18-48
MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.7.5 External video signal input conditions
18.7.5.1
RTB656 YUV422 input format
The ITU R.BT-656 format is widely used for the digital transmission of NTSC and PAL signals. The
format corresponds to YUV422. Interlaced video display signals can be captured and displayed in
non-interlaced mode using linear interpolation.
If the VIE (Video Input Enable) bit of the video capture mode register (
VCM
) is 1, the capture controller
can capture video stream data from the 8 VINx_x pins in synchronization with the CCLK clock. In this
mode, only a digital video stream that conforms to the ITU-RBT656 standard can be processed. For
this reason, a Y,Cb,Cr 4:2:2 format is used to which timing reference codes are added. The video
stream is captured according to the timing reference codes; The capture controller automatically
supports both NTSC and PAL. However, in order to detect error codes, use the VS (Video Select) bit
of the
VCM
register to specify whether the input is an NTSC or PAL signal. If NTSC is set, specify the
data count in the capture data count register (CDCN). If PAL is set, specify the data count in the
capture data counter register (CDCP). If the data count does not match the data stream, then bits 4 to
bit 0 of the video capture status register (
VCS
) will contain values other than '0000'.
(1) RTB656 input format VI[7:0]
Sync code and image data (Cb,Y,Cr,Y) are input as multiples of 8 data bits in sync with a 27MHz
clock and valid pixel data is being transmitted if it is located between a SAV or EAV sync code.
SAV : Sync code for Start of Active Video data (4 Bytes)
EAV : Sync code for End of Active Video data (4 Bytes)
T : 27MHz
[ ] : 625/50 series (PAL)
SAV
EAV
Multiplexed video data
Cb,Y,Cr,Y,Cb,Y,Cr,Y,…..
8 bit
VI[7:0]
4T
H-BLANK
276T
[
288T
[
ACTIVE-VIDEO
1440T
[1440T]
EAV
4T
Blanking data
80,10,80,10,80,.
ACTIVE-VIDEO -LINE
1716T
[
1728T
[
BLANKING
PERIOD
TIMING
REF-CODE
720 PIXELS YUV4:2:2 DATA
TIMING
REF-CODE
BLANKING
PERIOD
… 80 10 FF 00 00
SAV
Cb0 Y0 Cr0 Y1 Cb2 Y2 … Cr718 Y719 FF 00 00
EAV
80 10 …
Содержание MB86R02
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