Video Port/VCXO Interpolated Control (VIC) Port User's Guide

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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_VC xSTOP1_ 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 VC xCTL) and the vertical (line) counter is reset by the vertical event (as selected by the VRST
bit in VC xCTL). 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 (VC xSTRT2) is shown in Figure 3-25 and described in
Table 3-18 .
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
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