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Video Display Registers
4.12.11 Video Display Field 2 Image Offset Register (VDIMGOFF2)
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
Table
4-16.
Figure 4-41. Video Display Field 2 Image Offset Register (VDIMGOFF2)
31
30
28
NV
Reserved
R/W-0
R-0
15
14
12
NH
Reserved
R/W-0
R-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
(1)
Bit
field
symval
31
NV
OF(value)
DEFAULT
NONE
NEGOFF
30-28 Reserved
-
27-16 IMGVOFF2
OF(value)
DEFAULT
15
NH
OF(value)
DEFAULT
NONE
NEGOFF
14-12 Reserved
-
11-0
IMGHOFF2
OF(value)
DEFAULT
(1)
For CSL implementation, use the notation VP_VDIMGOFF2_field_symval
134
Video Display Port
27
11
(1)
Value
BT.656 and Y/C Mode
Negative vertical image offset enable bit.
0
1
Display image window begins before the
first active line of field 2. (Used for VBI
data output.)
0
Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
0-FFFh
Specifies the display image vertical offset in lines from the first active line of field 2.
0
Negative horizontal image offset.
0
1
Display image window begins before the
start of active video. (Used for HANC
data output.)
0
Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
0-FFFh
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).
0
Figure 4-41
IMGVOFF2
R/W-0
IMGHOFF2
R/W-0
Description
Raw Data Mode
Not used.
Not used.
Not used.
Not used.
Specifies the display image horizontal
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and described in
16
0
SPRUEM1 – May 2007
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