DATA SHEET
VSP 94x2A
2.2. RGB Front-end
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.
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 /
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.
Table 2–5: Possible input signals for RGB Front-end
Input Signal
RGB
FBL
V
Sync Separation
Sync on CVBS
Sync on CVBS
Sync on H
Remark
Hinp Vinp
IN
IN
1)
CVBS
CVBS
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1)
YUV
1)
RGB
H
V
V
E.g. set-top-box
E.g. set-top-box
Soft mix
1)
YUV
H
Sync on H
RGB
FBL
FBL
Synchron to CVBS/YC
Synchron to CVBS/YC
YUV
Soft mix
RGB (incl. sync)
Sync on G (maybe on R/B) No external sync
Sync on Y No external sync e.g. DVD
YUV (incl. sync)
1)
Instead of FBL input, CVBS input can be used when Hinp=0
from VINP pin
AGCADJ2
Data 2
from CVBS
Source select
ADC2
ADC1
AGCADJ1
AGCMD
HINP
256
0
1
Sync
processing
from CVBS
Source select
CLMPV1
CLAMPSIGNALS
1
VINP
ADCSEL
0
1
AGCADJR
CLMPVRB
from RGB
Source select
DATAR
to soft-mix
ADCR
ADCG
ADCB
ADCF
R Processing
G Processing
B Processing
F Processing
RBOFFSET
CLAMPSIGNALS2
DATAG
AGCADJG
CLMPVG
from RGB
Source select
to soft-mix
GOFFSET
AGCADJB
CLMPVRB
from RGB
Source select
DATAB
DATAF
to soft-mix
RBOFFSET
AGCADJF
DCLMPF
from RGB
Source select
to soft-mix
Fig. 2–13: Signal and Clamping Organization
Micronas
Aug. 16, 2004; 6251-552-1DS
13
MICRONAS [ MICRONAS ]
