www.ti.com
3.13.5 Video Capture Channel x Field 2 Start Register (VCxSTRT2)
Video Capture Registers
Figure 3-24. Video Capture Channel x Field 1 Stop Register (VCxSTOP1)
31
28
27
16
Reserved
VCYSTOP
R-0
R/W-0
15
12
11
0
Reserved
VCXSTOP
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 3-17. Video Capture Channel x Field 1 Stop Register (VCxSTOP1) Field Descriptions
Description
Bit
field
(1)
symval
(1)
Value
BT.656 or Y/C Mode
Raw Data Mode
TCI Mode
31-28
Reserved
-
0
Reserved. The reserved bit location is always read as 0. A value written to this
field has no effect.
27-16
VCYSTOP
OF(value)
0-FFFh
Last captured line.
Upper 12 bits of the
Upper 12 bits of the
data size (in data
data size (in data
samples).
samples).
DEFAULT
0
15-12
Reserved
-
0
Reserved. The reserved bit location is always read as 0. A value written to this
field has no effect.
11-0
VCXSTOP
OF(value)
0-FFFh
Last captured pixel (VCXSTOP
Lower 12 bits of the
Lower 12 bits of the
- 1). Must be an even value
data size (in data
data size (in data
(the LSB is treated as 0).
samples).
samples).
DEFAULT
0
(1)
For CSL implementation, use the notation VP_VCxSTOP1_field_symval
The captured image is a subset of the incoming image. The video capture channel x field 2 start register
(VCASTRT2, VCBSTRT2) defines the start of the field 2 captured image. (This allows different window
alignment or size for each field.) Note that the size is defined relative to incoming data (before scaling).
In BT.656 or Y/C modes, the horizontal (pixel) counter is reset by the horizontal event (as selected by the
HRST bit in VCxCTL) and the vertical (line) counter is reset by the vertical event (as selected by the VRST
bit in VCxCTL). Field 2 capture starts when HCOUNT = VCXSTART, VCOUNT = VCYSTART, and field 2
capture is enabled.
These registers are not used in raw data mode or TCI mode because their capture sizes are completely
defined by the field 1 start and stop registers.
The video capture channel x field 2 start register (VCxSTRT2) is shown in
and described in
.
Figure 3-25. Video Capture Channel x Field 2 Start Register (VCxSTRT2)
31
28
27
16
Reserved
VCYSTART
R-0
R/W-0
15
12
11
0
Reserved
VCXSTART
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
SPRUEM1 – May 2007
Video Capture Port
77