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Active Field
BOP=1, EOP=0
BOP=0, EOP=1
BOP=0, EOP=0
BOP=0, EOP=0
BOP=1, EOP=0
BOP=0, EOP=1
Vertical
Blanking
Internal Modules
164
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
1.2.8.2.7.8 Split Lines in Line Multiplex Mode
Suppose an external device is sending two dissimilar sources in Line Multiplex mode. One narrower
source has X pixels per line. The wider source has 2X pixels per line. In an older DSP, the capture buffer
for the Super Frame must be configured to be the width of the largest incoming line. So, lines from the
narrower source would take up only half of the allocated space in the capture buffer resulting in wasted
DDR memory space.
The Meta Data has provisions for the external device to split a line. The Beginning of Line (BOL) and End
of Line (EOL) flags tag a split line as described in
Table 1-58. Split Line Table
BOL
EOL
Function
0
0
Undefined
0
1
Line Segment is the second half of a line
1
0
Line Segment is the first half of a line
1
1
Line has not been segmented into two.
1.2.8.2.7.9 Meta Data
shows the bitfields in the Meta Data start codes.
Table 1-59. Meta Data Layout
Byte
7
6
5
4
3
2
1
0
SC3
1
BOP
EOP
RSVD
CH_ID[3:0]
SC3
1
BOP
EOP
RSVD
CH_ID[3:0]
SC2
0
BOL
EOL
VDET
LINE_ID[10:7]
SC1
~LINE_ID[6]
LINE_ID[6:0]
SC0
PAD
F
V
H
P3
P2
P1
P0
BOP tags the line as a startline in a period. A period is defined as the contiguous lines in a vertical
blanking period or the contiguous lines in a field or frame. For the vertical blanking period case, the
vertical blanking at the bottom of the previous field or frame combined with the vertical blanking at the top
of the current field or frame is combined to create one period.
EOP tags the line as an endline in a period.
shows the definition of the two types of Periods
as outlined by BOP and EOP.
Figure 1-116. BOP/EOP Definition of a Period