

Sync on Y

No external sync e.g. DVD 1

1) Instead of FBL input, CVBS input can be used when Hinp=0

CLAMPSIGNALS

VINP

ADC2

ADC1

ADCR

ADCG

ADCB

ADCF

from CVBS

Source select

from CVBS

Source select

from RGB

Source select

from RGB

Source select

from RGB

Source select

from RGB

Source select

DATAB

DATAF

DATAG

DATAR

Data 2

Sync

processing

ADCSEL

HINP

from VINP pin

CLAMPSIGNALS2

DCLMPF

CLMPVRB

CLMPVG

CLMPVRB

AGCADJF

AGCADJB

AGCADJG

AGCADJR

AGCADJ2

AGCADJ1

CLMPV1

256

AGCMD

R Processing

G Processing

B Processing

F Processing

to soft-mix

RBOFFSET

GOFFSET

RBOFFSET

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