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

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4.12.11 Video Display Field 2 Image Offset Register (VDIMGOFF2)
Video Display Registers
The video display field 2 image offset register (VDIMGOFF2) defines the field 2 image offset and specifies
the starting location of the displayed image relative to the start of the active display.
The image line counter (ILCOUNT) is reset to 1 on the first image line (when FLCOUNT =
VBLNKYSTOP2 + IMGVOFF2). If the NV bit is set, ILCOUNT is reset to 1 when FLCOUNT =
VBLNKYSTOP2 - IMGVOFF2. Display image pixels are output in field 2 beginning on the line where
ILCOUNT = 1. The default output values or blanking values are output during active lines prior to
ILCOUNT = 1. For a negative offset, IMGVOFF2 must not be greater than VBLNKYSTOP2. The field 2
active image must not overlap the field 2 active image.
The image pixel counter (IPCOUNT) is reset to 0 at the start of an active line image. Once ILCOUNT = 1,
image pixels from the FIFO are output on each line in field 2 beginning when FPCOUNT = IMGHOFF2. If
the NH bit is set, IPCOUNT is reset when FPCOUNT = FRMWIDTH - IMGHOFF2. The default output
values or blanking values are output during active pixels prior to IMGHOFF2.
The video display field 2 image offset register (VDIMGOFF2) is shown in Figure 4-41 and described in
Table 4-16 .
Figure 4-41. Video Display Field 2 Image Offset Register (VDIMGOFF2)
31 30 28 27 16
NV Reserved IMGVOFF2
R/W-0 R-0 R/W-0
15 14 12 11 0
NH Reserved IMGHOFF2
R/W-0 R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 4-16. Video Display Field 2 Image Offset Register (VDIMGOFF2) Field Descriptions
Description
Bit field
(1)
symval
(1)
Value BT.656 and Y/C Mode Raw Data Mode
31 NV OF( value) Negative vertical image offset enable bit.
DEFAULT 0 Not used.
NONE
NEGOFF 1 Display image window begins before the Not used.
first active line of field 2. (Used for VBI
data output.)
30-28 Reserved - 0 Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
27-16 IMGVOFF2 OF( value) 0-FFFh Specifies the display image vertical offset in lines from the first active line of field 2.
DEFAULT 0
15 NH OF( value) Negative horizontal image offset.
DEFAULT 0 Not used.
NONE
NEGOFF 1 Display image window begins before the Not used.
start of active video. (Used for HANC
data output.)
14-12 Reserved - 0 Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
11-0 IMGHOFF2 OF( value) 0-FFFh Specifies the display image horizontal Specifies the display image horizontal
offset in pixels from the start of each line offset in pixels from the start of each line
of active video in field 2. This must be an of active video in field 2.
even number (the LSB is treated as 0).
DEFAULT 0
(1)
For CSL implementation, use the notation VP_VDIMGOFF2_ field_ symval
Video Display Port134 SPRUEM1 – May 2007
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